Kavli Affiliate: Feng Wang
| First 5 Authors: Su-Di Chen, Qixin Feng, Wenyu Zhao, Ruishi Qi, Zuocheng Zhang
| Summary:
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.
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