Resolving different pairing states in Weyl superconductors through the single-particle spectrum

Zhou, Tao; Wang, Z. D.

doi:10.1103/physrevb.98.024515

Cited by 6 publications

(5 citation statements)

References 64 publications

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“…The conventional BCS superconductivity in Weyl semimetals can occur due to the inter-valley couplings while the unconventional triplet correlations may arise by the intravalley pairings [14][15][16][17][18][19][20][21][22][23][24][25][26][27][28][29] . The latter case, if energetically favorable, might create superconducting correlations with finite momentum that places these correlations in the Fulde-Ferrell-Larkin-Ovchinnikov (FFLO) phase 14,18 .…”

Section: Introductionmentioning

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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Section: Introductionmentioning

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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“…This may lead to unconventional superconducting states, such as a mixed singlet and triplet superconductivity [35][36][37] , or a Fulde-Ferrell-Larkin-Ovchinnikov (FFLO) finite momentum pairing [38][39][40][41][42][43] . It can also enable the realization of a Weyl semimetal phase, which, coupled to superconductivity, constitutes an ideal platform to study unconventional superconducting states or topological superconductivity [44][45][46][47][48][49][50][51] .…”

Section: Introductionmentioning

confidence: 99%

Bereziskii-Kosterlitz-Thouless transition in the Weyl system PtBi2

Veyrat

Labracherie²,

Acharya³

et al. 2021

Preprint

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Symmetry breaking in topological matter became, in the last decade, a key concept in condensed matter physics to unveil novel electronic states. In this work, we reveal that broken inversion symmetry and strong spin-orbit coupling in trigonal PtBi2 lead to a Weyl semimetal band structure, with unusually robust two-dimensional superconductivity in thin fims. Transport measurements show that high-quality PtBi2 crystals are three-dimensional superconductors (Tc≈600 mK) with an isotropic critical field (Bc≈50 mT). Remarkably, we evidence in a rather thick flake (60 nm), exfoliated from a macroscopic crystal, the two-dimensional nature of the superconducting state, with a critical temperature Tc≈370 mK and highly-anisotropic critical fields. Our results reveal a Berezinskii-Kosterlitz-Thouless transition with TBKT≈310 mK and with a broadening of Tc due to inhomogenities in the sample. Due to the very long superconducting coherence length ξ in PtBi2, the vortex-antivortex pairing mechanism can be studied in unusually-thick samples (at least five times thicker than for any other two-dimensional superconductor), making PtBi2 an ideal platform to study low dimensional superconductivity in a topological semimetal.

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“…Let us start by reviewing the existing literature on the combination of superconductivity with WSM. First class of works start by a Weyl system which is superconductor in the bulk and examine the resulting surface states 17,25,26 . In this class of works, doping a WSM converts the flat band along the nodal direction to crossing flat bands 27 .…”

Section: Introductionmentioning

confidence: 99%

Induced superconductivity in Fermi arcs

Faraei

Jafari

2019

Phys. Rev. B

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When the interface of a superconductor (SC) with Weyl semimetal (WSM) supports Fermi arcs, the chirality blockade eliminates the induction of superconductivity into the bulk. This leaves the Fermi arc states as the only low-energy degrees of freedom in the proximity problem. Therefore the SC|WSM system will be a platform to probe transport properties that only involve the Fermi arcs. With a boundary condition that flips the spin at the boundary, we find a Z2 protected Bogoliubov Fermi contour (BFC) around which the Bogoliubov quasi-particles disperse linearly. The resulting BFC and excitations around it leave a distinct T 2 temperature dependence in their contribution to specific heat. Furthermore, the topologically protected BFC being a Majorana Fermi surface gives rise to a zero-bias peak the strength of which characteristically depends on the length of Fermi arc and tunneling strength. For the other BC that flips the chirality at the interface, instead of BFCs we have Bogoliubov-Weyl nodes whose location depends on the tunneling strength. arXiv:1901.11209v1 [cond-mat.supr-con]

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Resolving different pairing states in Weyl superconductors through the single-particle spectrum

Cited by 6 publications

References 64 publications

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

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

Bereziskii-Kosterlitz-Thouless transition in the Weyl system PtBi2

Induced superconductivity in Fermi arcs

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