Year: 2012
Type: article
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 $\ensuremath{\mu}$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.
Source: Physical Review B
Authors: Yuriy G. Semenov, Xiaodong Li, Ki Wook Kim
Institution: North Carolina State University
Language: English
Subfield: Atomic and Molecular Physics, and Optics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: green
OpenAlex ID: W1972078182