Multiple Andreev reflections in a quantum dot coupled to superconductors: Effects of spin-orbit coupling

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dc.creatorDolcini, Fabrizio
dc.creatorDell'Anna, Luca
dc.date2008-04-03
dc.date2008-10-22
dc.date.accessioned2026-07-07T10:11:55Z
dc.date.available2026-07-07T10:11:55Z
dc.descriptionWe study the out-of-equilibrium current through a multilevel quantum dot contacted to two superconducting leads and in the presence of Rashba and Dresselhaus spin-orbit couplings, in the regime of strong dot-lead coupling. The multiple Andreev reflection (MAR) subgap peaks in the current voltage characteristics are found to be modified (but not suppressed) by the spin-orbit interaction, in a way that strongly depends on the shape of the dot confining potential. In a perfectly isotropic dot the MAR peaks are enhanced when the strength $α_R$ and $α_D$ of Rashba and Dresselhaus terms are equal. When the anisotropy of the dot confining potential increases the dependence of the subgap structure on the spin-orbit angle $θ=\arctan(α_D/α_R)$ decreases. Furthermore, when an in-plane magnetic field is applied to a strongly anisotropic dot, the peaks of the non-linear conductance oscillate as a function of the magnetic field angle, and the location of the maxima and minima allows for a straightforward read-out of the spin-orbit angle $θ$.
dc.descriptionFinal version published in Phys. Rev. B. (typos corrected; more details specified in the text and in the abstract; color scale of Fig.9 improved)
dc.identifierhttps://arxiv.org/abs/0804.0591
dc.identifierhttp://arxiv.org/abs/0804.0591
dc.identifierPhys. Rev. B 78, 024518 (2008)
dc.identifierdoi:10.1103/PhysRevB.78.024518
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/172013
dc.subjectMesoscale and Nanoscale Physics
dc.subjectSuperconductivity
dc.titleMultiple Andreev reflections in a quantum dot coupled to superconductors: Effects of spin-orbit coupling
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