Creation of Spin-Triplet Cooper Pairs in the Absence of Magnetic Ordering

Breunig, Daniel; Burset, Pablo; Trauzettel, Björn

doi:10.1103/physrevlett.120.037701

Cited by 49 publications

(34 citation statements)

References 58 publications

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“…In this regard, it is important to men-tion that even such odd-frequency pair correlations can arise due to intrinsic properties of the system, as found for example in multiband superconductors, [3][4][5][6][7] or even due to more exotic mechanisms. 2, [8][9][10][11][12] Odd-frequency pairing has also been extensively studied in hybrid systems that include superconductorferromagnet junctions, normal-superconducror (NS) junctions, 21,[40][41][42][43][44][45][46][47][48] topological insulators-superconductor junctions, [49][50][51][52][53][54][55][56][57][58] as well as in inhomogeneous systems under time-dependent fields. 59,60 In NS junctions, oddfrequency pairing is generated due to the interface breaking the spatial parity, which allows the transformation from even s-wave to odd p-wave symmetry, while conserving the spin structure.…”

Section: Introductionmentioning

confidence: 99%

Odd-frequency superconducting pairing in junctions with Rashba spin-orbit coupling

Cayao

Black‐Schaffer

2018

Phys. Rev. B

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We consider normal-superconductor (NS) and superconductor-normal-superconductor (SNS) junctions based on one-dimensional nanowires with Rashba spin-orbit coupling and proximityinduced s-wave spin-singlet superconductivity and analytically demonstrate how both even-and odd-frequency and spin-singlet and -triplet superconducting pair correlations are always present. In particular, by using a fully quantum mechanical scattering approach, we show that Andreev reflection induces mixing of spatial parities at interfaces, thus being the unique process which generates odd-frequency pairing; on the other hand, both Andreev and normal reflections contribute to even-frequency pairing. We further find that locally neither odd-frequency nor spin-triplet correlations are induced, but only even-frequency spin-singlet pairing. In the superconducting regions of NS junctions, the interface-induced amplitudes decay into the bulk, with the odd-frequency components being generally much larger than the even-frequency components at low frequencies. The odd-frequency pairing also develops short and long-period oscillations due to the chemical potential and spin-orbit coupling, respectively, leading to a visible beating feature in their magnitudes. Moreover, we find that in short SNS junctions at π-phase difference and strong spin-orbit coupling, the odd-frequency spin-singlet and -triplet correlations strongly dominate with an alternating spatial pattern for a large range of sub-gap frequencies.arXiv:1805.07948v2 [cond-mat.mes-hall]

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Section: Introductionmentioning

confidence: 99%

Odd-frequency superconducting pairing in junctions with Rashba spin-orbit coupling

Cayao

Black‐Schaffer

2018

Phys. Rev. B

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“…The two Andreev reflections are qualitatively different: whereas the Andreev reflection within the same band is a retro‐reflection process, the inter‐band Andreev process is a specular reflection, similarly to the one predicted in single‐ and bilayer graphene, Weyl SM, and 3D topological insulators . The main difference is that in our hybrid junction, the two Andreev processes take place at the same energy, whereas in chiral SMs it is either a retro‐ or a specular‐reflection process.…”

Section: Model and Formalismmentioning

confidence: 49%

Quantum Transport Properties of an Exciton Insulator/Superconductor Hybrid Junction

2018

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A theoretical study of electronic transport in a hybrid junction consisting of an excitonic insulator sandwiched between a normal and a superconducting electrode is presented. The normal region is described as a two‐band semi‐metal and the superconducting lead as a two‐band superconductor. In the excitonic insulator region, the coupling between carriers in the two bands leads to an excitonic condensate and a gap Γ in the quasi‐particle spectrum. Four different scattering processes at both interfaces are identified: Two types of normal reflection, intra‐ and inter‐band; and two different Andreev reflections, one retro‐reflective within the same band and one specular reflective between the two bands. The differential conductance of the structure is calculated and the existence of a minimum at voltages of the order of the excitonic gap is shown. The findings are useful toward the detection of the excitonic condensate and provide a plausible explanation for recent transport experiments on HgTe quantum wells and InAs/GaSb bilayer systems.

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“…Moreover, when proximitized with s-wave superconductors and eventually ferromagnetic barriers, spin-momentum locked systems can develop topological [10,11,12,13,14] and odd frequency [15,16,17,18,19,20,21,22,23,24] superconductivity. This opens the way to potential applications in superconducting spintronics [25,26]. Moreover, through the generation of Majorana zero energy bound states [10,11] and, for strong electronelectron interactions [27,28,29], parafermions [30,31,32], topological heterostructures can be useful in topological quantum computation [33].…”

Section: Introductionmentioning

confidence: 99%

The invisible Majorana bound state at the helical edge

Fleckenstein

Keidel

Trauzettel

et al. 2018

Eur. Phys. J. Spec. Top.

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The presence of a Majorana bound state in condensed matter systems is often associated to a zero bias peak in conductance measurements. Here, we analyze a system were this paradigm is violated. A Majorana bound state is always present at the interface between a quantum spin Hall system that is magnetically gapped and a quantum spin Hall system gapped by proximity induced s-wave superconductivity. However, the linear conductance could be either zero or nonzero and quantized depending on the energy and length scales of the barriers. The transition between the two values is reminiscent of the topological phase transition in proximitized spin-orbit coupled quantum wires in the presence of an applied magnetic field. We interpret the behavior of the conductance in terms of scattering states at both zero and non-zero energy. arXiv:1805.08556v1 [cond-mat.mes-hall]

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Creation of Spin-Triplet Cooper Pairs in the Absence of Magnetic Ordering

Cited by 49 publications

References 58 publications

Odd-frequency superconducting pairing in junctions with Rashba spin-orbit coupling

Odd-frequency superconducting pairing in junctions with Rashba spin-orbit coupling

Quantum Transport Properties of an Exciton Insulator/Superconductor Hybrid Junction

The invisible Majorana bound state at the helical edge

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