Tunable photogalvanic effect on topological insulator surfaces via proximity interactions

2012/08/13 by Yuriy G. Semenov, Xiaodong Li, K. W. Kim +1 · 1 citation
Mathematics · Physics and Astronomy · #Combinatorics #Condensed matter physics #Mathematics #Photonic Crystals and Applications #Photorefractive and Nonlinear Optics #Physics #Topological Materials and Phenomena #Topological insulator #Topology (electrical circuits) #cond-mat.mes-hall #cond-mat.mtrl-sci

paper · pdf · doi:10.1103/physrevb.86.201401

10 pages, 3 figures

arxiv created 2012/08/13 · openalex publication_date 2012/11/01 · arxiv updated 2015/06/11 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05

Abstract

An unusual photogalvanic effect is predicted on the topological insulator surface when its semimetallic 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 \ensuremathμA/cm may be achieved at elevated temperatures with the illumination power of 1 W/cm² in the THz range on Bi₂Se₃. These advantages could enable room-temperature detection of far-infrared radiation.

Citations

• Spin transport in proximity-induced ferromagnetic graphene
• Topological insulators and superconductors
• Topological Insulators
• Effective continuous model for surface states and thin films of three-dimensional topological insulators
• Fine Structure Constant Defines Visual Transparency of Graphene

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