| CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES |
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Josephson Effect in Graphene: Comparison of Real and Pseudo Vector Potential Barriers |
| Tatnatchai Suwannasit1, Rassmidara Hoonsawat1, I-Ming Tang1,3, Bumned Soodchomshom2** |
1Department of Physics, Faculty of Science, Mahidol University, Bangkok 10400, Thailand
2Department of Physics, Faculty of Science, Kasetsart University, Bangkok 10900, Thailand
3Department of Material Science, Faculty of Science, Kasetsart University, Bangkok 10900, Thailand
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| Cite this article: |
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Tatnatchai Suwannasit, Rassmidara Hoonsawat, I-Ming Tang et al 2014 Chin. Phys. Lett. 31 037401 |
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Abstract The Josephson currents through real vector potential (RVP) and pseudo vector potential (PVP) barriers in graphene are investigated. In graphene, the pseudo vector potential may be caused by a local strain. The comparison of supercurrents induced by the two type-barriers is focused. As a result, we find that not only will the RVP induce a transition Josephson current from the 0→π state but also causes the difference in the phases of the order parameters of the two superconducting graphene layers to shift from φ→2φ. The critical current is PVP-independent around the neutrality point while it strongly depends on the RVP. The vector potential dependence of critical current is found to be perfectly linear for both PVP and RVP barriers.
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Received: 15 August 2013
Published: 28 February 2014
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| PACS: |
74.50.+r
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(Tunneling phenomena; Josephson effects)
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81.05.ue
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(Graphene)
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07.10.Pz
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(Instruments for strain, force, and torque)
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