Speaker
Rolando Valdes Aguilar
(Department of Physics and Astronomy. Johns Hopkins University)
Description
R. Valdés Aguilar1, A. V. Stier1, W. Liu1, L. S. Bilbro1, D. K. George2, N. Bansal3, L. Wu1, J. Cerne2, A. G. Markelz2, S. Oh3, and N. P. Armitage1
1. The Institute for Quantum Matter, Department of Physics and Astronomy, The Johns Hopkins University, Baltimore, Maryland 21218, USA
2. Department of Physics, University at Buffalo, State University of New York. Buffalo, New York 14260, USA
3. Department of Physics and Astronomy, Rutgers the State University of New Jersey. Piscataway, New Jersey 08854, USA
We report the THz response of thin films of the topological insulator Bi2Se3. At low frequencies, transport is essentially thickness independent showing the dominant contribution of the surface electrons. Despite their extended exposure to ambient conditions, these surfaces exhibit robust properties including narrow, almost thickness-independent Drude peaks, and an unprecedentedly large polarization rotation of linearly polarized light reflected in an applied magnetic field. This Kerr rotation can be as large as 65° and can be explained by a cyclotron resonance effect of the surface states. In addition, we will report on the long term effects of atmospheric exposure of thin films of Bi2Se3
Primary author
Rolando Valdes Aguilar
(Department of Physics and Astronomy. Johns Hopkins University)
