Berlin 2012 – scientific programme

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DS: Fachverband Dünne Schichten

DS 38: Poster III: Resistive switching (jointly with DF, KR, HL); Thermoelectric materials (Focused session); Micro- and nanopatterning (jointly with O); Ion irradiation effects

DS 38.14: Poster

Thursday, March 29, 2012, 17:30–19:00, Poster E

Thermal conductance of ballistic point contacts — •Alina Tittel, Thorben Bartsch, Christian Heyn, and Wolfgang Hansen — Institut für Angewandte Physik, Jungiusstr. 11, D-20355 Hamburg, Germany

We study the thermal conductance of ballistic point contacts that are realized as few nanometer long pillars. The pillars were fabricated using molecular beam epitaxy, with a combination of in situ local droplet etching and ex situ selective chemical wet-etching of a sacrificial layer [1]. They have typical length between 2 nm and 8 nm and diameters of about 100 nm. Because of the short pillar length, which is significantly smaller than the phonon mean free path up to room temperature, the thermal conductance is dominated by ballistic thermal transport. [2] The fabrication technique allows for control of composition, geometry and density of the pillars. Here we present investigations of the influence of such modifications on the thermal conductance. The measurements were performed with the 3w method.

[1] Ch. Heyn et al., Appl. Phys. Lett. 98, 033105 (2011). [2] Th. Bartsch et al. submitted , published on arXive: http://arxiv.org/abs/1111.1164