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Foto: Prof. Liliana Arrachea [courtesy Universidad de Buenos Aires, Argentina]

- 03.11.2017 - Nest Seminar Liliana ArracheaNEST Seminar Friday 3 November 2017 - 11:00 Venue: NEST seminar room Speaker: Liliana Arrachea Affiliation: Departamento de Fisica, Universidad de Buenos Aires, Argentina Title: “Fractional spin and Josephson effect in time-reversal-invariant topological superconductors” Abstract: Time reversal invariant topological superconducting (TRITOPS) wires are known to host a fractional spin hbar/4 at their ends. We investigate how this fractional spin affects the Josephson current in a TRITOPS-quantum dot-TRITOPS Josephson junction, describing the wire in a model which can be tuned between a topological and a nontopological phase. We compute the equilibrium Josephson current of the full model by continuous-time Monte Carlo simulations and interpret the results within an effective low-energy theory. We show that in the topological phase, the 0-to-pi transition is quenched via formation of a spin singlet from the quantum dot spin and the fractional spins associated with the two adjacent topological superconductors.

Info fabio.taddei@nano.cnr.it

Link https://www.pks.mpg.de/~arrachea/