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FAR-INFRARED DETECTION USING WEYL SEMIMETALS

United States Patent Application

20180026185
A1
View the Complete Application at the US Patent & Trademark Office
The generation of photocurrent in an ideal two-dimensional Dirac spectrum is symmetry forbidden. In sharp contrast, a three-dimensional Weyl semimetal can generically support significant photocurrent due to the combination of inversion symmetry breaking and finite tilts of the Weyl spectrum. To realize this photocurrent, a noncentrosymmetric Weyl semimetal is coupled to a pair of electrodes and illuminated with circularly polarized light without any voltage applied to the Weyl semimetal. The wavelength of the incident light can range over tens of microns and can be adjusted by doping the Weyl semimetal to change its chemical potential.
CHAN, Ching-Kit (Los Angeles, CA), LEE, Patrick A. (Brookline, MA), LINDNER, Netanel (Aviel, IL), REFAEL, Gil (Pasadena, CA), MA, Qiong (Cambridge, MA), XU, Suyang (Cambridge, MA), GEDIK, Nuh (Watertown, MA)
Massachusetts Institute of Technology (Cambridge MA), California Institute of Technology (Pasadena CA), Technion R&D Foundation (Haifa)
15/ 656,373
July 21, 2017
GOVERNMENT SUPPORT [0002] This invention was made with Government support under Grant No. DE-FG02-03ER46076 awarded by the Department of Energy. The Government has certain rights in the invention.