Controllable 0−π Transition in a Superconducting Graphene-Nanoribbon Junction
Qifeng Liang, Yong Yu, Qianghua Wang, Jinming Dong
DOI 10.1103/PhysRevLett.101.187002 · Physical Review Letters
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Abstract
The supercurrent in a Josephson junction composed of the zigzag edged graphene nanoribbon (ZGNR) lying between two superconducting leads [superconductor-graphene-superconductor (SGS) junction] has been studied by the Green’s function method. It is found that a small transverse electric field applied on the ZGNR can reverse the supercurrent direction, leading to a so-called 0−π phase transition. The 0−π phase transition can happen periodically with a change in the ZGNR’s length, and, more importantly, can be easily and electrically controllable by a gate voltage, which is absent in the conventional superconducting π junction and would make the SGS junction very promising for future application in superconducting electronics, as well as quauntum information and computation.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Nb Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
| CuxNi1-x Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
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