Quantum Hall-based superconducting interference device.


We present a study of a graphene-based Josephson junction with dedicated side gates carved from the same sheet of graphene as the junction itself. These side gates are highly efficient and allow us to modulate carrier density along either edge of the junction in a wide range. In particular, in magnetic fields in the 1- to 2-T range, we are able to populate the next Landau level, resulting in Hall plateaus with conductance that differs from the bulk filling factor. When counter-propagating quantum Hall edge states are introduced along either edge, we observe a supercurrent localized along that edge of the junction. Here, we study these supercurrents as a function of magnetic field and carrier density.





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Publication Info

Seredinski, Andrew, Anne W Draelos, Ethan G Arnault, Ming-Tso Wei, Hengming Li, Tate Fleming, Kenji Watanabe, Takashi Taniguchi, et al. (2019). Quantum Hall-based superconducting interference device. Science Advances, 5(9). p. eaaw8693. 10.1126/sciadv.aaw8693 Retrieved from https://hdl.handle.net/10161/19611.

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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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