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Time-Reversal-Invariant Z(4) Fractional Josephson Effect

PHYSICAL REVIEW LETTERS, no. 3 (2014)

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Abstract

We study the Josephson junction mediated by the quantum spin Hall edge states and show that electron-electron interactions lead to a dissipationless fractional Josephson effect in the presence of time-reversal symmetry. Surprisingly, the periodicity is 8 pi, corresponding to a Josephson frequency eV=2h We estimate the magnitude of interac...More

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fan zhang

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c l kane

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