Intrinsic optical conductivity of a C2v symmetric topological insulator. (27th June 2017)

• Record Type: Journal Article
• Authors: Sengupta, Parijat; Matsubara, Masahiko; Bellotti, Enrico; Shi, Junxia
• Is Part Of: Superconductor science & technology. Volume 32:Number 7(2019:Jul.)
• Publication Date: 2017-06-27
• Subjects: topological Kondo insulator -- Berry phase -- persistent spin helix -- Rashba spin–orbit; Superconductivity -- Periodicals; Superconductors -- Periodicals; 537.623
• DOI: 10.1088/1361-6641/aa70ce
• Languages: English
• ISSNs: 0953-2048

Abstract

Abstract: In this work we analytically investigate the longitudinal optical conductivity of the C 2 v symmetric topological insulator. The conductivity expressions at T = 0 are derived using the Kubo formula and expressed as a function of the ratio of the Dresselhaus and Rashba parameters that characterize the low-energy Hamiltonian. We find that the longitudinal inter-band conductivity vanishes when Dresselhaus and Rashba parameters are equal in strength, also called the persistent spin helix state. The calculations are extended to obtain the frequency-dependent real and imaginary components of the optical conductivity for the topological Kondo insulator SmB6 which exhibits C 2 v symmetric and anisotropic Dirac cones hosting topological states at X ̄ point on the surface Brillouin zone.