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Abstract:

Time-reversal-invariant topological superconducting (TRITOPS) wires are known to host a fractional spin /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. © 2017 American Physical Society.

Registro:

Documento: Artículo
Título:Fractional Spin and Josephson Effect in Time-Reversal-Invariant Topological Superconductors
Autor:Camjayi, A.; Arrachea, L.; Aligia, A.; Von Oppen, F.
Filiación:Departamento de Física, FCEyN, Universidad de Buenos Aires, IFIBA, Ciudad Universitaria, Pabellón I, Caba, 1428, Argentina
International Center for Advanced Studies, ECyT-UNSAM, Campus Miguelete, 25 de Mayo y Francia, Buenos Aires, 1650, Argentina
Centro Atómico Bariloche and Instituto Balseiro, CNEA, S. C. de Bariloche, 8400, Argentina
Dahlem Center for Complex Quantum Systems and Fachbereich Physik, Freie Universität Berlin, Berlin, 14195, Germany
Palabras clave:Josephson junction devices; Monte Carlo methods; Quantum optics; Semiconductor quantum dots; Superconducting materials; Continuous-time; Fractional spin; Josephson current; Josephson effect; Josephson-junction; Quantum dot spins; Spin singlets; Topological phase; Topology
Año:2017
Volumen:119
Número:4
DOI: http://dx.doi.org/10.1103/PhysRevLett.119.046801
Título revista:Physical Review Letters
Título revista abreviado:Phys Rev Lett
ISSN:00319007
CODEN:PRLTA
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00319007_v119_n4_p_Camjayi

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Citas:

---------- APA ----------
Camjayi, A., Arrachea, L., Aligia, A. & Von Oppen, F. (2017) . Fractional Spin and Josephson Effect in Time-Reversal-Invariant Topological Superconductors. Physical Review Letters, 119(4).
http://dx.doi.org/10.1103/PhysRevLett.119.046801
---------- CHICAGO ----------
Camjayi, A., Arrachea, L., Aligia, A., Von Oppen, F. "Fractional Spin and Josephson Effect in Time-Reversal-Invariant Topological Superconductors" . Physical Review Letters 119, no. 4 (2017).
http://dx.doi.org/10.1103/PhysRevLett.119.046801
---------- MLA ----------
Camjayi, A., Arrachea, L., Aligia, A., Von Oppen, F. "Fractional Spin and Josephson Effect in Time-Reversal-Invariant Topological Superconductors" . Physical Review Letters, vol. 119, no. 4, 2017.
http://dx.doi.org/10.1103/PhysRevLett.119.046801
---------- VANCOUVER ----------
Camjayi, A., Arrachea, L., Aligia, A., Von Oppen, F. Fractional Spin and Josephson Effect in Time-Reversal-Invariant Topological Superconductors. Phys Rev Lett. 2017;119(4).
http://dx.doi.org/10.1103/PhysRevLett.119.046801