Josephson effect in graphene superconductor/barrier/superconductor junctions: oscillatory behavior of the Josephson current
Josephson effect in graphene superconductor/barrier/superconductor junctions: oscillatory behavior of the Josephson current
复制标题
DOI：
10.1103/physrevb.76.054513
复制
发表时间：
2007-08
影响因子：
3.7
通讯作者：
M. Maiti;K. Sengupta
中科院分区：
文献类型：
--
作者：
M. Maiti;K. Sengupta
We study Josephson effect in graphene superconductor/barrier/superconductor junctions with short and wide barriers of thickness $d$ and width $L$, which can be created by applying a gate voltage ${V}_{0}$ across the barrier region. We show that Josephson current in such graphene junctions, in complete contrast to their conventional counterparts, is an oscillatory function of both the barrier width $d$ and the applied gate voltage ${V}_{0}$. We also demonstrate that in the thin barrier limit, where ${V}_{0}\ensuremath{\rightarrow}\ensuremath{\infty}$ and $d\ensuremath{\rightarrow}0$ keeping ${V}_{0}d$ finite, such an oscillatory behavior can be understood in terms of transmission resonance of Dirac\char21{}Bogoliubov\char21{}de Gennes quasiparticles in superconducting graphene. We discuss experimental relevance of our work.
We study Josephson effect in graphene superconductor/barrier/superconductor junctions with short and wide barriers of thickness $d$ and width $L$, which can be created by applying a gate voltage ${V}_{0}$ across the barrier region. We show that Josephson current in such graphene junctions, in complete contrast to their conventional counterparts, is an oscillatory function of both the barrier width $d$ and the applied gate voltage ${V}_{0}$. We also demonstrate that in the thin barrier limit, where ${V}_{0}\ensuremath{\rightarrow}\ensuremath{\infty}$ and $d\ensuremath{\rightarrow}0$ keeping ${V}_{0}d$ finite, such an oscillatory behavior can be understood in terms of transmission resonance of Dirac\char21{}Bogoliubov\char21{}de Gennes quasiparticles in superconducting graphene. We discuss experimental relevance of our work.