Berlin 2015 – wissenschaftliches Programm

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DS: Fachverband Dünne Schichten

DS 36: Poster Session I

DS 36.82: Poster

Donnerstag, 19. März 2015, 09:30–12:00, Poster A

Calculation of Thermal Conductivity across an Interface using Beam Matching — Debanjan Basu¹, •Peter Blöchl¹, Cynthia Volkert², and Christian Jooß² — ¹Institute for Theoretical Physics,Clausthal University of Technology — ²Institute for Material Physics, University of Göttingen

Thermal conductivity is an important factor affecting the efficiency of thermoelectric devices. Our goal is to explore the thermal transmission due to phonons in multilayered structures on a mode-by-mode basis using the Beam Matching Technique. For this purpose, we determine the “complex bandstructure”, which describes propagating as well as evanescent phonon modes of the individual materials of this multilayer. We also describe how to extract the matching conditions from the classical equations of motion for the atoms. The connection between our method and the Landauer-Buttiker description of conductivity for phonons shall be discussed.

This work is funded by the DFG Schwerpunktprogramme 1386.