Physics – Condensed Matter – Mesoscale and Nanoscale Physics
Scientific paper
2007-03-27
J. Phys. Soc. Jpn. 76 (2007) 043701
Physics
Condensed Matter
Mesoscale and Nanoscale Physics
10 pages, 5 figures
Scientific paper
10.1143/JPSJ.76.043701
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 $I_{\rm ex}$ at the other junction. We numerically obtain $I_{\rm ex}$ as a function of the bias voltage $V_{\rm det}$ across the detection junction. We show that $I_{\rm ex}$ at the zero bias voltage is purely determined by the charge imbalance, while the energy imbalance causes a nontrivial $V_{\rm det}$-dependence of $I_{\rm ex}$. The obtained voltage-current characteristics qualitatively agree with the experimental result by R. Yagi [Phys. Rev. B {\bf 73} (2006) 134507].
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