Ultrabroadband photosensitivity from visible to terahertz at room temperature

TL;DR

This study demonstrates that the charge-density wave system in 1T-TaS2 exhibits ultrabroadband photosensitivity from visible to terahertz frequencies at room temperature, enabling new uncooled, sensitive photoelectronic applications.

Contribution

It reveals that 1T-TaS2's charge-density wave system can be highly responsive to light across a broad spectrum at room temperature, a novel property for this material.

Findings

Current responsivity around 1 AW-1 from visible to terahertz

Operates effectively at room temperature without cooling

Enables ultrabroadband, sensitive photoelectronics

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. Here we show that the CDW system of 1T-TaS2 is highly sensitive to light directly from visible down to terahertz, with current responsivities around 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 terahertz spectral range.