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 38.11: Poster

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

Semi ab initio phonon tunneling calculations in Au/Slab/Au by using non equilibrium Green's function formalism — •Saeideh Edalati Boostan, Michael Bachmann, Michael Czerner, and Christian Heiliger — I. Physikalisches Institut, Justus Liebig University Giessen, D-35392, Germany

Heat can be conducted across a nanometer-sized vacuum gap something that was deemed impossible until 2010 [1]. In this work we performed ab initio calculations using the abinit package to obtain the interatomic force constants of gold separated by a vacuum slab. These force constants are used in the non equilibrium Green's function formalism to calculate the transmission function and the temperature dependence of the thermal conductivity in the linear ballistic response regime [2, 3]. We analyze the phonon transport across the vacuum slab as a function of the thickness of the vacuum slab.

[1] Igor Altfeder, Andrey A. Voevodin, and Ajit K. Roy, Phys. Rev. Lett. 105, 166101 (2010)

[2] S. Datta, Electronic Transport in Mesoscopic Systems, Cambridge Univeristy Press (1995)

[3] P. E. Hopkins, P. M. Noris, M. S. Tsegaye, and A. W. Ghosh, J. Appl. Phys. 106, 063503 (2009)