Welcome to Functional Electronic Materials
In the Division of Functional Electronic Materials, we conduct scientific research on electronic, magnetic and photonic semiconductor materials and nanostructures. The materials systems currently under study include novel spintronic materials, advanced electronic and photonic materials based on wide bandgap semiconductors and highly mismatched semiconductors, and semiconductor nanostructures.
The research is carried out mostly through a close collaboration with many groups worldwide. Our aim is to obtain a better understanding of fundamental physical properties and a good control of materials properties, and to fully explore functionality of the studied materials for applications in future generation micro- and nano-electronics and photonics as well as in potential multifunctional devices and systems.
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Efficient room-temperature nuclear spin hyperpolarization of defect atom in a semiconductor
Yuttapoom Puttisong, Xingjun Wang, Irina A. Buyanova, L. Geelhaar, H. Riechert, A. J. Ptak, C. W. Tu and Weimin. M. Chen

Nuclear spin hyperpolarization is essential to future solid-state quantum computation using nuclear spin qubits and in highly sensitive magnetic resonance imaging. Though efficient dynamic nuclear polarization in semiconductors has been demonstrated at low temperatures for decades, its realization at room temperature is largely lacking. Here we demonstrate that a combined effect of efficient spin-dependent recombination and hyperfine coupling can facilitate strong dynamic nuclear polarization of a defect atom in a semiconductor at room temperature. We provide direct evidence that a sizeable nuclear field (~150 Gauss) and nuclear spin polarization (~15%) sensed by conduction electrons in GaNAs originates from dynamic nuclear polarization of a Ga interstitial defect. We further show that the dynamic nuclear polarization process is remarkably fast and is completed in <5 μs at room temperature. The proposed new concept could pave a way to overcome a major obstacle in achieving strong dynamic nuclear polarization at room temperature, desirable for practical device applications.
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Media interest:
“Ett steg närmare kvantdatorn”, by Monica Westman Svenselius, LiU Nyheter, 2013-04-26
“One step closer to a quantum computer”, by Monica Westman Svenselius, LiU Nyheter, 2013-04-26
“One Step Closer to a Quantum Computer”, Science Daily, April 30 2013
“Success in initializing and reading nuclear spins brings quantum computer a step closer”, PhysOrg, April 30 2013.
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Room-temperature electron spin amplifier based on Ga(In)NAs alloys
Yuttapoom Puttisong, Irina A. Buyanova, A. J. Ptak, C. W. Tu, L. Geelhaar, H. Riechert and Weimin M. Chen
The first experimental demonstration of a spin amplifier at room temperature is presented. An efficient, defect-enabled spin amplifier based on a non-magnetic semiconductor, Ga(In)NAs, is proposed and demonstrated, with a large spin gain (up to 2700% at zero field) for conduction electrons and a high cut-off frequency up to 1 GHz.
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Media interest:
“Viktigt framsteg inom spinntronik”, by Åke Hjelm, LiU Nyheter, Nov.15 2012
“Important advance for spintronics”, by Åke Hjelm, LiU Nyheter, Nov.15 2012
“Första spinnförstärkaren i rumstemperatur”, by Charlotta von Schultz, NyTeknik, 14 november 2012.
”Genombrott: spinnförstärkare i rumstemperatur”, by Jan Tångring, Elektronik Tidningen, Nov.14 2012
“Important Progress for Spintronics: Spin Amplifier Works at Room Temperature”, ScienceDaily (Nov. 16, 2012)
“Important progress for spintronics: A spin amplifier to be used in room temperature”, PhysOrg (Nov.16 201)
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Handbook of Spintronic Semiconductors
edited by Weimin M Chen and Irina A Buyanova
Published in Spring 2010 by Pan Stanford Publishing. 400 pages (approx.) ISBN 978-981-4267-36-6
More...
Spintronics explores the spin degree of freedom of the electron to sense, store, process and transfer information in addition to the electron charge. Semiconductor spintronics promises to combine new spin enabling functionality with the present-day microelectronics and optoelectronics. It also opens the door to new generation of devices, and to the merging of electronics, photonics and magnetics. The success of spintronics relies on our ability to create and control spins. Among many obstacles, generation of electron spin polarization and coherence at room temperature is one of the most important as well as the most challenging issues, which has attracted intense research efforts during recent years. Significant progresses have been made both theoretically and experimentally, while many issues remain unresolved.
This book provides an in-depth review of the rapidly developing field of spintronic semiconductors. It covers a broad range of topics, including growth and basic physical properties of diluted magnetic semiconductors based on II-VI, III-V and IV semiconductors, recent developments in theory and experimental techniques and potential device applications; its aim is to provide postgraduate students, researchers and engineers a comprehensive overview of our present knowledge and future perspectives of spintronic semiconductors.
See the flyer or the publisher's website for more information.
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Room-temperature defect-engineered spin filter based on a non-magnetic semiconductor
Xingjun J. Wang, Irina A. Buyanova, F. Zhao, D. Lagarde, A. Balocchi, X. Marie, C. W. Tu, J. C. Harmand and Weimin M. Chen

