Proximity effect in the presence of Coulomb interaction and magnetic field

Simple item page
dc.creatorOstrovsky, P. M.
dc.creatorFominov, Ya. V.
dc.creatorFeigel'man, M. V.
dc.date2006-01-31
dc.date2006-09-14
dc.date.accessioned2026-07-07T06:57:51Z
dc.date.available2026-07-07T06:57:51Z
dc.descriptionWe consider a small metallic grain coupled to a superconductor by a tunnel contact. We study the interplay between proximity and charging effects in the presence of the external magnetic field. Employing the adiabatic approximation we develop a self-consistent theory valid for an arbitrary ratio of proximity and Coulomb strength. The magnetic field suppresses the proximity-induced minigap in an unusual way. We find the phase diagram of the grain in the charging energy - magnetic field plane. Two distinct states exist with different values and magnetic field dependences of the minigap. The first-order phase transition occurs between these two minigapped states. The transition to the gapless state may occur by the first- or second-order mechanism depending on the charging energy. We also calculate the tunneling density of states in the grain. The energy dependence of this quantity demonstrates two different gaps corresponding to the Coulomb and proximity effects. These gaps may be separated in sufficiently high magnetic field.
dc.description11 pages (including 8 EPS figures). Version 3: extended. Final version as published in PRB
dc.identifierhttps://arxiv.org/abs/cond-mat/0601694
dc.identifierhttp://arxiv.org/abs/cond-mat/0601694
dc.identifierPhys. Rev. B 74, 104505 (2006)
dc.identifierdoi:10.1103/PhysRevB.74.104505
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/107129
dc.subjectSuperconductivity
dc.subjectMesoscale and Nanoscale Physics
dc.titleProximity effect in the presence of Coulomb interaction and magnetic field
dc.typetext

Files

Collections

arXiv