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Quantum oscillations of the critical current and high-field superconducting proximity in ballistic graphene

Research output: Contribution to Journal/Magazine › Letter › peer-review

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Quantum oscillations of the critical current and high-field superconducting proximity in ballistic graphene. / Ben Shalom, M.; Zhu, M. J.; Fal'ko, V. I. et al.
In: Nature Physics, Vol. 12, No. 4, 04.2016, p. 318-322.

Research output: Contribution to Journal/Magazine › Letter › peer-review

Harvard

Ben Shalom, M, Zhu, MJ, Fal'ko, VI, Mishchenko, A, Kretinin, AV, Novoselov, KS, Woods, CR, Watanabe, K, Taniguchi, T, Geim, AK & Prance, JR 2016, 'Quantum oscillations of the critical current and high-field superconducting proximity in ballistic graphene', Nature Physics, vol. 12, no. 4, pp. 318-322. https://doi.org/10.1038/nphys3592

APA

Ben Shalom, M., Zhu, M. J., Fal'ko, V. I., Mishchenko, A., Kretinin, A. V., Novoselov, K. S., Woods, C. R., Watanabe, K., Taniguchi, T., Geim, A. K., & Prance, J. R. (2016). Quantum oscillations of the critical current and high-field superconducting proximity in ballistic graphene. Nature Physics, 12(4), 318-322. https://doi.org/10.1038/nphys3592

Vancouver

Ben Shalom M, Zhu MJ, Fal'ko VI, Mishchenko A, Kretinin AV, Novoselov KS et al. Quantum oscillations of the critical current and high-field superconducting proximity in ballistic graphene. Nature Physics. 2016 Apr;12(4):318-322. Epub 2015 Dec 14. doi: 10.1038/nphys3592

Author

Ben Shalom, M. ; Zhu, M. J. ; Fal'ko, V. I. et al. / Quantum oscillations of the critical current and high-field superconducting proximity in ballistic graphene. In: Nature Physics. 2016 ; Vol. 12, No. 4. pp. 318-322.

Bibtex

@article{3d3302f2c6cf436cb6948562d264ec9d,
title = "Quantum oscillations of the critical current and high-field superconducting proximity in ballistic graphene",
abstract = "Graphene-based Josephson junctions provide a novel platform for studying the proximity effect due to graphene{\textquoteright}s unique electronic spectrum and the possibility to tune junction properties by gate voltage. Here we describe graphene junctions with a mean free path of several micrometres, low contact resistance and large supercurrents. Such devices exhibit pronounced Fabry–P{\'e}rot oscillations not only in the normal-state resistance but also in the critical current. The proximity effect is mostly suppressed in magnetic fields below 10 mT, showing the conventional Fraunhofer pattern. Unexpectedly, some proximity survives even in fields higher than 1 T. Superconducting states randomly appear and disappear as a function of field and carrier concentration, and each of them exhibits a supercurrent carrying capacity close to the universal quantum limit. We attribute the high-field Josephson effect to mesoscopic Andreev states that persist near graphene edges. Our work reveals new proximity regimes that can be controlled by quantum confinement and cyclotron motion.",
author = "{Ben Shalom}, M. and Zhu, {M. J.} and Fal'ko, {V. I.} and A. Mishchenko and Kretinin, {A. V.} and Novoselov, {K. S.} and Woods, {C. R.} and K. Watanabe and T. Taniguchi and Geim, {A. K.} and Prance, {Jonathan Robert}",
year = "2016",
month = apr,
doi = "10.1038/nphys3592",
language = "English",
volume = "12",
pages = "318--322",
journal = "Nature Physics",
issn = "1745-2473",
publisher = "Nature Publishing Group",
number = "4",

}

RIS

TY - JOUR

T1 - Quantum oscillations of the critical current and high-field superconducting proximity in ballistic graphene

AU - Ben Shalom, M.

AU - Zhu, M. J.

AU - Fal'ko, V. I.

AU - Mishchenko, A.

AU - Kretinin, A. V.

AU - Novoselov, K. S.

AU - Woods, C. R.

AU - Watanabe, K.

AU - Taniguchi, T.

AU - Geim, A. K.

AU - Prance, Jonathan Robert

PY - 2016/4

Y1 - 2016/4

N2 - Graphene-based Josephson junctions provide a novel platform for studying the proximity effect due to graphene’s unique electronic spectrum and the possibility to tune junction properties by gate voltage. Here we describe graphene junctions with a mean free path of several micrometres, low contact resistance and large supercurrents. Such devices exhibit pronounced Fabry–Pérot oscillations not only in the normal-state resistance but also in the critical current. The proximity effect is mostly suppressed in magnetic fields below 10 mT, showing the conventional Fraunhofer pattern. Unexpectedly, some proximity survives even in fields higher than 1 T. Superconducting states randomly appear and disappear as a function of field and carrier concentration, and each of them exhibits a supercurrent carrying capacity close to the universal quantum limit. We attribute the high-field Josephson effect to mesoscopic Andreev states that persist near graphene edges. Our work reveals new proximity regimes that can be controlled by quantum confinement and cyclotron motion.

AB - Graphene-based Josephson junctions provide a novel platform for studying the proximity effect due to graphene’s unique electronic spectrum and the possibility to tune junction properties by gate voltage. Here we describe graphene junctions with a mean free path of several micrometres, low contact resistance and large supercurrents. Such devices exhibit pronounced Fabry–Pérot oscillations not only in the normal-state resistance but also in the critical current. The proximity effect is mostly suppressed in magnetic fields below 10 mT, showing the conventional Fraunhofer pattern. Unexpectedly, some proximity survives even in fields higher than 1 T. Superconducting states randomly appear and disappear as a function of field and carrier concentration, and each of them exhibits a supercurrent carrying capacity close to the universal quantum limit. We attribute the high-field Josephson effect to mesoscopic Andreev states that persist near graphene edges. Our work reveals new proximity regimes that can be controlled by quantum confinement and cyclotron motion.

U2 - 10.1038/nphys3592

DO - 10.1038/nphys3592

M3 - Letter

VL - 12

SP - 318

EP - 322

JO - Nature Physics

JF - Nature Physics

SN - 1745-2473

IS - 4

ER -