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Topological transition on anisotropic hexagonal lattices and effective phonon model for the quantum Hall transition

Date
Feb 4, 2020
Time
2:00 PM - 3:00 PM
Speaker
PD Dr. Andreas Sinner
Affiliation
Universität Augsburg, Institut für Physik, Theorie II
Language
en
Main Topic
Materialien
Host
Grit Rötzer
Description
The topology of the band structure, which is determined by the lattice symmetries, has a strong influence on the transport properties. We consider an anisotropic honeycomb lattice and study the effect of a continuously deformed band structure on the conductivity and optical properties. We find a strong suppression of the conductivity in one direction and increment by several orders in another which leads to a considerable change of optical properties.

We further study a gap generation in a two-dimensional Dirac fermion system which are coupled to in-plane phonons. At sufficiently strong electron-phonon interaction a gap appears in the spectrum of fermions. The structure of elementary excitations above the gap in the corresponding phase reveals the presence of scale invariant parity breaking terms which resemble Chern-Simons excitations. The Kubo formula yields quantized Hall plateaux.

References: EPL 119, 27001 (2017); PRB 97, 235411 (2018); PRB 93, 125112 (2016); Ann. Phys. 400, 262 (2018); arxiv:1908.00442.
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Links

Last modified: Jan 25, 2020, 12:06:31 AM

Location

Leibniz Institut für Festkörper- und Werkstoffforschung Dresden (D2E.27, IFW Dresden)Helmholtzstraße2001069Dresden
Homepage
http://www.ifw-dresden.de

Organizer

Leibniz Institut für Festkörper- und Werkstoffforschung DresdenHelmholtzstraße2001069Dresden
Homepage
http://www.ifw-dresden.de
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