Direct measurement of terahertz conductivity in a gated monolayer semiconductor

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 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.

accepted version; typos corrected; minor updates in supporting information

References in corpus (4)

• Electrodynamics of Correlated Electron Materials
• Moiré heterostructures as a condensed matter quantum simulator
• Charge-transfer Contact to a High-Mobility Monolayer Semiconductor
• On-chip time-domain terahertz spectroscopy of superconducting films below the diffraction limit

Cited by in corpus (2)

• Cavity electrodynamics of van der Waals heterostructures
• Optimizing Aperture Geometry in THz-TDS for Accurate Spectroscopy of Quantum Materials