Journal
PHYSICAL REVIEW B
Volume 86, Issue 20, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.86.201401
Keywords
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Funding
- SRC Focus Center on Functional Engineered Nano Architectonics (FENA)
- US Army Research Office
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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 mu A/cm may be achieved at elevated temperatures with the illumination power of 1 W/cm(2) in the THz range on Bi2Se3. These advantages could enable room-temperature detection of far-infrared radiation.
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