Photon Drag Effect in (Bi${}_{1-x}$Sb${}_x$)${}_2$Te${}_3$ Three Dimensional Topological Insulators

Abstract

We report on the observation of a terahertz radiation induced photon drag effect in epitaxially grown $n$- and $p$-type (Bi${}_{1-x}$Sb${}_x$)${}_2$Te${}_3$ three dimensional topological insulators with different antimony concentrations $x$ varying from 0 to 1. We demonstrate that the excitation with polarized terahertz radiation results in a $dc$ electric photocurrent. While at normal incidence a current arises due to the photogalvanic effect in the surface states, at oblique incidence it is outweighed by the trigonal photon drag effect. The developed microscopic model and theory show that the photon drag photocurrent is due to the dynamical momentum alignment by time and space dependent radiation electric field and implies the radiation induced asymmetric scattering in the electron momentum space.

15 pages, 12 figures

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• Photon drag of superconducting fluctuations in 2D systems
• Raman Photogalvanic Effect: photocurrent at inelastic light scattering
• Magnetic parity violation and parity-time-reversal-symmetric magnets
• Ultrafast dynamics of photocurrents in surface states of 3D topological insulators
• Photocurrent measurements in topological insulator ${\text{Bi}}_2{\text{Se}}_3$ nanowires
• Proposal for frequency-selective photodetector based on the resonant photon drag effect in a condensate of indirect excitons
• The impact of metallic contacts on spin-polarized photocurrents in topological insulator ${\text{Bi}}_2{\text{Se}}_3$ nanowires
• THz ratchet effect in HgTe interdigitated structures
• Electric Field Control of Spin Orbit Coupling and Circular Photogalvanic Effect in a True Ferrielectric Crystal
• Visible and Terahertz Nonlinear Responses in the Topological Noble Metal Dichalcogenide PdTe2
• Generation and manipulation of chiral terahertz waves emitted from the three-dimensional topological insulator Bi2Te3
• Controlling helicity-dependent photocurrent in polycrystalline Sb${}_2$Te${}_2$Se topological insulator thin films at ambient temperature through wave-vector of and photothermal gradient due to polarized light
• Enhanced detection of circularly polarized photons with topological materials