Josephson supercurrent in a graphene-superconductor junction
Josephson supercurrent in a graphene-superconductor junction
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DOI：
10.1103/physrevb.85.024513
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发表时间：
2011-07
影响因子：
3.7
通讯作者：
E. Sarvestani;S. Jafari
中科院分区：
文献类型：
--
作者：
E. Sarvestani;S. Jafari
Within the tunneling Hamiltonian formulation for the eight-component spinors,the Josephson critical super-current has been calculated in a planar superconductor-normal graphene-superconductor junction. Coupling between superconductor regions and graphene is taken into account by a tunneling Hamiltonian which contains two types of tunneling, intra-valley and inter-valley tunneling. Within the present tunneling approach, we find that the contributions of two kinds of tunneling to the critical super-current, are completely separable. Therefore, it is possible to consider the effect of the inter-valley tunnelings in the critical super-current. The incorporation of these type of processes into the tunneling Hamiltonian, exposes a special feature of the graphene Josephson junctions. The effect of inter-valley tunneling appears in the length dependence plot of critical current in the form of oscillations. We also present the results for temperature dependence of critical super-current and compare with experimental results and other theoretical calculations.
