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- W2051299771 abstract "We study junctions between superconductors mediated by the edge states of a quantum-spin-Hall insulator. We show that such junctions exhibit a fractional Josephson effect, in which the current phase relation has a $4ensuremath{pi}$ rather than a $2ensuremath{pi}$ periodicity. This effect is a consequence of the conservation of fermion parity---the number of electron $text{mod}text{ }2$---in a superconducting junction and is closely related to the ${Z}_{2}$ topological structure of the quantum-spin-Hall insulator. Inelastic processes, which violate the conservation of fermion parity, lead to telegraph noise in the equilibrium supercurrent. We predict that the low-frequency noise due these processes diverges exponentially with temperature $T$ as $Tensuremath{rightarrow}0$. Possible experiments on HgCdTe quantum wells will be discussed." @default.
- W2051299771 created "2016-06-24" @default.
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- W2051299771 date "2009-04-28" @default.
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- W2051299771 title "Josephson current and noise at a superconductor/quantum-spin-Hall-insulator/superconductor junction" @default.
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- W2051299771 doi "https://doi.org/10.1103/physrevb.79.161408" @default.
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