Boosting spintronics with superconductivity

Yang, Guang; Ciccarelli, Chiara; Robinson, Jason W. A.

doi:10.1063/5.0048904

Cited by 36 publications

(20 citation statements)

References 111 publications

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“…For example, the superconducting diode effect, which is the nonreciprocity of critical current, is observed in experiments [43] and it stimulates the theoretical studies very recently [45][46][47]. From the viewpoint of device application, superconducting electronics/spintronics, where supercurrent plays a principal role, is becoming an important research field [44,[49][50][51]. Thus, the importance of studying the effect of current on superconductors is increasing.…”

Section: Introductionmentioning

confidence: 96%

Supercurrent-induced topological phase transitions

Takasan,

Sumita,

Yanase

2021

Preprint

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We show that finite current in superconductors can induce topological phase transitions, as a result of the deformation of the quasiparticle spectrum by a finite center-of-mass (COM) momentum of the Cooper pairs. To show the wide applicability of this mechanism, we examine the topological properties of three prototypical systems, the Kitaev chain, s-wave superconductors, and d-wave superconductors. We introduce a finite COM momentum as an external field corresponding to supercurrent and show that all the models exhibit current-induced topological phase transitions. We also discuss the possibility of observing the phase transitions in experiments and the relation to the other finite COM momentum pairing states.

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Section: Introductionmentioning

confidence: 96%

Supercurrent-induced topological phase transitions

Takasan,

Sumita,

Yanase

2021

Preprint

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“…Those issues in spin transport have been addressed not only in normal metals but in superconductors [20]. A theory of spin current injected into superconductors by taking account of charge imbalance and spin imbalance of quasiparticles was developed in 1995 [21].…”

Section: Introductionmentioning

confidence: 99%

Fluctuation contribution to Spin Hall Effect in Superconductors

Watanabe,

Adachi,

Kato

2022

Preprint

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We theoretically study the contribution of superconducting fluctuation to extrinsic spin Hall effects in two-and three-dimensional electron gas and intrinsic spin Hall effects in two-dimensional electron gas with Rashba-type spin-orbit interaction. The Aslamazov-Larkin, Density-of-States, Maki-Thompson terms have logarithmic divergence ln in the limit = (T − Tc)/Tc → +0 in twodimensional systems for both extrinsic and intrinsic spin Hall effects except the Maki-Thompson terms in extrinsic effect, which are proportional to ( −γϕ) −1 ln with a cutoff γϕ in two-dimensional systems. We found that the fluctuation effects on the extrinsic spin Hall effect have an opposite sign to that in the normal state, while those on the intrinsic spin Hall effect have the same sign.

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“…The new system in this regards-triggered partly by the fascinating discovery of the intrinsic superconductivity in twisted BLG [19,20] and perspectives in superconducting spintronics [21][22][23][24]-is the proximity of graphene and BLG with other low-dimensional superconducting materials. There is a growing family of 2D superconductors counting topological insulators [25,26] and TMDCs [8][9][10][11]27] that, when being proximitized to single or BLG, can serve as a source of Cooper pairs.…”

Section: Introductionmentioning

confidence: 99%

Spin relaxation, Josephson effect and Yu-Shiba-Rusinov states in superconducting bilayer graphene

Barth,

Fuchs,

Kochan

2021

Preprint

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Bilayer graphene has two non-equivalent sublattices and, therefore, the same adatom impurity can manifest in spectrally distinct ways-sharp versus broad resonances near the charge neutralitydepending on the sublattice it adsorbs at. Employing Green's function analytical methods and the numerical Kwant package we investigate the spectral and transport interplay between the resonances and superconducting coherence induced in bilayer graphene by proximity to a s-wave superconductor. Analyzing doping and temperature dependencies of quasi-particle spin-relaxation rates, energies of Yu-Shiba-Rusinov states, Andreev spectra and the supercurrent characteristics of Josephson junctions we find unique superconducting signatures discriminating between resonant and off-resonant regimes. Our findings and predictions go in certain aspects beyond the specifics of the superconducting bilayer graphene and hold for generic s-wave superconductors functionalized by the resonant magnetic impurities.

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Boosting spintronics with superconductivity

Cited by 36 publications

References 111 publications

Supercurrent-induced topological phase transitions

Supercurrent-induced topological phase transitions

Fluctuation contribution to Spin Hall Effect in Superconductors

Spin relaxation, Josephson effect and Yu-Shiba-Rusinov states in superconducting bilayer graphene

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