More...
Generating, manipulating and detecting electron spin polarization and coherence at room temperature is at the heart of
future spintronics and spin-based quantum information technology. Spin filtering, which is a key issue for spintronic
applications, has been demonstrated by using ferromagnetic metals, diluted magnetic semiconductors,
quantum point contacts, quantum dots, carbon nanotubes, multiferroics and so on.
This filtering effect was so far restricted to a limited efficiency and primarily at low temperatures or under a
magnetic field. Here, we provide direct and unambiguous experimental proof that an electron-spin-polarized defect,
such as a Gai self-interstitial in dilute nitride GaNAs, can effectively deplete conduction electrons with an opposite
spin orientation and can thus turn the non-magnetic semiconductor into an efficient spin filter operating at room
temperature and zero magnetic field. This work shows the potential of such defect-engineered, switchable spin
filters as an attractive alternative to generate, amplify and detect electron spin polarization at room temperature
without a magnetic material or external magnetic fields.
LiU E-Press offers a free parallel publication.
En översikt på svenska finns i LiUs nyhets-arkiv.
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Media interest:
“Filter gör spinntroniken användbar”, by Hanna Meerveld, Naturvetarna, May 4 2009
“Elektroner spinner i takt i Linköping”, by Anna Wennberg, Elektronik Tidningen, Feb.16 2009
“Stort framsteg för spinntroniken”, by Åke Hjelm, LiU Nyheter, Feb.17 2009
“Great progress for spintronics”, Swedish Research, March 4, 2009
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Dynamics of donor bound excitons in ZnO
Shula Chen, Weimin M. Chen and Irina A. Buyanova
Abstract...
Comprehensive time-resolved photoluminescence measurements are performed on shallow neutral donor bound excitons (D0Xs) in bulk ZnO. It is found that transients of the no-phonon D0X transitions (I6-I9 lines) are largely affected by excitation conditions and change from a bi-exponential decay with characteristic fast (τf) and slow (τs) time constants under above-bandgap excitation to a single exponential one, determined by τs, under two-photon excitation. The slow decay also dominates transients of longitudinal optical phonon-assisted and two-electron-satellite D0X transitions, and is attributed to “bulk” D0X lifetime. The fast component is tentatively suggested to represent effects of surface recombination.
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Defects in N, O and N, Zn implanted ZnO bulk crystals
Jan Stehr , Xingjun Wang , Stanislav Filippo v, S. J. Pearton , I. G. Ivanov , Weimin M. Chen , and Irina A. Buyanova

