Edge-channel interferometer at the graphene quantum Hall pn junction
Sei Morikawa (1), Satoru Masubuchi (1, 2), Rai Moriya (1), Kenji, Watanabe (3), Takashi Taniguchi (3), and Tomoki Machida (1, 2) ((1), Institute of Industrial Science, University of Tokyo, (2) Institute for Nano, Quantum Information Electronics, University of Tokyo
TL;DR
This paper reports the realization of a quantum Hall edge-channel interferometer in graphene pn junctions, demonstrating interference effects sensitive to magnetic flux and carrier density, confirmed by numerical modeling and coherence measurements.
Contribution
The work introduces a novel graphene-based edge-channel interferometer utilizing co-propagating quantum Hall edge channels at a pn junction, with detailed experimental and numerical analysis.
Findings
Observation of resistance oscillations due to interference
Numerical calculations match experimental data
Confirmation of coherence through pattern analysis
Abstract
We demonstrate a quantum Hall edge-channel interferometer in a high-quality graphene pn junction under a high magnetic field. The co-propagating p and n quantum Hall edge channels traveling along the pn interface functions as a built-in Aharanov-Bohm-type interferometer, the interferences in which are sensitive to both the external magnetic field and the carrier concentration. The trajectories of peak and dip in the observed resistance oscillation are well reproduced by our numerical calculation that assumes magnetic flux quantization in the area enclosed by the co-propagating edge channels. Coherent nature of the co-propagating edge channels are confirmed by the checkerboard-like pattern in the dc-bias and magnetic-field dependences of the resistance oscillations.
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