Spontaneous formation of a pi soliton in a superconducting wire with an odd number of electrons

Hyok-Jon Kwon; Victor M. Yakovenko

doi:10.1103/physrevlett.89.017002

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Spontaneous formation of a pi soliton in a superconducting wire with an odd number of electrons

Hyok-Jon Kwon·Victor M. Yakovenko

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Abstract

We consider a one-dimensional superconducting wire where the total number of electrons can be controlled in the Coulomb blockade regime. We predict that a pi soliton (kink) will spontaneously form in the system when the number of electron is odd, because this configuration has a lower energy. If the wire with an odd number of electrons is closed in a ring, the phase difference on the two sides of the soliton will generate a supercurrent detectable by SQUID. The two degenerate states with the current flowing clockwise or counterclockwise can be utilized as a qubit.

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Hyok-Jon Kwon, Victor M. Yakovenko. 2002-06-07. Spontaneous formation of a pi soliton in a superconducting wire with an odd number of electrons. https://doi.org/10.1103/physrevlett.89.017002

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