Tunable photo-galvanic effect on topological insulator surfaces via proximity interactions

Abstract

An unusual photo-galvanic effect is predicted on the topological insulator surface when its semi-metallic electronic spectrum is modified by an adjacent ferromagnet. The effect is correlated with light absorption in a wide frequency range (from a few to hundreds of meV) and produces a pronounced response that is not only resonant to the photon energy but also tunable by an external electrical bias. The exceptionally strong peak photocurrent of the order of $\mu$A/cm may be achieved at elevated temperatures with the illumination power of 1 W/cm${}^2$ in the THz range on Bi${}_2$Se${}_3$. These advantages could enable room-temperature detection of far-infrared radiation.

10 pages, 3 figures

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• Gate-Voltage Control of Chemical Potential and Weak Anti-localization in Bismuth Selenide
• Spin transport in proximity induced ferromagnetic graphene
• First Principles Studies on 3-Dimentional Strong Topological Insulators: Bi2Te3, Bi2Se3 and Sb2Te3
• Spin-polarized electric currents in diluted magnetic semiconductor heterostructures induced by terahertz and microwave radiation

Cited by in corpus (10)

• Low-frequency divergence and quantum geometry of the bulk photovoltaic effect in topological semimetals
• Photon Drag Effect in (Bi${}_{1-x}$Sb${}_x$)${}_2$Te${}_3$ Three Dimensional Topological Insulators
• Shift charge and spin photocurrents in Dirac surface states of topological insulator
• Giant spin-polarized current in a Dirac fermion system at cyclotron resonance
• Resonant photovoltaic effect in doped magnetic semiconductors
• Spin Hall photoconductance in a 3D topological insulator at room temperature
• Coherent control of optical injection of spin and currents in topological insulators
• Synchrotron radiation induced magnetization in magnetically-doped and pristine topological insulators
• Bulk photovoltaic effects in altermagnets
• THz Photodetector using sideband-modulated transport through surface states of a 3D Topological Insulator