We investigate the transport properties of a bilayer exciton condensate that is contacted by four superconducting leads. We focus on the equilibrium regime and investigate how the Josephson currents induced in the bilayer by phase biases applied to the superconducting electrodes are affected by the presence of an exciton condensate in the bulk of the system. As long as the distance between the superconducting electrodes is much larger than the exciton coherence length, the Josephson current depends only on the difference between the phase biases in the two layers. This result holds true in both short- and long-junction limits. We relate it to a new correlated four-particle Andreev process, which occurs at the superconductor/exciton-condensate interface. The system we investigate provides an implementation of the supercurrent mirror proposed by Kitaev as a viable way to realize topologically protected qubits. © 2011 American Physical Society.

Josephson current in a four-terminal superconductor/exciton-condensate/ superconductor system / Peotta, S.; Gibertini, M.; Dolcini, F.; Taddei, F.; Polini, M.; Ioffe, L. B.; Fazio, R.; Macdonald, A. H.. - In: PHYSICAL REVIEW. B, CONDENSED MATTER AND MATERIALS PHYSICS. - ISSN 1098-0121. - 84:18(2011), pp. 184528-184548. [10.1103/PhysRevB.84.184528]

Josephson current in a four-terminal superconductor/exciton-condensate/ superconductor system

Gibertini M.;
2011

Abstract

We investigate the transport properties of a bilayer exciton condensate that is contacted by four superconducting leads. We focus on the equilibrium regime and investigate how the Josephson currents induced in the bilayer by phase biases applied to the superconducting electrodes are affected by the presence of an exciton condensate in the bulk of the system. As long as the distance between the superconducting electrodes is much larger than the exciton coherence length, the Josephson current depends only on the difference between the phase biases in the two layers. This result holds true in both short- and long-junction limits. We relate it to a new correlated four-particle Andreev process, which occurs at the superconductor/exciton-condensate interface. The system we investigate provides an implementation of the supercurrent mirror proposed by Kitaev as a viable way to realize topologically protected qubits. © 2011 American Physical Society.
2011
84
18
184528
184548
Josephson current in a four-terminal superconductor/exciton-condensate/ superconductor system / Peotta, S.; Gibertini, M.; Dolcini, F.; Taddei, F.; Polini, M.; Ioffe, L. B.; Fazio, R.; Macdonald, A. H.. - In: PHYSICAL REVIEW. B, CONDENSED MATTER AND MATERIALS PHYSICS. - ISSN 1098-0121. - 84:18(2011), pp. 184528-184548. [10.1103/PhysRevB.84.184528]
Peotta, S.; Gibertini, M.; Dolcini, F.; Taddei, F.; Polini, M.; Ioffe, L. B.; Fazio, R.; Macdonald, A. H.
File in questo prodotto:
Non ci sono file associati a questo prodotto.
Pubblicazioni consigliate

Licenza Creative Commons
I metadati presenti in IRIS UNIMORE sono rilasciati con licenza Creative Commons CC0 1.0 Universal, mentre i file delle pubblicazioni sono rilasciati con licenza Attribuzione 4.0 Internazionale (CC BY 4.0), salvo diversa indicazione.
In caso di violazione di copyright, contattare Supporto Iris

Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11380/1186479
Citazioni
  • ???jsp.display-item.citation.pmc??? ND
  • Scopus 20
  • ???jsp.display-item.citation.isi??? 20
social impact