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TT: Fachverband Tiefe Temperaturen

TT 55: TR: Topological Insulators 1 (jointly with HL and MA)

TT 55.3: Talk

Thursday, March 17, 2011, 16:30–16:45, HSZ 304

Electronic scattering and phonons in the 3D topological insulators Bi₂Se₃ and Cu_0.07Bi₂Se₃ — •Peter Lemmens^1,2, Vladimir Gnezdilov^1,3, Dirk Wulferding^1,2, and Helmuth Berger⁴ — ¹IPKM, TU-BS, Braunschweig, Germany — ²NTH, Germany — ³ILTPE NAS, Ukraine — ⁴EPFL, Lausanne, Switzerland

The Raman-active lattice vibrations of three dimensional topological insulators Bi₂Se₃ and Cu_0.07Bi₂Se₃ (R-3m) are investigated by Raman spectroscopy. All four expected Raman modes, 2A_1g and 2E_g, were determined for the first time and compared with the theoretical predictions. Electronic scattering is observed as a quasielastic response in the doped material at higher temperatures.

Work supported by DFG and NTH.