Dresden 2014 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 82: Metal Substrates II
O 82.1: Vortrag
Donnerstag, 3. April 2014, 16:00–16:15, WIL A317
Measuring the mode-selective e-ph interaction constant on Sb(111) using Helium atom scattering — •Patrick Kraus1, Michael Mayrhofer-R.1, Florian Apolloner1, Christian Gösweiner1, Giorgio Benedek2, Salvador Miret-Artés3, and Wolfgang E. Ernst1 — 1IEP, University of Technology, Graz, Austria — 2DIPC, San Sebastián, Spain — 3C.S.I.C, Madrid, Spain
As one of the essential components in the recently discovered group of topological insulators [1], the semimetal antimony (Sb) is an attractive candidate for studying the properties of its surface. Quite recently the surface phonon dispersion curve of Sb(111) as well as the influences of e-ph interaction were calculated using DFPT [2]. Helium Atom Scattering allows to investigate elastic as well as inelastic phenomena associated with structure and dynamics of the electronic corrugation slightly above the Sb(111) surface. Using exact approaches such as the Close-Coupling-Method, a fundamental analysis of the surface corrugation is possible. Furthermore, this approach can be extended to include inelastic interactions [3,4], rendering the measurement of the mode-selective electron-phonon interaction constant possible. The complete procedure, beginning with the determination of the three dimensional static interaction potential to the evaluation of the mode-selected electron-phonon interaction, will be presented. [1] H. Zhang et al., Nature Physics 5 (2009) 438-442 [2] D. Campi et al., Phys. Rev. B. 86 (2012) 075446 [3] A.S. Sanz and S. Miret-Artés, Phys. Rep. 451 (2007), 37-154 [4] M. Mayrhofer-R. et. al., Phys. Rev. B. 88 (2013), 205425