Regensburg 2019 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 52: Focus Session: Electron-Phonon Interactions I

O 52.6: Vortrag

Mittwoch, 3. April 2019, 12:15–12:30, H15

Thermally-Enhanced Fröhlich Coupling in SnSe — •Fabio Caruso, Maria Troppenz, Santiago Rigamonti, and Claudia Draxl — Institut für Physik and IRIS Adlershof, Humboldt-Universität zu Berlin

To gain insight into the peculiar temperature dependence of the thermoelectric material SnSe, we employ many-body perturbation theory and explore the influence of the electron-phonon interaction on its electronic and transport properties. We show that a lattice dynamics characterized by soft highly-polar phonons induces a large thermal enhancement of the Fröhlich interaction. We account for these phenomena in ab-initio calculations of the photoemission spectrum and electrical conductivity at finite temperature, unraveling the mechanisms behind recent experimental data. Our results reveal a complex interplay between lattice thermal expansion and Fröhlich coupling, providing a new rationale for the in-silico prediction of transport coefficients of high-performance thermoelectrics.