Influence of Charge and Energy Imbalances on the Tunneling Current through a Superconductor-Normal Metal Junction(Condensed matter: electronic structure and electrical, magnetic, and optical properties)

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We consider quasiparticle charge and energy imbalances in a thin superconductor weakly coupled with two normal-metal electrodes via tunnel junctions at low temperatures. Charge and energy imbalances, which can be created by injecting quasiparticles at one junction, induce excess tunneling current I_<ex> at the other junction. We numerically obtain I_<ex> as a function of the bias voltage V_<det> across the detection junction. We show that I_<ex> at the zero bias voltage is purely determined by the charge imbalance, while the energy imbalance causes a nontrivial V_<det>-dependence of I_<ex>. The obtained voltage-current characteristics qualitatively agree with the experimental result by R. Yagi [Phys. Rev. B 73 (2006) 134507].
社団法人日本物理学会の論文
2007-04-15