Direct Measurement of Terahertz Conductivity in a Gated Monolayer Semiconductor

Two-dimensional semiconductors and their moiré 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 WSe<sub>2</sub> monolayer encapsulated in hBN, we observe a 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.

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Publication Details

Journal
Nano Letters
Published
2025-05-05
DOI
https://doi.org/10.1021/acs.nanolett.5c01605
Citations
6
Primary Topic
2D Materials and Applications
Type
article
Field-Weighted Citation Impact
3.11

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article

Direct Measurement of Terahertz Conductivity in a Gated Monolayer Semiconductor

Wenyu Zhao, Ruishi Qi, Can Berk Uzundal, Takashi Taniguchi et al.
6 citations
Nano Letters
2D Materials and Applications
3.11
article

Direct Measurement of Terahertz Conductivity in a Gated Monolayer Semiconductor

Wenyu Zhao, Ruishi Qi, Can Berk Uzundal, Takashi Taniguchi, Kenji Watanabe, Jingxu Xie, Su-Di Chen, Q. Feng, Dishan Abeysinghe, Zuocheng Zhang, Feng Wang
article en
6 citations

Abstract

Two-dimensional semiconductors and their moiré 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 WSe<sub>2</sub> monolayer encapsulated in hBN, we observe a 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.

Nano LettersVol. 25(19)
Lawrence Berkeley National Laboratory (US), National Institute for Materials Science (JP), University of California System (US), Kavli Energy NanoScience Institute (US), Advanced Technology Group (Czechia) (CZ), University of California, Berkeley (US)
University of California Berkeley, Ministry of Education, Culture, Sports, Science and Technology, Japan Society for the Promotion of Science, NIH Office of the Director, Division of Materials Research, Division of Materials Sciences and Engineering
Affordable and clean energy
Openalex Percentile: Top 8%
2D Materials and Applications
3.11
DOIOpen Access PDFOpenAlex
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