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Probing Topological Superconductivity of oxide nanojunctions using fractional Shapiro steps

Author

Listed:
  • Guarcello, Claudio
  • Maiellaro, Alfonso
  • Settino, Jacopo
  • Gaiardoni, Irene
  • Trama, Mattia
  • Romeo, Francesco
  • Citro, Roberta

Abstract

We theoretically discuss the emergence of fractional Shapiro steps in a Josephson junction created by confining a two-dimensional electron gas at an oxide interface. This phenomenon is induced by an alternating current of proper amplitude and frequency and can be tuned by a magnetic field applied perpendicular to the Rashba spin–orbit axis. The presence of fractional Shapiro steps can be associated with the creation of Majorana bound states at the boundaries of the superconducting leads. Our findings represent a route for the identification of topological superconductivity in non-centrosymmetric materials and confined systems in the presence of spin–orbit interaction, offering also new insights into recently explored frameworks.

Suggested Citation

  • Guarcello, Claudio & Maiellaro, Alfonso & Settino, Jacopo & Gaiardoni, Irene & Trama, Mattia & Romeo, Francesco & Citro, Roberta, 2024. "Probing Topological Superconductivity of oxide nanojunctions using fractional Shapiro steps," Chaos, Solitons & Fractals, Elsevier, vol. 189(P1).
    • Handle: RePEc:eee:chsofr:v:189:y:2024:i:p1:s0960077924011482
    DOI: 10.1016/j.chaos.2024.115596
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    References listed on IDEAS

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    1. J. Tiira & E. Strambini & M. Amado & S. Roddaro & P. San-Jose & R. Aguado & F. S. Bergeret & D. Ercolani & L. Sorba & F. Giazotto, 2017. "Magnetically-driven colossal supercurrent enhancement in InAs nanowire Josephson junctions," Nature Communications, Nature, vol. 8(1), pages 1-9, April.
    2. Gil-Ho Lee & Sol Kim & Seung-Hoon Jhi & Hu-Jong Lee, 2015. "Ultimately short ballistic vertical graphene Josephson junctions," Nature Communications, Nature, vol. 6(1), pages 1-9, May.
    3. Arjun Joshua & S. Pecker & J. Ruhman & E. Altman & S. Ilani, 2012. "A universal critical density underlying the physics of electrons at the LaAlO3/SrTiO3 interface," Nature Communications, Nature, vol. 3(1), pages 1-7, January.
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