Terahertz Kerr and Reflectivity Measurements on the Topological Insulator Bi2Se3

Abstract

We report the first terahertz Kerr measurements on bulk crystals of the topological insulator Bi2Se3. At T=10K and fields up to 8T, the real and imaginary Kerr angle and reflectance measurements utilizing both linearly and circularly polarized incident radiation were measured at a frequency of 5.24meV. A single fluid free carrier bulk response can not describe the line-shape. Surface states with a small mass and surprisingly large associated spectral weight quantitatively fit all data. However, carrier concentration inhomogeneity has not been ruled out. A method employing a gate is shown to be promising for separating surface from bulk effects.

10 pages, 5 figures

References in corpus (10)

• Quantum Spin Hall Effect and Topological Phase Transition in HgTe Quantum Wells
• Topological Insulators with Inversion Symmetry
• Discovery (theoretical prediction and experimental observation) of a large-gap topological-insulator class with spin-polarized single-Dirac-cone on the surface
• A topological Dirac insulator in a quantum spin Hall phase : Experimental observation of first strong topological insulator
• Topological Field Theory of Time-Reversal Invariant Insulators
• First direct observation of Spin-textures in Topological Insulators : Spin-resolved ARPES as a probe of topological quantum spin Hall effect and Berry's phase
• Topological Surface States Protected From Backscattering by Chiral Spin Texture
• Three dimensional topological invariants for time reversal invariant Hamiltonians and the three dimensional quantum spin Hall effect
• Bulk Fermi surface coexistence with Dirac surface state in Bi${}_2$Se${}_3$: a comparison of photoemission and Shubnikov-de Haas measurements
• Strong surface scattering in ultrahigh mobility Bi2Se3 topological insulator crystals

Cited by in corpus (12)

• Spatially resolved femtosecond pump-probe study of topological insulator Bi2Se3
• Shift charge and spin photocurrents in Dirac surface states of topological insulator
• Half-integer quantum Hall effect of disordered Dirac fermions at a topological insulator surface
• Gate-Variable Mid-Infrared Optical Transitions in a $(B{i}_{1-x}S{b}_x{)}_{2}T{e}_3$ Topological Insulator
• Optical properties of magnetically doped ultra-thin topological insulator slabs
• Dirac cone shift of a passivated topological Bi2Se3 interface state
• Giant plateau in the THz Faraday angle in gated Bi2Se3
• Polarization-sensitive terahertz time-domain spectroscopy system without mechanical moving parts
• Anomaly-induced sound absorption in Weyl semimetals
• Magneto-optical Spectroscopy with RAMBO: A Table-Top 30 T Magnet
• From classical to quantum regime of topological surface states via defect engineering
• Modified Martin-Puplett interferometer for magneto-optical Kerr effect measurements at sub-THz frequencies