Theory of a two-dimensional superconductor with broken inversion symmetry

Димитрова, О. В.; Фейгельман, М. В.

doi:10.1103/physrevb.76.014522

Cited by 154 publications

(205 citation statements)

References 20 publications

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“…2) Examples are the mixing of spin-singlet and triplet Cooper pairings, 3,4) magnetoelectric effect, [5][6][7][8] helical superconducting phase, 3,[9][10][11][12][13][14][15] and topological superconductivity. 16,17) These unconventional features result from an antisymmetric spinorbit coupling, which can be classified in various categories such as Rashba-type, Dresselhaus-type, and cubic-type.…”

Section: Introductionmentioning

confidence: 99%

Complex-Stripe Phases Induced by Staggered Rashba Spin–Orbit Coupling

2013

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We study superconducting phases in a quasi-two-dimensional multilayer system without local inversion symmetry. Broken local inversion symmetry induces layer-dependent Rashba-type spin-orbit couplings. We find that a complex-stripe phase, which is the intermediate phase between the Fulde-Ferrell (FF) phase and Larkin-Ovchinnikov (LO) phase, is realized in the magnetic field applied parallel to the layers. A crossover from the FF phase to the LO phase appears by tuning temperature and magnetic field. We show the local density of states that characterizes the complex-stripe phase. As a possible realization of the complex-stripe phase, we discuss the artificial superlattices of CeCoIn 5 .

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Section: Introductionmentioning

confidence: 99%

Complex-Stripe Phases Induced by Staggered Rashba Spin–Orbit Coupling

2013

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“…Naively, the magnetism should destroy the superconductivity. However, the strong spin-orbit coupling of the interface electrons allows these two competing phenomena to coexist peacefully 23 (see also [10]). Spin-orbit coupling mixes s-wave and p-wave superconductivity, so that the swave superconductivity which is present in the droplets in STO can induce a mixture of s-wave and p-wave superconductivity at the interface.…”

Section: Introductionmentioning

confidence: 99%

“…A basic question, then, is whether the same electrons are exhibiting both superconductivity and magnetism or if, instead, there is a precise sense in which there are two species of electrons -two different electronic bands, for instance -one of which is superconducting and the other of which is magnetic. In the former case, the superconductivity must be exotic, perhaps p-wave superconductivity or a Fulde-Ferrel-Larkin-Ovchinnikov (FFLO) state [8][9][10][11] . This would contradict the conventional wisdom that the interface electrons are simply exhibiting the superconductivity of doped SrTiO 3 , which is presumed to be a phononmediated s-wave superconductor.…”

Section: Introductionmentioning

confidence: 99%

Magnetic and superconducting ordering in one-dimensional nanostructures at the LaAlO3/SrTiO3interface

et al. 2013

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We formulate a model for magnetic and superconducting ordering in one-dimensional nanostructures at LaAlO3/SrTiO3 interfaces containing both localized magnetic moments and itinerant electrons. Though these both originate in Ti 3d orbitals, the former may be due to electrons more tightly-bound to the interface while the latter are extended over several layers. Only the latter contribute significantly to metallic conduction and superconductivity. In our model, the interplay between the two types of electrons, which is argued to be ferromagnetic, combined with strong spin-orbit coupling of the itinerant electrons, leads to magnetic ordering. Furthermore, we propose a model for interfacial superconductivity, consisting of random superconducting grains in the bulk STO driven, via coupling to the interface conduction band, towards long-ranged or quasi-long-ranged order. Most interestingly, the magnetic order and strong spin orbit coupling can lead in this manner to unconventional interfacial superconductivity, yielding a possible realization of Majorana physics.

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“…6,7) This FuldeFerrell-Larkin-Ovchinnikov-like state is easily destroyed by disorder. 8,9) Instead, a different inhomogeneous superconducting state appears, which is called the long-wavelength helical state. 8,9) Here the Cooper pairs have a very small but nonzero momentum q and the order parameter varies as exp(iq · r).…”

Section: Introductionmentioning

confidence: 99%

“…8,9) Instead, a different inhomogeneous superconducting state appears, which is called the long-wavelength helical state. 8,9) Here the Cooper pairs have a very small but nonzero momentum q and the order parameter varies as exp(iq · r). Very recently, the present authors studied the effect of a parallel magnetic field H on the superconductivity of monolayer Pb films on GaAs(110).…”

Section: Introductionmentioning

confidence: 99%

Effect of Parallel Magnetic Field on Superconductivity of Ultrathin Metal Films Grown on a Cleaved GaAs Surface

et al. 2015

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The parallel-magnetic-field H dependence of the superconducting transition temperature T c is studied for ultrathin films of In, Bi, and Al grown on GaAs(110). In the case of In films in the monolayer regime, T c exhibits a quadratic-like H dependence, which is one order of magnitude stronger than that previously observed in monolayer Pb films by the present authors [Phys. Rev. Lett. 111, 057005 (2013)]. The results are well reproduced by a model developed for an inhomogeneous two-dimensional superconducting state in the presence of a moderate Rashba spin-orbit interaction. The Rashba spin splitting is estimated to be 0.04 eV, which is much smaller than that expected for monolayer Pb films. In a few-monolayer Bi film, the suppression of T c with increasing H is comparable to that in monolayer Pb films. On the other hand, much stronger suppression, which is attributed to the Pauli paramagnetic effect, was observed for the Al film.

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Theory of a two-dimensional superconductor with broken inversion symmetry

Cited by 154 publications

References 20 publications

Complex-Stripe Phases Induced by Staggered Rashba Spin–Orbit Coupling

Complex-Stripe Phases Induced by Staggered Rashba Spin–Orbit Coupling

Magnetic and superconducting ordering in one-dimensional nanostructures at the LaAlO3/SrTiO3interface

Effect of Parallel Magnetic Field on Superconductivity of Ultrathin Metal Films Grown on a Cleaved GaAs Surface

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