Intrinsic Superconducting Diode Effect

Daido, Akito; Ikeda, Yuhei; Yanase, Youichi

doi:10.1103/physrevlett.128.037001

Cited by 201 publications

(123 citation statements)

References 55 publications

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“…Discussions and concluding remarks: In this paper, we have shown that an out-of-plane electric field and magnetic field induced spin-polarized PDW order can arise in the twisted bilayer TMD system, which is the unique ground state. This PDW state supports nonzero spin-polarized SC diode current due to the absence of inversion symmetry[See 3(e) for clarity], similar to the superconducting diode effect (SDE) of the Flude-Fellel state [99], and can thus be directly probed using the SDE experiment [100][101][102]. We also find various topological chiral SC states in this system with the Chern number |N | = 1, 2, 4.…”

Section: Modelsupporting

confidence: 61%

Pair-density-wave and chiral superconductivity in twisted bilayer transition-metal-dichalcogenides

Wu¹,

Wu²,

Ye³

2022

Preprint

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We theoretically explore possible unconventional superconductivity induced by weak repulsive interactions in twisted bilayer TMD (e.g. WSe2) in the presence of an out-of-plane electric field. Using renormalization group (RG) analysis, we show that topological chiral superconducting states with Chern number N = 1, 2, 4 (namely p+ip, d+id, g+ig) appear over a large parameter region with moiré filling factor around n = 1. At some special values of applied electric field and in the presence of a weak out-of-plane Zeeman field, spin-polarized pair density wave (PDW) superconductivity can emerge. This spin-polarized PDW state can be probed by experiments such as spin-polarized STM measuring spin-resolved pairing gap and quasi-particle interference. Moreover, the spin-polarized PDW could lead to spin-polarized superconducting diode effect.

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Section: Modelsupporting

confidence: 61%

Pair-density-wave and chiral superconductivity in twisted bilayer transition-metal-dichalcogenides

Wu¹,

Wu²,

Ye³

2022

Preprint

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“…When we were finalizing our manuscript, we noticed a recent work [42] on a related topic and were informed that another group [43] had been working on a similar problem.…”

Section: Discussionmentioning

confidence: 99%

A phenomenological theory of superconductor diodes

2022

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Nonreciprocal responses in noncentrosymmetric systems contain a broad range of phenomena. Especially, non-dissipative and coherent nonreciprocal transport in solids is an important fundamental issue. The recent discovery of superconductor diodes under external magnetic fields, where the magnitude of the critical current changes as the direction is reversed, significantly boosted this research area. However, a theoretical understanding of such phenomena is lacking. Here, we provide theoretical descriptions of superconductor diodes with a generalized Ginzburg-Landau method. The theory is applied to Rashba spin-orbit coupled systems, where analytical relations between the nonreciprocal critical currents and the system parameters are achieved. Numerical calculations with mean-field theory are also obtained to study broader parameter regions. These results offer a rather general description and design principles of superconductor diodes.

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“…The effects are being actively studied during the last few years. The superconducting diode effect has been predicted for homogeneous materials with SOC and finite-momentum helical ground state [51][52][53][54][55] , S/F bilayers with interface spin-orbit coupling 56 and for Josephson junctions 28,57,58 . It has been also observed in superconducting films, layered systems without a centre of inversion [59][60][61] and Josephson junctions [62][63][64][65][66][67][68][69] .…”

Section: Introductionmentioning

confidence: 99%

Hybrid helical state and superconducting diode effect in S/F/TI heterostructures

Karabassov¹,

Bobkova²,

Golubov³

et al. 2022

Preprint

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It is well-known that the ground state of homogeneous superconducting systems with spin-orbit coupling (SOC) in the presence of the Zeeman field is the so-called helical state, which is characterized by the phase modulation of the order parameter, but zero supercurrent density. In this work we investigate the realization of the helical state in a hybrid system with spatially separated superconductivity and exchange field by considering S/F bilayer on top of a 3D topological insulator. This system is characterized by strong spin-momentum locking and, consequently, provides the most favorable conditions for the helical state generation. The analysis is based on the microscopic theory in terms of the quasiclassical Green's functions. We demonstrate that in the bilayer the helical state survives if the exchange field has non-zero component perpendicular to the S/F interface even in spite of the fact that the superconducting order parameter and the exchange field are spatially separated. At the same time, in this spatially inhomogeneous situation the helical state is accompanied by the spontaneous currents distributed over the bilayer in such a way as to have zero average. Further, we show that this hybrid helical state gives rise to nonreciprocity in the system. We demonstrate the realization of the superconducting diode effect and show that the degree of nonreciprocity is very large in the considered system due to the strongest possible value of the spin-momentum locking.

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Intrinsic Superconducting Diode Effect

Cited by 201 publications

References 55 publications

Pair-density-wave and chiral superconductivity in twisted bilayer transition-metal-dichalcogenides

Pair-density-wave and chiral superconductivity in twisted bilayer transition-metal-dichalcogenides

A phenomenological theory of superconductor diodes

Hybrid helical state and superconducting diode effect in S/F/TI heterostructures

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