Berlin 2018 – scientific programme

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TT: Fachverband Tiefe Temperaturen

TT 63: Topology: Quantum Hall Systems

TT 63.3: Talk

Wednesday, March 14, 2018, 15:30–15:45, A 053

Emergent Chern-Simons excitations due to electron-phonon interaction on hexagonal lattices — •Andreas Sinner and Klaus Ziegler — Institut für Physik, Theorie II Universität Augsburg Universitätsstr. 1 D-86159, Augsburg, Germany

We address the problem of Dirac fermions interacting with inplane optical phonons. A gap in the spectrum of fermions leads to the emergence of the Chern-Simons excitations in the spectrum of phonons. We study the effect of those excitations on observable quantities: the phonon dispersion, the phonon spectral density, and the Hall conductivity.
A. Sinner, K. Ziegler, Phys. Rev. B 93, 125112 (2016).