Spontaneous Formation of a π Soliton in a Superconducting Wire with an Odd Number of Electrons
Hyok-Jon Kwon, Victor M. Yakovenko
DOI 10.1103/PhysRevLett.89.017002 · Physical Review Letters
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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 π soliton (kink) will spontaneously form in the system when the number of electrons 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 a SQUID. The two degenerate states with the current flowing clockwise or counterclockwise can be utilized as a qubit.
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