We investigate the topological properties of a Josephson junction obtained by constraining a two-dimensional electron gas at the oxide interface to form a quasi-one-dimensional conductor. We reveal an anomalous critical current behavior with a magnetic field applied perpendicular to the Rashba spin-orbit one. We relate the observed critical current enhancement at small magnetic fields with the appearance of orbital-flavored Majorana bound states (OMBSs) pinned at the edges of the superconducting leads. Signatures of OMBSs also include a sawtooth profile in the current-phase relation. Our findings allow us to recognize fingerprints of topological superconductivity in noncentrosymmetric materials and confined systems with a spin-orbit interaction. They also explain recent experimental observations for which a microscopic description is still lacking.

Hallmarks of orbital-flavored Majorana states in Josephson junctions based on oxide nanochannels

Alfonso Maiellaro
;
Claudio Guarcello;Francesco Romeo;Roberta Citro
2023-01-01

Abstract

We investigate the topological properties of a Josephson junction obtained by constraining a two-dimensional electron gas at the oxide interface to form a quasi-one-dimensional conductor. We reveal an anomalous critical current behavior with a magnetic field applied perpendicular to the Rashba spin-orbit one. We relate the observed critical current enhancement at small magnetic fields with the appearance of orbital-flavored Majorana bound states (OMBSs) pinned at the edges of the superconducting leads. Signatures of OMBSs also include a sawtooth profile in the current-phase relation. Our findings allow us to recognize fingerprints of topological superconductivity in noncentrosymmetric materials and confined systems with a spin-orbit interaction. They also explain recent experimental observations for which a microscopic description is still lacking.
File in questo prodotto:
Non ci sono file associati a questo prodotto.

I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.

Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11386/4854319
 Attenzione

Attenzione! I dati visualizzati non sono stati sottoposti a validazione da parte dell'ateneo

Citazioni
  • ???jsp.display-item.citation.pmc??? ND
  • Scopus 2
  • ???jsp.display-item.citation.isi??? 2
social impact