Dresden 2020 – scientific programme

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O: Fachverband Oberflächenphysik

O 105: Scanning Probe Techniques II: Method Development (joint session O/CPP)

O 105.9: Talk

Thursday, March 19, 2020, 12:30–12:45, WIL C107

Non-contact heat transfer between metallic surfaces — •Paul Philip Schmidt and Carsten Henkel — Universität Potsdam, Institut für Physik und Astronomie

The heat transfer at distances beyond contact can be described by fluctuating electrodynamics developed by Rytov [1]. Recent experiments provide deviations from the theoretical predictions. In the measurements, a flat gold surface was approached by a gold-coated probe tip, the distance between the two being less than 10nm [2,3]. In this work we model the measured data in a phenomenological way. The basic assumption is that at a critical distance, the heat flow between flat surface elements saturates, proportional to the number of transport channels. When combined with the proximity force (Deryagin) approximation, this “snap-in model” is in good agreement with the experimental data [4].

[1] D.V.H.M. Polder and M. Van Hove, PRB 4 (1971) 3303.

[2] K. Kloppstech, N. Könne, S.-A. Biehs, A. W. Rodriguez, L. Worbes, D. Hellmann, and A. Kittel, Nature Commun. 8 (2017) 14457.

[3] L. Cui, W. Jeong, V. Fernández-Hurtado, J. Feist, F. J. García-Vidal, J. C. Cuevas, E. Meyhofer, and P. Reddy, Nature Commun. 8 (2017) 14479.

[4] C. Henkel and P. P. Schmidt, JOSA B 36 (2019) C10.