Abstract...
Comprehensive characterization of defects formed in bulk ZnO single crystals co-implanted with N and Zn as well as N and O atoms is performed by means of optically detected magnetic resonance (ODMR) complemented by Raman and photoluminescence (PL) spectroscopies. It is shown that in addition to intrinsic defects such as Zn vacancies and Zn interstitials, several N-related defects are formed in the implanted ZnO. The prevailed configuration of the defects is found to depend on the choices of the co-implants and also the chosen annealing ambient. Specifically, co-implantation with O leads to the formation of (i) defects responsible for local vibrational modes at 277, 511, and 581 cm−1; (ii) a N-related acceptor with the binding energy of 160 ± 40 meV that is involved in the donor-acceptor pair emission at 3.23 eV; and (iii) a deep donor and a deep NO acceptor revealed from ODMR. Activation of the latter defects is found to require post-implantation annealing in nitrogen ambient. None of these defects are detected when N is co-implanted with Zn. Under these conditions, the dominant N-induced defects include a deep center responsible for the 3.3128 eV PL line, as well as an acceptor center of unknown origin revealed by ODMR. Formation mechanisms of the studied defects and their role in carrier recombination are discussed.
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Effect of hyperfine-induced spin mixing on the defect-enabled spin blockade and spin filtering in GaNAs
Yuttapoom Puttisong, Xingjun Wang, Irina A. Buyanova and Weimin M. Chen
Abstract...
The effect of hyperfine interaction (HFI) on the recently discovered room-temperature defect-enabled spin-filtering effect in GaNAs alloys is investigated both experimentally and theoretically based on a spin Hamiltonian analysis. We provide direct experimental evidence that the HFI between the electron and nuclear spin of the central Ga atom of the spin-filtering defect, namely, the Gai interstitials, causes strong mixing of the electron spin states of the defect, thereby degrading the efficiency of the spin-filtering effect. We also show that the HFI-induced spin mixing can be suppressed by an application of a longitudinal magnetic field such that the electronic Zeeman interaction overcomes the HFI, leading to well-defined electron spin states beneficial to the spin-filtering effect. The results provide a guideline for further optimization of the defect-engineered spin-filtering effect.
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Optically detected magnetic resonance studies of point defects in quaternary GaNAsP epilayers grown by vapor phase epitaxy
Daniel Dagnelund , Jan Stehr , A. Yu. Egorov , Weimin M. Chen , and Irina A. Buyanova
Abstract...
Defect properties of quaternary GaNAsP/GaP epilayers grown by vapor phase epitaxy (VPE) are studied by photoluminescence and optically detected magnetic resonance techniques. Incorporation of more than 0.6% of nitrogen is found to facilitate formation of several paramagnetic defects which act as competing carrier recombination centers. One of the defects (labeled as Gai-D) is identified as a complex defect that has a Ga interstitial (Gai) atom residing inside a Ga tetrahedron as its core. A comparison of Gai-D with other Gai-related defects known in ternary GaNP and GaNAs alloys suggests that this defect configuration is specific to VPE-grown dilute nitrides.
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Zeeman splitting and dynamics of an isoelectronic bound exciton near the band edge of ZnO
The first detailed study of an exciton bound to an isoelectronic center
Shula Chen, Weimin M. Chen and Irina A. Buyanova
Abstract...
Comprehensive time-resolved photoluminescence and magneto-optical measurements are performed on a bound exciton (BX) line peaking at 3.3621 eV (labeled as I*). Though the energy position of I* lies within the same energy range as that for donor bound exciton (DX) transitions, its behavior in an applied magnetic field is found to be distinctly different from that observed for DXs bound to either ionized or neutral donors. An exciton bound to an isoelectronic center with a hole-attractive local potential is shown to provide a satisfactory model that can account for all experimental results of the I* transition.
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Defect properties of ZnO nanowires revealed from an optically detected magnetic resonance study
Jan E. Stehr, Shula Chen, Stanislav Filippov, M. Devika, N. Koteeswara Reddy, C. W. Tu, Weimin M. Chen and Irina A. Buyanova
Abstract...
Optically detected magnetic resonance is employed to identify key factors governing dynamic nuclear polarization (DNP) in a semiconductor. We demonstrate that the extent of DNP can be efficiently controlled by varying lifetime of the localized electrons that transfer spin angular momentum to nuclei. The ultimate speed of a DNP process, on the other hand, is determined by the strength of hyperfine interaction that drives DNP. We show that about 50% nuclear spin polarization of a PIn antisite in InP can be achieved by shortening electron lifetime within a remarkably short time (<0.1 ms) due to strong hyperfine coupling.
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Sub-millisecond dynamic nuclear spin hyperpolarization in a semiconductor: A case study from PIn antisite in InP
Xingjun Wang, Irina A. Buyanova and Weimin Chen
Abstract...
Optically detected magnetic resonance is employed to identify key factors governing dynamic nuclear polarization (DNP) in a semiconductor. We demonstrate that the extent of DNP can be efficiently controlled by varying lifetime of the localized electrons that transfer spin angular momentum to nuclei. The ultimate speed of a DNP process, on the other hand, is determined by the strength of hyperfine interaction that drives DNP. We show that about 50% nuclear spin polarization of a PIn antisite in InP can be achieved by shortening electron lifetime within a remarkably short time (<0.1 ms) due to strong hyperfine coupling.
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Mechanism for radiative recombination and defect properties of GaP/GaNP core/shell nanowires
Alexander Dobrovolsky , Jan Stehr , Shula Chen , Y. J. Kuang , S. Sukrittanon , C. W. Tu , Weimin M. Chen , and Irina A. Buyanova
Abstract...
Recombination processes in GaP/GaNP core/shell nanowires (NWs) grown on a Si substrate by molecular beam epitaxy are examined using a variety of optical characterization techniques, including cw- and time-resolved photoluminescence and optically detected magnetic resonance (ODMR). Superior optical quality of the structures is demonstrated based on the observation of intense emission from a single NW at room temperature. This emission is shown to originate from radiative transitions within N-related localized states. From ODMR, growth of GaP/GaNP NWs is also found to facilitate formation of complex defects containing a P atom at its core that act as centers of competing non-radiative recombination.
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Evidence for coupling between exciton emissions and surface plasmon in Ni-coated ZnO nanowires
Qejun Ren, Stanislav Filippov, Shula Chen, M. Devika, N. Koteeswara Reddy, C. W. Tu, Weimin M. Chen and Irina A. Buyanova
Surface plasmons are used to enhance light emission from ZnO/transition metal core/shell nanowires

