Characterization and Manufacturing of Two-Dimensional Materials

8:00 am – 10:36 am, Monday March 17 // Session MAR-A28 //Anaheim Convention Center, 252A (Level 2)

Chair:: Ana Laura Elias, Binghamton University
Topics:
Sponsored by: DCMP

Direct measurement of terahertz conductivity in a gated monolayer semiconductor

9:48 am – 10:00 am

Presenter: Sudi Chen (University of California, Berkeley)

Authors: Qixin Feng (University of California, Berkeley), Wenyu Zhao (University of California, Berkeley), Ruishi Qi (University of California, Berkeley), Zuocheng Zhang (University of California, Berkeley), Dishan Abeysinghe (University of California, Berkeley), Can Uzundal (University of California, Berkeley), Jingxu Xie (Lawrence Berkeley National Laboratory), Takashi Taniguchi (National Institute for Materials Science), Kenji Watanabe (National Institute for Materials Science), feng wang (University of California, Berkeley)

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 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.

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