Magnetic Proximity-Induced Superconducting Diode Effect and Infinite Magnetoresistance in van der Waals Heterostructure

Shin, Jung-Hoo; Son, Sangyoung; Yun, Jonginn; Park, Giung; Zhang, Kaixuan; Shin, Young Jae; Park, Je‐Geun; Kim, Dohun

doi:10.48550/arxiv.2111.05627

Cited by 16 publications

(17 citation statements)

References 6 publications

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“…In both cases, the SOI was of Rashbatype and the supercurrent rectification driven by the in-plane field perpendicular to the current. Very recent reports [25,26] have demonstrated the supercurrent diode effect in a system (few-layer NbSe 2 ) with valley-Zeeman SOI, where the rectification is driven by the out-of-plane field, as expected from theory [27]. As discussed in our previous work [23], in JJs with Rashba SOI, the supercurrent diode effect is strictly related to the ϕ 0 shift discussed above.…”

supporting

confidence: 62%

Effect of Rashba and Dresselhaus spin-orbit coupling on supercurrent rectification and magnetochiral anisotropy of ballistic Josephson junctions

Baumgartner,

Fuchs,

Costa

et al. 2021

Preprint

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supporting

confidence: 62%

Effect of Rashba and Dresselhaus spin-orbit coupling on supercurrent rectification and magnetochiral anisotropy of ballistic Josephson junctions

Baumgartner,

Fuchs,

Costa

et al. 2021

Preprint

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“…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] . Here we investigate it in the topological insulator based systems and obtain that the value of the nonreciprocity defined as (I c+ − I c− )/(I c+ + I c− ) is of the order of unity, thus demonstrating that the 3D TI -based systems are very perspective for studying magnetoelectric effects and nonreciprocity.…”

Section: Introductionmentioning

confidence: 85%

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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“…-Recently, there has been a surge of interest in nonreciprocal phenomena in superconductors. In particular, recent experiments have observed an asymmetry between forward and reverse critical currents I c+ = I c− in superconducting films [1][2][3] and Josephson junctions [4][5][6][7][8]. In the presence of such a nonreciprocity, currents of magnitudes in the range between I c+ and I c− can flow without resistance in only one direction, resulting in supercurrent diode effect.…”

mentioning

confidence: 99%

Universal Josephson diode effect

Davydova¹,

Prembabu²,

Fu³

2022

Preprint

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We propose a universal mechanism for the Josephson diode effect in short Josephson junctions. The proposed mechanism is due to finite Cooper pair momentum and is a manifestation of simultaneous breaking of inversion and time-reversal symmetries. The diode efficiency is up to 40 %, which corresponds to an asymmetry between the critical currents in opposite directions Ic+/Ic− ≈ 230 %. We show that this arises from both the Doppler shift of the Andreev bound state energies and the phase-independent asymmetric current from the continuum. Finally, we propose a simple scheme for achieving finite-momentum pairing, which does not rely on spin-orbit coupling and thus greatly expands existing platforms for the observation of supercurrent diode effects.

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Magnetic Proximity-Induced Superconducting Diode Effect and Infinite Magnetoresistance in van der Waals Heterostructure

Cited by 16 publications

References 6 publications

Effect of Rashba and Dresselhaus spin-orbit coupling on supercurrent rectification and magnetochiral anisotropy of ballistic Josephson junctions

Effect of Rashba and Dresselhaus spin-orbit coupling on supercurrent rectification and magnetochiral anisotropy of ballistic Josephson junctions

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

Universal Josephson diode effect

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