Year: 2025
Type: article
Abstract: Microwave transmission line spectroscopy is used to observe the integer quantum Hall effect in two samples of monolayer graphene with different geometries that are resistively coupled to a coplanar waveguide. We find plateaus in transmitted power that do not vary significantly with microwave frequency but are significantly different for two samples due to their shape. With each drop in transmitted power corresponding to an additional quantum Hall edge mode that shorts the transmission line to ground, these well-known quanta of conductance allow us to calibrate the sensitivity of the devices. One sample with short contact regions matched the sensitivity expected when considering only the quantum Hall conductance of $\ensuremath{\nu}{e}^{2}/h$; another sample with long contact regions demonstrated a nearly threefold enhancement in sensitivity. We model this result with a purely resistive circuit that introduces an additional resistance to explain the increased sensitivity.
Authors: S. Dietrich, A. Akbari-Sharbaf, J. H. Edgar, A. Roubos, M. L. Freeman, L. W. Engel
Language: English
Subfield: Atomic and Molecular Physics, and Optics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: green
Awards: G1019936685, NNCI: Mid-Atlantic Nanotechnology Hub (MANTH), National High Magnetic Field Laboratory Renewal 2023-2027, G742574937, CAREER: Microwave transmission spectroscopy of van der Waals materials, Hexagonal Boron Nitride Crystal Growth from Solution: A Study of Fundamentals, G8152425740
OpenAlex ID: W4410157517