Spin-Orbit induced phase-shift in Bi2Se3 Josephson junctions

Assouline, Alexandre; Feuillet-Palma, C.; Bergeal, N.; Zhang, Tianzhen; Mottaghizadeh, Alireza; Zimmers, A.; Lhuillier, Emmanuel; Eddrie, Mahmoud; Atkinson, P.; Aprili, M.; Aubin, H.

doi:10.1038/s41467-018-08022-y

Cited by 135 publications

(121 citation statements)

References 43 publications

(56 reference statements)

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“…Hence, the predicted robust self-biased current should be experimentally accessible over a wide range of parameters. 8,9,[76][77][78][79] It is worth men- tioning that in a recent experiment, 79 this self-biased current was observed using a Bi 2 Se 3 platform, which is in agreement with theoretical predictions for topological insulator Josephson junctions [76][77][78] .…”

Section: B Charge Supercurrentsupporting

confidence: 83%

Evolution of pair correlation symmetries and supercurrent reversal in tilted Weyl semimetals

Alidoust

Halterman

2020

Phys. Rev. B

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We study the effective symmetry profiles of superconducting pair correlations and the flow of charge supercurrent in ballistic Weyl semimetal systems with a tilted dispersion relation. Utilizing a microscopic method in the ballistic regime and starting from both opposite-pseudospin and equal-pseudospin phonon-mediated oppositespin electron-electron couplings, we calculate the anomalous Green's function to study various superconducting pair correlations that Weyl semimetal systems may develop. The momentum-space profile reveals that by properly manipulating the parameters of Weyl semimetal systems, including the tilting parameter, the effective symmetry class of even-parity s-wave (odd-parity p-wave) superconducting correlations can be converted into a d-wave ( f -wave) symmetry class that consists of equal-pseudospin and opposite-pseudospin channels. We also find that the supercurrent in a ballistic Weyl Josephson junction can be made to vanish or switch directions, depending on the tilt of the Weyl cones, in addition to the relevant parameters characterizing the Weyl semimetal and junction. We show that inversion symmetry breaking terms introduce transitions that result in the appearance of self-biased current at zero difference between the macroscopic phases of the superconducting segments, creating a ϕ 0 Josephson state. Weyl semimetal systems are shown to offer several experimentally tunable parameters to control the induction of higher harmonics into the current phase relations. arXiv:1906.05382v1 [cond-mat.supr-con]

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Section: B Charge Supercurrentsupporting

confidence: 83%

Evolution of pair correlation symmetries and supercurrent reversal in tilted Weyl semimetals

Alidoust

Halterman

2020

Phys. Rev. B

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“…Its ground state corresponds to a finite phase shift in its currentphase-relation 0 < ϕ 0 < π. Such anomalous phase has been recently detected experimentally in hybrid Josephson junctions fabricated with the topological insulator Bi 2 Se 3 [17] and Al/InAs heterostructures [18]. Both materials have strong spin-orbit coupling and in those experiments, time reversal is broken by an external magnetic field that acts as a Zeeman field.…”

Section: Introductionmentioning

confidence: 85%

Cryogenic Memory Element Based on an Anomalous Josephson Junction

Guarcello

Bergeret

2020

Phys. Rev. Applied

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We propose a non-volatile memory element based on a lateral ferromagnetic Josephson junction with spinorbit coupling and out-of-plane magnetization. The interplay between the latter and the intrinsic exchange field of the ferromagnet leads to a magnetoelectric effect that couples the charge current through the junction and its magnetization, such that by applying a current pulse the direction of the magnetic moment in F can be switched. The two memory states are encoded in the direction of the out-of-plane magnetization. With the aim to determine the optimal working temperature for the memory element, we explore the noise-induced effects on the averaged stationary magnetization by taking into account thermal fluctuations affecting both the Josephson phase and the magnetic moment dynamics. We investigate the switching process as a function of intrinsic parameters of the ferromagnet, such as the Gilbert damping and strength of the spin-orbit coupling, and proposed a non-destructive readout scheme based on a dc-SQUID. Additionally, we analyze a way to protect the memory state from external perturbations by voltage gating in systems with a both linear-in-momentum Rashba and Dresselhaus spin-orbit coupling.

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“…Hence, this phenomenon can obviously occur in moderately disordered and ballistic regimes as quite recently explored in experiment 67 inline with theory predictions for topolog- ical insulator surface channels [63][64][65] and black phosphorus monolayer 26,27 . Also, the explored ϕ 0 state in this paper relies on the inherent parameters of Weyl semimetal without involving Zeeman field 26,27,[63][64][65][66][67] . It is worth mentioning that the appearance of 4π-periodic current phase relation in topological insulator Josephson junctions might be due to the presence of Majorana Fermions although such a 4π-periodic supercurrent phase relation can be theoretically obtained in the trivial regime of a ballistic topological insulator 65,78 .…”

Section: Self-biased Supercurrent and Supercurrent Reversalsmentioning

confidence: 99%

Self-biased current, magnetic interference response, and superconducting vortices in tilted Weyl semimetals with disorder

Alidoust

2018

Phys. Rev. B

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We have generalized a quasiclassical model for Weyl semimetals with a tilted band in the presence of an externally applied magnetic field. This model is applicable to ballistic, moderately disordered, and samples containing a high density of nonmagnetic impurities. We employ this formalism and show that a self-biased supercurrent, creating a ϕ 0 -junction, can flow through a triplet channel in Weyl semimetals. Furthermore, our results demonstrate that multiple supercurrent reversals are accessible through varying junction thickness and parameters characterizing Weyl semimetals. We discuss the influence of different parameters on the Fraunhofer response of charge supercurrent, and how these parameters are capable of shifting the locations of proximityinduced vortices in the triplet channel. arXiv:1811.11765v2 [cond-mat.mes-hall]

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Spin-Orbit induced phase-shift in Bi2Se3 Josephson junctions

Cited by 135 publications

References 43 publications

Evolution of pair correlation symmetries and supercurrent reversal in tilted Weyl semimetals

Evolution of pair correlation symmetries and supercurrent reversal in tilted Weyl semimetals

Cryogenic Memory Element Based on an Anomalous Josephson Junction

Self-biased current, magnetic interference response, and superconducting vortices in tilted Weyl semimetals with disorder

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