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

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