Complete gate control of supercurrent in graphene p–n junctions

Jae-Hyun Choi, Gil-Ho Lee, Sunghun Park, Dongchan Jeong, Jeong-O Lee, H.-S. Sim (), Yong-Joo Doh () and Hu-Jong Lee
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Jae-Hyun Choi: Pohang University of Science and Technology
Gil-Ho Lee: Pohang University of Science and Technology
Sunghun Park: Korea Advanced Institute of Science and Technology
Dongchan Jeong: Pohang University of Science and Technology
Jeong-O Lee: NanoBio Fusion Research Center, Korea Research Institute of Chemical Technology
H.-S. Sim: Korea Advanced Institute of Science and Technology
Yong-Joo Doh: Pohang University of Science and Technology
Hu-Jong Lee: Pohang University of Science and Technology

Nature Communications, 2013, vol. 4, issue 1, 1-10

Abstract: Abstract In a conventional Josephson junction of graphene, the supercurrent is not turned off even at the charge neutrality point, impeding further development of superconducting quantum information devices based on graphene. Here we fabricate bipolar Josephson junctions of graphene, in which a p–n potential barrier is formed in graphene with two closely spaced superconducting contacts, and realize supercurrent ON/OFF states using electrostatic gating only. The bipolar Josephson junctions of graphene also show fully gate-driven macroscopic quantum tunnelling behaviour of Josephson phase particles in a potential well, where the confinement energy is gate tuneable. We suggest that the supercurrent OFF state is mainly caused by a supercurrent dephasing mechanism due to a random pseudomagnetic field generated by ripples in graphene, in sharp contrast to other nanohybrid Josephson junctions. Our study may pave the way for the development of new gate-tuneable superconducting quantum information devices.

Date: 2013
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DOI: 10.1038/ncomms3525

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