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TT: Fachverband Tiefe Temperaturen

TT 24: Molecular Electronics and Photonics

TT 24.1: Vortrag

Dienstag, 2. April 2019, 09:30–09:45, H22

Heat transport through single-atom and single-molecule junctions — •Fabian Pauly — Okinawa Institute of Science and Technology Graduate University, Okinawa, Japan

In this presentation, I will discuss our present theoretical understanding of heat transport at the atomic scale. Starting from results of a collaboration with experimentalists [1], I will elicidate the importantance of phonons for the thermal conductance of atomic-size contacts made of different metals [2] and will examine the validity of the Wiedemann-Franz law, which relates the electrical and the thermal conductance. Next, I will present a newly developed procedure to determine transmission eigenchannels for coherent phonon transport in nanoscale devices using the framework of nonequilibrium Green’s functions [3]. To illustrate its value, I will study phonon eigenchannels in various systems ranging from metallic atomic-size contacts to different single-molecule junctions.

[1] L. Cui et al., Science 355, 1192 (2017)

[2] J. C. Klöckner et al., Phys. Rev. B 96, 205405 (2017)

[3] J. C. Klöckner et al., Phys. Rev. B 97, 155432 (2018)