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Dielectric properties of low dimensional structures - piezoelectricity nanomaterials

Supervisor: Ferenc Tasnádi
Level: Master
Prerequisites: Solid State Physics, Statistical Thermodynamics

Piezoelectricity is a more than 100 years old phenomenon but still has a remarkable impact on our modern everyday life. Piezoelectric devices are used in everyday objects such as mobile-phones, touch-sensitive elevator buttons, GPS, bluetooth etc. Industry consumes more than 3 billion piezoelectric sensors per year. Modern piezoelectric technology is targeting the development novel functional materials. Alloying of two or more piezoelectric materials can lead to anomalous piezoelectric response. Accurate theoretical treatment of piezoelectricity become possible only with the fascinating modern geometric Berry-Phase approach. Microscopic modeling of tensorial quantities in disordered alloys, such as the piezoelectricity, is among the hot topics in theoretical alloy physics.

You can expect during this project: a strengthening of your knowledge in solid states physics; an overview and routine in using sophisticated program packages on supercomputers; an understanding of the theory of Berry-phase and polarisation in crystals together with the tensorial representation of inhomogeneous materials properties.

1a) The effect of in-plan strain on the piezoelectric response of multilayered nitride alloys.
1b) Dynamical simulations on the temperature dependence of the piezoelectric response in wurtzite binary materials (AlN, GaN, InN).
1c) Elastic and piezoelectric properties of nanowires: binary InN, GaN, AlN and
their alloys.

[1] F. Tasnádi et al., Phys. Rev. Lett. 104, 137601 (2010).
[2] G. Wingqvist et al., Appl. Phys. Lett. 97, 11 (2010).
[3] C. Tholander et al., Phys. Rev. B 87, 094107 (2013).

Responsible for this page: Fei Wang

Last updated: 03/13/15