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TU Dresden » Faculty of Mechanical Science and Engineering » Institute for Materials Science » Chair of Materials Science and Nanotechnology

Friday, 30 November 2012
(at 13:00 in room 115, Hallwachsstr. 3)
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Thermoelectric transport in semiconducting heterostructures

Nicki Frank Hinsche

Institute of physics - Theoretical physics, Martin-Luther-University Halle-Wittenberg Halle/Saale

Solid-state thermoelectric power generation is increasingly being seen as having potential in efficient waste-heat recovery and with that to provide alternative and cleaner forms of energy [1]. Bi 2Te3/Sb2Te3 and Si/Ge heterostructures show a remarkable enhancement of the thermoelectric efficiency compared to the bulk materials [2]. While gaining much attention in the last decade, the physical origin of this enhancement is still under debate. To contribute on this, we studied the electronic structure of these heterostructures with a fully relativistic screened Korringa-Kohn-Rostoker Green function method. The temperature-dependent thermoelectric transport properties were calculated within the relaxation time approximation of the Boltzmann theory. The ab initio calculations were done for various superlattice periods, while the influence of interfacial strain and doping on the anisotropic thermoelectric properties was studied in detail for both material systems [3,4,5]. With Bi 2Te3 and Sb2Te3 being members of the class of topological insulators [6], some insight on the thermoelectric transport of the topologically projected surface states will be given additionally.

[1] L. Bell, Science 321 (5895), 1457 (2008).
[2] R. Venkatasubramanian, E. Siivola, T. Colpitts, and B. O'Quinn, Nature 413, 597 (2001).
[3] N. F. Hinsche, I. Mertig, and P. Zahn, J. Phys.: Condens. Matter 24, 275501 (2012).
[4] N. F. Hinsche, B. Yu. Yavorsky, I. Mertig, and P. Zahn, Phys. Rev. B 84, 165214 (2011).
[5] N. F. Hinsche, B. Y. Yavorsky, M. Gradhand, M. Czerner, M. Winkler, J. König, H. Böttner, I. Mertig, and P. Zahn,Phys. Rev. B 86, 085323 (2012).
[6] H. Zhang, C. Liu, X. Qi, X. Dai, Z. Fang, and S. Zhang, Nature Physics 5, 438 (2009).

Announcement (pdf)

Invited by G. Cuniberti

Within the Transport Seminar

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