Magneto-optical effects in semimetallic Bi1−xSbx(x=0.015

Abstract

We report the results of infrared and magneto-optical spectroscopy study on electrodynamic response of bismuth doped with 1.5 % of antimony. The spectra are presented for temperatures down to 4.2 K, and in magnetic fields as high as 18 Tesla. The results reveal strong magnetooptical activity, similar to pure bismuth, however there are some differences introduced by antimony doping. Analysis of optical functions reveals that the two type of charge carriers respond differently to external magnetic field. Finally, when the system enters the extreme quantum regime, both the inter-and intra-band Landau Level transition are observed in the spectra.

Fanoq-reversal in topological insulator Bi2Se3

“…Namely, as the field increases, the plasma edge is gradually altered and a characteristic 'second plasma edge' develops around 220 cm −1 , similar to what was observed in Bi [26] and Bi 1−x Sb x [27]. In addition, at the lowest frequencies the reflectance is suppressed as the cyclotron resonance enters the measured frequency window.…”

Observation of cyclotron antiresonance in the topological insulator Bi2Te3

“…In other to explore the origins of observed cyclotron antiresonance we employ Drude model modified for the presence of magnetic field 22 . In spite of its simplicity, this model has been very successful in describing magnetooptical data in a variety of condensed matter systems, most notably topological insulators 8,9,13,23 . In the semiclassical approximation, the dynamics of charge carriers (with effective mass m) in a solid is governed by 24 :…”

Revealing ‘plasmaron’ feature in DySb by optical spectroscopy study

“…This is a typical metallic response, consistent with the resistivity data at zero magnetic field. With increasing frequency, R(ω) decreases, reaching a minimum value at about 4000 cm −1 at 300 K, usually referred to the 'screened' plasma edge [39,[45][46][47][48][49][50][51][52][53]. The relatively low frequency of the 'screened' plasma edge might be ascribed to its semimetal response.…”