Coulomb blockade signatures of the topological phase transition in semiconductor-superconductor nanowires

Details Coulomb blockade signatures of the topological phase transition in semiconductor-superconductor nanowires Coulomb blockade signatures of the topological phase transition in semiconductor-superconductor nanowires

2011-11-28

arxiv.org/abs/1111.6527v1

Physics

Condensed Matter

Superconductivity

5 pages, 4 figures

Scientific paper

In semiconductor-superconductor hybrid structures a topological phase transition is expected as a function of chemical potential or magnetic field strength. We show that signatures of this transition can be observed in nonlinear Coulomb blockaded transport through a ring shaped structure. In particular, for a fixed electron parity of the ring, the flux periodicity of the neutral excitation spectrum changes from the usual h/2e-periodicity to a characteristic h/e-periodicity when tuning the system from the topologically trivial to 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.

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