Research ArticlePHYSICS

Ultrabroadband photosensitivity from visible to terahertz at room temperature

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Science Advances  03 Aug 2018:
Vol. 4, no. 8, eaao3057
DOI: 10.1126/sciadv.aao3057

Abstract

Charge density wave (CDW) is one of the most fundamental quantum phenomena in solids. Different from ordinary metals in which only single-particle excitations exist, CDW also has collective excitations and can carry electric current in a collective fashion. Manipulating this collective condensation for applications has long been a goal in the condensed matter and materials community. We show that the CDW system of 1T-TaS2 is highly sensitive to light directly from visible down to terahertz, with current responsivities on the order of ~1 AW−1 at room temperature. Our findings open a new avenue for realizing uncooled, ultrabroadband, and sensitive photoelectronics continuously down to the terahertz spectral range.

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