Dresden 2014 – wissenschaftliches Programm

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HL: Fachverband Halbleiterphysik

HL 2: Topological insulators: mostly structure and electronic structure (with MA/O/TT)

HL 2.11: Vortrag

Montag, 31. März 2014, 12:15–12:30, POT 051

Oscillatory surface dichroism of the insulating topological insulator Bi2Te2Se — •Susmita Basak1, Madhab Neupane2, Hsin Lin1, N. Alidoust2, S.-Y. Xu2, Chang Liu2, I. Belopolski2, G. Bian2, J. Xiong2, H. Ji3, S. Jia3, S.-K. Mo4, M. Bissen5, M. Severson5, N. P. Ong2, T. Durakiewicz6, R. J. Cava3, A. Bansil1, and M. Z. Hasan21Department of Physics, Northeastern University, Boston, Massachusetts, USA — 2Joseph Henry Laboratory and Department of Physics, Princeton University, Princeton, New Jersey, USA — 3Department of Chemistry, Princeton University, Princeton, New Jersey, USA — 4Advanced Light Source, Lawrence Berkeley National Laboratory, Berkeley, California, USA — 5Synchrotron Radiation Center, Stoughton, Wisconsin, USA — 6Condensed Matter and Magnet Science Group, Los Alamos National Laboratory, Los Alamos, New Mexico, USA

We present a study of the effect of angular momentum transfer between polarized photons and topological surface states of the insulating topological insulator Bi2Te2Se using circular dichroism-angle resolved photoemission spectroscopy. The photoelectron dichroism demonstrate a dramatic sign flip with the change of photon frequency and we show that this is a consequence of a strong coupling between the photon field and the spin-orbit nature of the initial Dirac states on the surface. Our studies reveal the intrinsic dichroic behavior of topological surface states and point toward the potential utility of bulk insulating topological insulators in opto-spintronics device applications.

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