Edge dependence of the supercurrent in the quantum Hall regime

Year: 2025

Type: article

Abstract: The authors show here that the supercurrent in graphene Josephson junctions under quantum Hall conditions is strictly mediated by physical edges. By comparing native, etched, edge-free, and gate-defined geometries, they find that the Josephson coupling disappears without edges and reemerges only when edge conduction is restored. This demonstrates that the supercurrent originates from Andreev bound states formed by paired upstream and downstream modes along the edges, highlighting edge engineering as a key strategy for realizing hybrid topological superconductivity in quantum Hall systems.

Source: Physical review. B./Physical review. B

DOI: 10.1103/m3lt-6cnc

Authors: Seong Jang, Geon-Hyoung Park, Kenji Watanabe, Takashi Taniguchi, Gil-Ho Lee

Institutions: Pohang University of Science and Technology, National Institute for Materials Science

Language: English

Topic: Topological Materials and Phenomena

Subfield: Atomic and Molecular Physics, and Optics

Field: Physics and Astronomy

Domain: Physical Sciences

Open Access status: green

Funders: National Research Foundation, National Research Foundation of Korea, Iran Telecommunication Research Center, Ministry of Science and ICT, South Korea, Samsung Science and Technology Foundation, Samsung, Institute for Information and Communications Technology Promotion

OpenAlex ID: W4416935930