Evaluating Superconductors through Current Induced Depairing

Kunchur, Milind N.

doi:10.3390/condmat4020054

Cited by 5 publications

(3 citation statements)

References 42 publications

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“…A technical description of this experimental approach and further details on the depairing current can be found elsewhere (see e.g. [52][53][54][55].…”

Section: Discussionmentioning

confidence: 99%

Multiple-q current states in a multicomponent superconducting channel

Yerin¹,

Drechsler²,

Cuoco³

et al. 2023

Preprint

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It is well-established that multicomponent superconductors can host different nonstandard phenomena such as broken-time reversal symmetry (BTRS) states, exotic Fulde-Ferrell-Larkin-Ovchinnikov (FFLO) phases, the fractional Josephson effect as well as plenty of topological defects like phase solitons, domain walls and unusual vortex structures. We show that in the case of a two-component superconducting quasi-one-dimensional channel this catalogue can be extended by a novel inhomogeneous current state, which we have termed as a multiple-momenta state or, in short, a multiple-q state, characterized by the coexistence of two different interpenetrating Cooper pair condensates with different total momenta. Within the Ginzburg-Landau formalism for a dirty twoband superconductor with sizable impurity scattering treated in the Born-approximation we reveal that under certain conditions, the occurrence of multiple-q states can induce a cascade of transitions involving switching between them and the homogeneous BTRS (non-BTRS) states and vice versa leading this way to a complex interplay of homogeneous and inhomogeneous current states. We find that hallmarks of such a multiple-q state within a thin wire or channel can be a saw-like dependence of the depairing current and the existence of two distinct stable branches on it (a bistable current state).

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“…A technical description of this experimental approach and further details on the depairing current can be found elsewhere (see e.g. [52][53][54][55].…”

Section: Discussionmentioning

confidence: 99%

Multiple-q current states in a multicomponent superconducting channel

Yerin¹,

Drechsler²,

Cuoco³

et al. 2023

Preprint

View full text Add to dashboard Cite

show abstract

“…A technical description of such an experimental approach and further details concerning the depairing current can be found elsewhere (see e.g. [49][50][51][52]). Within this approach the control of the superconducting momentum during experiments can be achieved in the so-called voltage-driven regime, i.e.…”

Section: Discussionmentioning

confidence: 99%

Multiple-q current states in a multicomponent superconducting channel

Yerin,

Drechsler,

Cuoco

et al. 2023

J. Phys.: Condens. Matter

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It is well-established that multicomponent superconductors can host different nonstandard phenomena such as broken-time reversal symmetry (BTRS) states, exotic Fulde-Ferrell-Larkin-Ovchinnikov (FFLO) phases, the fractional Josephson effect as well as plenty of topological defects like phase solitons, domain walls and unusual vortex structures. We show that in the case of a two-component superconducting quasi-one-dimensional channel this catalogue can be extended by a novel inhomogeneous current state, which we have termed as a multiple-momenta state or, in short, a multiple-q state, characterized by the coexistence of two different interpenetrating Cooper pair condensates with different total momenta. Within the Ginzburg-Landau formalism for a dirty two-band superconductor with sizable impurity scattering treated in the Born-approximation we reveal that under certain conditions, the occurrence of multiple-q states can induce a cascade of transitions involving switching between them and the homogeneous BTRS (non-BTRS) states and vice versa leading this way to a complex interplay of homogeneous and inhomogeneous current states. We find that hallmarks of such a multiple-q state within a thin wire or channel can be a saw-like dependence of the depairing current and the existence of two distinct stable branches on it (a bistable current state).

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“…In the related context of superconductivity, the maximum current J c is an intrinsic property of a superconductor and corresponds to the depairing current, whose knowledge is crucial in applications of thin and narrow superconducting films, like nanowire single-photon detectors and microwave kinetic inductance detectors [36][37][38]. Remaining in this related context, it may be instructive to relate the Landau threshold for viscous flow to the onset of gapless superconductivity.…”

Section: A Intrinsic Critical Current Of a Weakly Attractive Fermi Gasmentioning

confidence: 99%

Critical current throughout the BCS-BEC crossover with the inclusion of pairing fluctuations

Pisani,

Piselli,

Strinati

2024

Phys. Rev. A

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The present work aims at providing a systematic analysis of the current density versus momentum characteristics for a fermionic superfluid throughout the BCS-BEC crossover, even in the fully homogeneous case. At low temperatures, where pairing fluctuations are not strong enough to invalidate a quasiparticle approach, a sharp threshold for the inception of a back-flow current is found, which sets the onset of dissipation and identifies the critical momentum according to Landau. This momentum is seen to smoothly evolve from the BCS to the BEC regimes, whereby a single expression for the single-particle current density that includes pairing fluctuations enables us to incorporate on equal footing two quite distinct dissipative mechanisms, namely, pair breaking and phonon excitations in the two sides of the BCS-BEC crossover, respectively. At finite temperature, where thermal fluctuations broaden the excitation spectrum and make the dissipative (kinetic and thermal) mechanisms intertwined with each other, an alternative criterion due to Bardeen is instead employed to signal the loss of superfluid behavior. In this way, detailed comparison with available experimental data in linear and annular geometries is significantly improved with respect to previous approaches, thereby demonstrating the crucial role played by quantum fluctuations in renormalizing the single-particle excitation spectrum.

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Evaluating Superconductors through Current Induced Depairing

Cited by 5 publications

References 42 publications

Multiple-q current states in a multicomponent superconducting channel

Multiple-q current states in a multicomponent superconducting channel

Multiple-q current states in a multicomponent superconducting channel

Critical current throughout the BCS-BEC crossover with the inclusion of pairing fluctuations

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