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Abstract...
We show that coating ZnO nanowires (NWs) with a transition metal, such as Ni, can increase the efficiency of light emission at room temperature. Based on detailed structural and optical studies, this enhancement is attributed to energy transfer between near-band-edge emission in ZnO and surface plasmons in the Ni film which leads to an increased rate of the spontaneous emission. It is also shown that the Ni coating leads to an enhanced non-radiative recombination via surface states, which becomes increasingly important at low measurement temperatures and in annealed ZnO/Ni NWs.
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Efficient upconversion of photoluminescence via two-photon absorption in bulk and nanorod ZnO
Shula Chen, Jan Stehr, N. Koteeswara Reddy, C. W. Tu, Weimin M. Chen and Irina A. Buyanova
Deeper understanding of different up-conversion mechanisms in ZnO

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Abstract...
Efficient upconversion of photoluminescence from donor-bound excitons is revealed in bulk and nanorod ZnO. Based on excitation power-dependent PL measurements performed with different energies of excitation photons, two-photon absorption (TPA) and two-step TPA (TS-TPA) processes are concluded to be responsible for the upconversion. The TS-TPA process is found to occur via a defect/impurity (or defects/impurities) with an energy level (or levels) lying within 1.14–1.56 eV from one of the band edges, without involving photon recycling. One of the possible defect candidates could be VZn. A sharp energy threshold, different from that for the corresponding one-photon absorption, is observed for the TPA process and is explained in terms of selection rules for the involved optical transitions.
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Long delays of light in ZnO caused by exciton-polariton propagation
Shula chen, Weimin M. Chen and Irina A. Buyanova

This article has been selected as Editor Choice in Physica Status Solidi b : basic solid state physics with a back cover page of this journal in volume 249, issue 7, July 2012
Abstract...
We study the propagation of exciton-polaritons through bulk ZnO using time-resolved photoluminescence (PL) complemented by time-of-flight measurements of laser pulses. When the photon energy approaches donor bound exciton resonances, substantial time delays in PL light propagation are observed which reach up to 210 ps for a 0.55 mm thick crystal. By comparing results from time-of-flight measurements performed using PL light and laser pulses, the observed delay is shown to be due to the formation of exciton-polaritons and their spectral dispersion. It is also shown that the main contribution to the slow-down effect arises from free exciton-polaritons, whereas bound exciton-polaritons become important only in close vicinity to the corresponding resonances.
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Antiferromagnetic interaction in coupled CdSe/ZnMnSe quantum dot structures
Daniel Dagnelund, Q. J. Ren, Irina A. Buyanova, A. Murayama, and Weimin M. Chen
Uncover the exact mechanism for magnetic coupling in QD structures
Abstract...
Spin polarization of nonmagnetic CdSe quantum dots (QDs) coupled to adjacent ZnMnSe diluted magnetic semiconductor (DMS) is investigated by CW and time-resolved magneto-optical spectroscopy under tunable laser excitation. Efficient enhancement in the degree of σ− circular polarization of photoluminescence from the CdSe QDs is observed under optical excitation at the σ+-active exciton state of the DMS. The fact that the enhancement persists much longer than the exciton lifetime of the DMS rules out a role of the DMS excitons. A possible explanation is discussed in terms of antiferromagnetic coupling between the excitons in QDs and aligned Mn ions in DMS.
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Temperature dependence of dynamic nuclear polarization and its effect on electron spin relaxation and dephasing in InAs/GaAs quantum dots
Jan Beyer, Yuttapoom Puttisong, Irina A. Buyanova, S. Suraprapapich, C. W. Tu, and Weimin M. Chen
Towards identification of the dominant electron spin relaxation process at elevated temperatures

