Compact SQUID realized in a double layer graphene heterostructure

Indolese, David I. and Karnatak, Paritosh and Kononov, Artem and Delagrange, Raphaëlle and Haller, Roy and Wang, Lujun and Makk, Péter and Watanabe, Kenji and Taniguchi, Takashi and Schönenberger, Christian. (2020) Compact SQUID realized in a double layer graphene heterostructure. Nano Letters, 20 (10). pp. 7129-7135.

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Official URL: https://edoc.unibas.ch/80431/

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Two-dimensional systems that host one-dimensional helical states are exciting from the perspective of scalable topological quantum computation when coupled with a superconductor. Graphene is particularly promising for its high electronic quality, versatility in van der Waals heterostructures and its electron and hole-like degenerate 0th Landau level. Here, we study a compact double layer graphene SQUID (superconducting quantum interference device), where the superconducting loop is reduced to the superconducting contacts, connecting two parallel graphene Josephson junctions. Despite the small size of the SQUID, it is fully tunable by independent gate control of the Fermi energies in both layers. Furthermore, both Josephson junctions show a skewed current phase relationship, indicating the presence of superconducting modes with high transparency. In the quantum Hall regime we measure a well defined conductance plateau of 2$e^2/h$ an indicative of counter propagating edge channels in the two layers.
Faculties and Departments:05 Faculty of Science > Departement Physik > Physik > Experimentalphysik Nanoelektronik (Schönenberger)
UniBasel Contributors:Indolese, David and Karnatak, Paritosh and Kononov, Artem and Haller, Roy and Wang, Lujun and Makk, Peter and Schönenberger, Christian
Item Type:Article, refereed
Article Subtype:Research Article
Publisher:American Chemical Society
Note:Publication type according to Uni Basel Research Database: Journal article
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Last Modified:14 Apr 2021 12:52
Deposited On:14 Apr 2021 12:52

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