Speaker
Mats Horsdal
(Leipzig University)
Description
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, 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?-periodicity of the Josephson current
across a junction formed by two topological
superconductors.