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Abstract...
Electron spin dephasing and relaxation due to hyperfine interaction with nuclear spins is studied in an InAs/GaAs quantum dot ensemble as a function of temperature up to 85 K, in an applied longitudinal magnetic field. The extent of hyperfine-induced dephasing is found to decrease, whereas dynamic nuclear polarization increases with increasing temperature. We attribute both effects to an accelerating electron spin relaxation through phonon-assisted electron-nuclear spin flip-flops driven by hyperfine interactions, which could become the dominating contribution to electron spin depolarization at high temperatures.
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The Hanle effect and electron spin polarization in InAs/GaAs quantum dots up to room temperature
Jan Beyer , Irina A. Buyanova , S. Suraprapapich , C. W. Tu and Weimin M Chen
What determine spin polarization at room temperature

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Abstract...
The Hanle effect in InAs/GaAs quantum dots (QDs) is studied under optical orientation as a function of temperature over the range of 150–300 K, with the aim of understanding the physical mechanism responsible for the observed sharp increase of electron spin polarization with increasing temperature. The deduced spin lifetime Ts of positive trions in the QDs is found to be independent of temperature, and is also insensitive to excitation energy and density. It is argued that the measured Ts is mainly determined by the longitudinal spin-flip time (T1) and the spin dephasing time (T2*) of the studied QD ensemble, of which both are temperature independent over the studied temperature range and the latter makes a larger contribution. The observed sharply rising QD spin polarization degree with increasing temperature, on the other hand, is shown to be induced by an increase in spin injection efficiency from the barrier/wetting layer and also by a moderate increase in spin detection efficiency of the QD.
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Effects of a longitudinal magnetic field on spin injection and detection in InAs/GaAs quantum dot structures
Jan Beyer , P. H. Wang , Irina A. Buyanova , S. Suraprapapich , C. W. Tu and Weimin M. Chen
Revealing the factors limiting spin injection and spin detection efficiency

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This paper has been selected as an invited IOP journal highlights article in 2012
Abstract...
Effects of a longitudinal magnetic field on optical spin injection and detection in InAs/GaAs quantum dot (QD) structures are investigated by optical orientation spectroscopy. An increase in the optical and spin polarization of the QDs is observed with increasing magnetic field in the range 0–2 T, and is attributed to suppression of exciton spin depolarization within the QDs that is promoted by the hyperfine interaction and anisotropic electron–hole exchange interaction. This leads to a corresponding enhancement in spin detection efficiency of the QDs by a factor of up to 2.5. At higher magnetic fields, when these spin depolarization processes are quenched, the electron spin polarization in anisotropic QD structures (such as double QDs that are preferably aligned along a specific crystallographic axis) still exhibits a rather strong field dependence under non-resonant excitation. In contrast, such a field dependence is practically absent in more 'isotropic' QD structures (e.g. single QDs). We attribute the observed effect to stronger electron spin relaxation in the spin injectors (i.e. wetting layer and GaAs barriers) of the lower-symmetry QD structures, which also explains the lower spin injection efficiency observed in these structures.
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Effects of P implantation and post-implantation annealing on defect formation in ZnO
Xingjun Wang, Weimin M. Chen, F. Ren, S. Pearton, and Irina A. Buyanova
Identification of dominant defects and their role in materials properties

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Abstract...
Photoluminescence (PL) and optically detected magnetic resonance (ODMR) techniques are utilized to examine the effects of P implantation and post-implantation annealing on defect formation in ZnO single crystals. From ODMR, the main defects created by ion implantation include oxygen and zinc vacancies as a well as a deep donor labeled as PD. The formation of the PD defect is likely promoted by the presence of P as it could only be detected in the P-containing ZnO. The VO and PD centers are found to exhibit low thermal stability and can be annealed out at 800 °C. On the other hand, a new set of defects, such as Z, T, and D* centers, is detected after annealing. Based on measured spectral dependences of the ODMR signals, the VO, VZn, and PD centers are shown to participate in spin-dependent recombination processes related to red emissions, whereas the Z, T, and D* centers are involved in radiative recombination over a wide spectral range of 1.55–2.5 eV. From the PL measurements, combined effects of implantation and annealing also lead to appearance of a new PL band peaking at ∼3.156 eV, likely due to donor-acceptor-pair recombination. The formation of the involved deep acceptor is concluded to be facilitated by the presence of P.
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Efficient room-temperature spin detector based on GaNAs
Yuttapoom Puttisong, Irina A. Buyanova, L. Geelhaar, H. Riechert, C. W. Tu, and Weimin M. Chen
Most efficient room-temperature spin detector to date

