Investigation of Supercurrent in the Quantum Hall Regime in Graphene Josephson Junctions

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2018-06-01

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Abstract

© 2018, Springer Science+Business Media, LLC, part of Springer Nature. In this study, we examine multiple encapsulated graphene Josephson junctions to determine which mechanisms may be responsible for the supercurrent observed in the quantum Hall (QH) regime. Rectangular junctions with various widths and lengths were studied to identify which parameters affect the occurrence of QH supercurrent. We also studied additional samples where the graphene region is extended beyond the contacts on one side, making that edge of the mesa significantly longer than the opposite edge. This is done in order to distinguish two potential mechanisms: (a) supercurrents independently flowing along both non-contacted edges of graphene mesa, and (b) opposite sides of the mesa being coupled by hybrid electron–hole modes flowing along the superconductor/graphene boundary. The supercurrent appears suppressed in extended junctions, suggesting the latter mechanism.

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Science & Technology, Physical Sciences, Physics, Applied, Physics, Condensed Matter, Physics, Graphene, Supercurrent, Josephson junction, Quantum Hall, EDGE

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10.1007/s10909-018-1872-9

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Draelos, A, MT Wei, A Seredinski, C Ke, K Watanabe, T Taniguchi, M Yamamoto, S Tarucha, et al. (2018). Investigation of Supercurrent in the Quantum Hall Regime in Graphene Josephson Junctions. Journal of Low Temperature Physics, 191(5-6). pp. 288–300. 10.1007/s10909-018-1872-9 Retrieved from https://hdl.handle.net/10161/18112.

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Scholars@Duke

Finkelstein

Gleb Finkelstein

Professor of Physics

Gleb Finkelstein is an experimentalist interested in physics of quantum nanostructures, such as Josephson junctions and quantum dots made of carbon nanotubes, graphene, and topological materials. These objects reveal a variety of interesting electronic properties that may form a basis for future quantum devices.


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