Effect of Quantum Fluctuation on the Andreev Reflection : Condensed Matter: Electronic Properties, etc.
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概要
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We investigate the dynamical quantum fluctuation effect on an Andreev current through an ultrasmall Superconductor in the Coulomb blockade regime. We calculate the current using a phenomenological gauge invariant model and the real-time path-integral method. We choose a special gauge which absorbs the scalar potential to convert the phase of a superconductor as a dynamical variable. A zero-energy phase fluctuation of the superconductor suppresses the Andreev current at low bias voltage. This suppression is expected to be observed in samples with large level spacing and small charging energy which allow the coexistence of a large quantum fluctuation and Andreev reflection process.
- 社団法人日本物理学会の論文
- 2000-09-15
著者
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Utsumi Yasuhiro
Graduate School Of Information Sciences Tohoku University
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HAYASHI Masahiko
Graduate School of Science, Fukuoka University
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EBISAWA Hiromichi
Graduate School of Information Sciences, Tohoku University
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Ebisawa Hiromichi
Graduate School Of Information Sciences Tohoku University
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Hayashi Masahiko
Graduate School Of Information Sciences Tohoku University
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