Proposed Detection of the Topological Phase in Ring-Shaped 
Semiconductor-Superconductor Nanowires Using Coulomb Blockade Transport

Zocher, B.; Horsdal, M.; Rosenow, B.

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Proposed Detection of the Topological Phase in Ring-Shaped Semiconductor-Superconductor Nanowires Using Coulomb Blockade Transport

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Rosenow, B.
Max Planck Society;

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Zocher, B., Horsdal, M., & Rosenow, B. (2012). Proposed Detection of the Topological Phase in Ring-Shaped Semiconductor-Superconductor Nanowires Using Coulomb Blockade Transport. Physical Review Letters, 109(22): 227001.

Cite as: https://hdl.handle.net/21.11116/0000-000E-C2CA-3

Abstract

In semiconductor-superconductor hybrid structures a topological phase transition is expected as a function of the chemical potential or magnetic field strength. We show that signatures of this transition can be observed in nonlinear Coulomb blockade transport through a ring shaped structure. In particular, on the scale of the superconducting gap and for a fixed electron parity of the ring, the excitation spectrum is independent of flux in the topologically trivial phase but acquires a characteristic h/e periodicity in the nontrivial phase. We relate the h/e periodicity to the recently predicted 4 pi periodicity of the Josephson current across a junction formed by two topological superconductors.