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Abstract...
Efficient and highly spin-dependent recombination processes are shown to not only turn GaNAs into an efficient spin filter but also to make it an excellent spin detector functional at room temperature (RT). By taking advantage of the defect-engineered spin-filtering effect, the spin detection efficiency is no longer limited by the fast spin relaxation of conduction electrons. This leads to a significant enhancement in the optical polarization of the spin detector, making it possible to reliably detect even very weak electron spin polarization at RT, as demonstrated by a study of spin loss during optical spin injection across a GaAs/GaNAs interface.
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Effects of hydrogenation on non-radiative defects in GaNP and GaNAs alloys: An optically detected magnetic resonance study
Daniel Dagnelund, I. P. Vorona, G. Nosenko, Xingjun Wang, C. W. Tu, H. Yonezu, A. Polimeni, M. Capizzi, Weimin M. Chen, and Irina A Buyanova
Remarkable and surprising difference revealed between GaNP and GaNAs

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Abstract...
Photoluminescence and optically detected magnetic resonance techniques are utilized to study defect properties of GaNP and GaNAs alloys subjected to post-growth hydrogenation by low-energy sub-threshold ion beam irradiation. It is found that in GaNP H incorporation leads to activation of new defects, which has a Ga interstitial (Gai) atom at its core and may also involve a H atom as a partner. The observed activation critically depends on the presence of N in the alloy, as it does not occur in GaP with a low level of N doping. In sharp contrast, in GaNAs hydrogen is found to efficiently passivate Gai-related defects present in the as-grown material. A possible mechanism responsible for the observed difference in the H behavior in GaNP and GaNAs is discussed.
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Room temperature spin filtering effect in GaNAs: Role of hydrogen
Yuttapoom Puttisong, Daniel Dagnelund, Irina A. Buyanova, C. W. Tu, A. Polimeni, M. Capizzi, and Weimin M. Chen
H is no good for defect-engineered spin filtering.

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Abstract...
Effects of hydrogen on the recently discovered defect-engineered spin filtering in GaNAs are investigated by optical spin orientation and optically detected magnetic resonance. Post-growth hydrogen treatments are shown to lead to nearly complete quenching of the room-temperature spin-filtering effect in both GaNAs epilayers and GaNAs/GaAs multiple quantum wells, accompanied by a reduction in concentrations of Gai interstitial defects. Our finding provides strong evidence for efficient hydrogen passivation of these spin-filtering defects, likely via formation of complexes between Gai defects and hydrogen, as being responsible for the observed strong suppression of the spin-filtering effect after the hydrogen treatments.
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Slowdown of light due to exciton-polariton propagation in ZnO
Shula Chen, Weimin M. Chen, and Irina A. Buyanova
When light has speed of 2044 km/s!!

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Abstract...
By employing time-of-flight spectroscopy, the group velocity of light propagating through bulk ZnO is demonstrated to dramatically decrease down to 2044 km/s when photon energy approaches the absorption edge of the material. The magnitude of this decrease is found to depend on light polarization. It is concluded that even though the slowdown is observed in the vicinity of donor bound exciton (BX) resonances, the effect is chiefly governed by dispersion of free exciton (FX) polaritons that propagate coherently via ballistic transport. Based on the experimentally determined spectral dependence of the polariton group velocity, the polariton dispersion is accurately determined.
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Strong room-temperature optical and spin polarization in InAs/GaAs quantum dot structures
Jan Beyer , Irina A. Buyanova , S. Suraprapapich , C. W. Tu and Weimin M. Chen
the highly anticipated capability as highly polarized spin/light sources and efficient spin detectors finally demonstrated

