Fractional Spin and Josephson Effect in Time-Reversal-Invariant Topological Superconductors.
| Autor: | Camjayi A; Departamento de Física, FCEyN, Universidad de Buenos Aires and IFIBA, Pabellón I, Ciudad Universitaria, 1428 CABA, Argentina., Arrachea L; International Center for Advanced Studies, ECyT-UNSAM, Campus Miguelete, 25 de Mayo y Francia, 1650 Buenos Aires, Argentina., Aligia A; Centro Atómico Bariloche and Instituto Balseiro, CNEA, 8400 S. C. de Bariloche, Argentina., von Oppen F; Dahlem Center for Complex Quantum Systems and Fachbereich Physik, Freie Universität Berlin, 14195 Berlin, Germany. |
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| Jazyk: | angličtina |
| Zdroj: | Physical review letters [Phys Rev Lett] 2017 Jul 28; Vol. 119 (4), pp. 046801. Date of Electronic Publication: 2017 Jul 25. |
| DOI: | 10.1103/PhysRevLett.119.046801 |
| Abstrakt: | Time-reversal-invariant topological superconducting (TRITOPS) wires are known to host a fractional spin ℏ/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 that 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-π 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. |
| Databáze: | MEDLINE |
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