Infrared/Terahertz Spectra of the Photogalvanic Effect in (Bi,Sb)Te based Three Dimensional Topological Insulators

Abstract

We report on the systematic study of infrared/terahertz spectra of photocurrents in (Bi,Sb)Te based three dimensional topological insulators. We demonstrate that in a wide range of frequencies, ranging from fractions up to tens of terahertz, the photocurrent is caused by the linear photogalvanic effect (LPGE) excited in the surface states. The photocurrent spectra reveal that at low frequencies the LPGE emerges due to free carrier Drude-like absorption. The spectra allow to determine the room temperature carrier mobilities in the surface states despite the presents of thermally activate residual impurities in the material bulk. In a number of samples we observed an enhancement of the linear photogalvanic effect at frequencies between 30÷60 THz, which is attributed to the excitation of electrons from helical surface to bulk conduction band states. Under this condition and applying oblique incidence we also observed the circular photogalvanic effect driven by the radiation helicity.

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• Observation of Topological Photocurrents in the Chiral Weyl Semimetal RhSi
• Terahertz Photogalvanic Spectroscopy of Three Dimensional Topological Insulators
• Highly superlinear photogalvanic effects in (Bi${}_{0.3}$Sb${}_{0.7}$)${}_2$(Te${}_{0.1}$Se${}_{0.9}$)${}_3$: Probing 3D topological insulator surface states at room temperature
• Switchable quantized conductance in topological insulators revealed by the Shockley-Ramo theorem
• Bulk-Fermi-Arc Transition Induced Large Photogalvanic Effect in Weyl Semimetals
• Magnetic parity violation and parity-time-reversal-symmetric magnets
• Absence of quantization in the circular photogalvanic effect in disordered chiral Weyl semimetals
• Terahertz spin ratchet effect in magnetic metamaterials
• Direct Measurement of Helicoid Surface States in RhSi using Nonlinear Optics
• Visible and Terahertz Nonlinear Responses in the Topological Noble Metal Dichalcogenide PdTe2
• Enhanced detection of circularly polarized photons with topological materials