Berlin 2012 – scientific programme

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MA: Fachverband Magnetismus

MA 22: Joint Session "Topological Insulators II" (jointly with DS, HL, O, TT)

MA 22.13: Talk

Wednesday, March 28, 2012, 12:45–13:00, EB 301

Collision dominated scattering in 3D topological insulators — •Peter Lemmens¹, Vladimir Gnezdilov², Dirk Wulferding¹, Yurii Pashkevich³, Ekaterina Pomjakushina⁴, Kazimierz Conder⁴, and Helmuth Berger⁵ — ¹IPKM, TU-BS, Braunschweig, Germany — ²ILTPE NAS, Ukraine — ³DonFTI, Donetsk, Ukraine — ⁴PSI, Villigen, Switzerland — ⁵EPFL, Lausanne, Switzerland

Despite topological protection in 3D topological insulators there exist scattering processes induced by a resonant excitation from a bulk valence band to Dirac states. This signal in Raman scattering has a Lorentzian lineshape and spin-helical symmetry with a scattering rate of 40 cm⁻¹. A comparison of different compounds (Bi₂Se₃, Bi₂Te₃), substitution experiments as well as first results on BiTeI with giant Rashba spin splitting are presented. Work supported by DFG and NTH.