1. Direct measurement of terahertz conductivity in a gated monolayer semiconductor
- Author
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Chen, Su-Di, Feng, Qixin, Zhao, Wenyu, Qi, Ruishi, Zhang, Zuocheng, Abeysinghe, Dishan, Uzundal, Can, Xie, Jingxu, Taniguchi, Takashi, Watanabe, Kenji, and Wang, Feng
- Subjects
Condensed Matter - Mesoscale and Nanoscale Physics ,Condensed Matter - Strongly Correlated Electrons - Abstract
Two-dimensional semiconductors and their moir\'e superlattices have emerged as important platforms for investigating correlated electrons. However, many key properties of these systems, such as the frequency-dependent conductivity, remain experimentally inaccessible because of the mesoscopic sample size. Here we report a technique to directly measure the complex conductivity of electrostatically gated two-dimensional semiconductors in the terahertz frequency range. Applying this technique to a WSe2 monolayer encapsulated in hBN, we observe clear Drude-like response between 0.1 and 1 THz, in a density range challenging to access even in DC transport. Our work opens a new avenue for studying tunable van der Waals heterostructures using terahertz spectroscopy.
- Published
- 2024