Strong interband Faraday rotation in 3D topological insulator Bi2Se3
L. Ohnoutek, M. Hakl, M. Veis, B. A. Piot, C. Faugeras, G. Martinez,, M. V. Yakushev, R. W. Martin, C. Drasar, A. Materna, G. Strzelecka, A., Hruban, M. Potemski, and M. Orlita
TL;DR
This paper reports a notably strong Faraday rotation effect in the 3D topological insulator Bi2Se3, caused by bulk interband excitations and linked to its Dirac-type electronic structure, breaking time-reversal symmetry with an external magnetic field.
Contribution
It demonstrates a significant non-magnetic Faraday rotation in Bi2Se3 due to its unique Dirac-like electronic properties, expanding understanding of magneto-optical effects in topological insulators.
Findings
Strong Faraday rotation observed in Bi2Se3
Effect attributed to Dirac-type Hamiltonian and relativistic electron-hole behavior
Breaks time-reversal symmetry with external magnetic field
Abstract
The Faraday effect is a representative magneto-optical phenomenon, resulting from the transfer of angular momentum between interacting light and matter in which time-reversal symmetry has been broken by an externally applied magnetic field. Here we report on the Faraday rotation induced in the prominent 3D topological insulator Bi2Se3 due to bulk interband excitations. The origin of this non-resonant effect, extraordinarily strong among other non-magnetic materials, is traced back to the specific Dirac-type Hamiltonian for Bi2Se3, which implies that electrons and holes in this material closely resemble relativistic particles with a non-zero rest mass.
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