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Abstract...
Room-temperature optical and spin polarization up to 35% is reported in InAs/GaAs quantum dots in zero magnetic field under optical spin injection using continuous-wave optical orientation spectroscopy. The observed strong spin polarization is suggested to be facilitated by a shortened trion lifetime, which constrains electron spin relaxation. Our finding provides experimental demonstration of the highly anticipated capability of semiconductor quantum dots as highly polarized spin/light sources and efficient spin detectors, with efficiency greater than 35% in the studied quantum dots.
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Effect of postgrowth hydrogen treatment in defects in GaNP
Daniel Dagnelund , Xingjun J. Wang , C. W. Tu , A. Polimeni , M. Capizzi , Weimin M. Chen and Irina A. Buyanova
Anomalous effect of hydrogen treatment in a semiconductor: activation of defects in GaNP

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Abstract...
Effect of postgrowth hydrogen treatment on defects and their role in carrier recombination in GaNP alloys is examined by photoluminescence (PL) and optically detected magnetic resonance. We present direct experimental evidence for effective activation of several defects by low-energy subthreshold hydrogen treatment (andlt;= 100 eV H ions). Among them, two defect complexes are identified to contain a Ga interstitial. Possible mechanisms for the H-induced defect activation and creation are discussed. Carrier recombination via these defects is shown to efficiently compete with the near band-edge PL, explaining the observed degraded optical quality of the alloys after the H treatment.
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Quantifying efficiency of room-temperature spin injection and spin loss across a GaNAs/GaAs interface
Yuttapoom Puttisong , Xingjun J. Wang , Irina A. Buyanova , C. W. Tu , L. Geelhaar , H. Riechert and Weimin M. Chen
The first case for a semiconductor heterointerface

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Abstract...
Recently discovered effect of spin-filtering and spin amplification in GaNAs enables us to reliably obtain detailed information on the degree of spin loss during optical spin injection across a semiconductor heterointerface at room temperature. Spin polarization of electrons injected from GaAs into GaNAs is found to be less than half of what is generated in GaNAs by optical orientation. We show that the observed reduced spin injection efficiency is not only due to spin relaxation in GaAs, but more importantly due to spin loss across the interface due to structural inversion asymmetry and probably also interfacial point defects.
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Oxygen and zinc vacancies in as-grown ZnO single crystals
Xingjun J. Wang, Leonid S. Vlasenko, S. J. Pearton, Weimin M. Chen and Irina A. Buyanova

This article has been selected as one of 31 articles in all fields (and one of 6 in the
category STRUCTURE AND PROPERTIES OF MATTER) in the Journal of
Physics D Highlights of 2009 collection.
abstract...
Oxygen and zinc vacancies are unambiguously shown to be formed in as-grown ZnO bulk crystals grown from
melt without being subjected to irradiation, from electron paramagnetic resonance (EPR) and optically detected magnetic
resonance (ODMR) studies. Concentrations of the defects in their paramagnetic charge states and are estimated to be
~2 × 1014 cm−3 and ~1015 cm−3, respectively. The defect is
concluded to act as a deep acceptor and to exhibit large Jahn–Teller distortion by 0.8 eV. The energy level of the defect
corresponding to the (2–/–) transition is Ev + 1.0 eV. The isolated Zn vacancy is found to be an
important recombination centre and is concluded to be responsible for the red luminescence centred at around 1.6 eV.
On the other hand, the oxygen vacancy seems to be less important in carrier recombination as it could be detected
only in EPR but not in ODMR measurements. Neither isolated nor centres participate in the so-called 'green' emission. It
is also shown that whereas the concentrations of both defects can be reduced by post-growth annealing, the Zn
vacancy exhibits higher thermal stability. The important role of residual contaminants such as Li in the annealing
process is underlined.
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Spin injection in lateral InAs quantum dot structures by optical orientation spectroscopy
Jan Beyer, Irina A. Buyanova, S. Suraprapapich, C. W. Tu and Weimin M. Chen
This paper was selected as an invited journal highlights article on nanotechweb.org. abstract...
Optical spin injection is studied in novel laterally-arranged self-assembled InAs/GaAs quantum dot structures, by using optical orientation measurements in combination with tunable laser spectroscopy. It is shown that spins of uncorrelated free carriers are better conserved during the spin injection than the spins of correlated electrons and holes in an exciton. This is attributed to efficient spin relaxation promoted by the electron–hole exchange interaction of the excitons. Our finding suggests that separate carrier injection, such as that employed in electrical spin injection devices, can be advantageous for spin conserving injection. It is also found that the spin injection efficiency decreases for free carriers with high momentum, due to the acceleration of spin relaxation processes.
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