Charge fluctuation between even and odd states of a superconducting island
Yasuhiro Utsumi, Hiroshi Imamura, Masahiko Hayashi, Hiromichi Ebisawa
DOI 10.1103/PhysRevB.66.024513 · Physical Review B
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Abstract
We theoretically investigate effects of quantum fluctuation between an even and an odd charge state on the transport properties of a normal-superconducting-normal–single-electron tunneling transistor. The charge fluctuation is discussed beyond the orthodox theory. We find that the charging energy renormalization enhances the parity effect: The Coulomb blockade regime for the odd state is reduced and that for the even state is widened. We show that the renormalization factor can be obtained experimentally and that the renormalization effect is weakened by applied bias voltage.
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