Fluctuation spectroscopy: From Rayleigh-Jeans waves to Abrikosov vortex clusters

Varlamov, A. A.; Galda, Alexey; Glatz, Andreas

doi:10.1103/revmodphys.90.015009

Cited by 62 publications

(71 citation statements)

References 214 publications

(385 reference statements)

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“…Vortices suffer positional changes due to thermal activation, which can be discussed using elastic theory of the vortex lattice 2, 85,89 .…”

Section: Appendix D: Fluctuations Vs Pinningmentioning

confidence: 99%

“…Anisotropy enhances fluctuations but there is practically no anisotropy in β − Bi 2 P d 22,23 . However, fluctuations are enhanced for large wavelengths, by taking into account nonlocal elastic interactions, and in presence of pinning induced disorder due to the mobility of dislocations and defects of the flux lattice 89,[94][95][96][97] . Vortex nucleation occurs here very close to the zero field T c for very low magnetic fields, which would suggest that fluctuations might play a role.…”

Section: Appendix D: Fluctuations Vs Pinningmentioning

confidence: 99%

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Observation of a gel of quantum vortices in a superconductor at very low magnetic fields

Llorens

Embon

Correa

et al. 2020

Phys. Rev. Research

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A gel consists of a network of particles or molecules formed for example using the sol-gel process, by which a solution transforms into a porous solid. Particles or molecules in a gel are mainly organized on a scaffold that makes up a porous system. Quantized vortices in type II superconductors mostly form spatially homogeneous ordered or amorphous solids. Here we present high-resolution imaging of the vortex lattice displaying dense vortex clusters separated by sparse or entirely vortex-free regions in β-Bi2Pd superconductor. We find that the intervortex distance diverges upon decreasing the magnetic field and that vortex lattice images follow a multifractal behavior. These properties, characteristic of gels, establish the presence of a novel vortex distribution, distinctly different from the well-studied disordered and glassy phases observed in high-temperature and conventional superconductors. The observed behavior is caused by a scaffold of one-dimensional structural defects with enhanced stress close to the defects. The vortex gel might often occur in type-II superconductors at low magnetic fields. Such vortex distributions should allow to considerably simplify control over vortex positions and manipulation of quantum vortex states. arXiv:1904.10999v2 [cond-mat.supr-con]

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“…Vortices suffer positional changes due to thermal activation, which can be discussed using elastic theory of the vortex lattice 2, 85,89 .…”

Section: Appendix D: Fluctuations Vs Pinningmentioning

confidence: 99%

Section: Appendix D: Fluctuations Vs Pinningmentioning

confidence: 99%

Observation of a gel of quantum vortices in a superconductor at very low magnetic fields

Llorens

Embon

Correa

et al. 2020

Phys. Rev. Research

View full text Add to dashboard Cite

show abstract

“…Fluctuating Cooper pairs in conventional superconductors alter the thermodynamics of the normal state only in the critical region ∆T Gi . The conductivity and the magnetic susceptibility [43] are however not only singular at the critical temperature, but have long high temperature tails [45]. The high temperature tail for the diamag-netic susceptibility χ ∼ χ L / ln 2 [T /T 0 ], where χ L is the Landau diamagnetic susceptibility in the normal state, was predicted [63][64][65] theoretically and observed in experiments [45].…”

Section: Discussionmentioning

confidence: 99%

“…The expres-sion for Π(ω, q) in Eq. (7) is well known [43,44] from previous work on systems without layer degrees of freedom. The chiral nature of the bilayer graphene charge carriers is captured by the nontrivial matrix form-factorM l in the Bethe-Salpheter Eq.…”

Section: A the Cooper Instabilitymentioning

confidence: 99%

“…This critical behavior has been predicted by one of the authors [40] and has been interpreted as a fluctuational internal Josephson effect. It originates from partly coherent fluctuating electron-hole Cooper pairs [40][41][42] that are a precursor of equilibrium pairing and reminiscent of Aslamazov-Larkin and related effects in superconductors [43][44][45]. Above T 0 fluctuating Cooper pairs have a finite coherence time [19,[46][47][48] and cannot support a dissipationless tunneling current.…”

Section: Introductionmentioning

confidence: 99%

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Tunneling and fluctuating electron-hole Cooper pairs in double bilayer graphene

et al. 2020

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A strong low-temperature enhancement of the tunneling conductance between graphene bilayers has been reported recently, and interpreted as a signature of equilibrium electron-hole pairing, first predicted in bilayers more than forty years ago but previously unobserved. Here we provide a detailed theory of conductance enhanced by fluctuating electron-hole Cooper pairs, which are a precursor to equilibrium pairing, that accounts for specific details of the multi-band double graphene bilayer system which supports several different pairing channels. Above the equilibrium condensation temperature, pairs have finite temporal coherence and do not support dissipationless tunneling. Instead they strongly boost the tunneling conductivity via a fluctuational internal Josephson effect. Our theory makes predictions for the dependence of the zero bias peak in the differential tunneling conductance on temperature and electron-hole density imbalance that capture important aspects of the experimental observations. In our interpretation of the observations, cleaner samples with longer disorder scattering times would condense at temperatures Tc up to ∼ 50K, compared to the record Tc ∼ 1.5K achieved to date in experiment. :1903.07739v2 [cond-mat.mes-hall] arXiv

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Dark photon vortex formation and dynamics

East

Huang

2022

J. High Energ. Phys.

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We study the formation and evolution of vortices in U(1) dark photon dark matter and dark photon clouds that arise through black hole superradiance. We show how the production of both longitudinal mode and transverse mode dark photon dark matter can lead to the formation of vortices. After vortex formation, the energy stored in the dark photon dark matter will be transformed into a large number of vortex strings, eradicating the coherent dark photon dark matter field. In the case where a dark photon magnetic field is produced, bundles of vortex strings are formed in a superheated phase transition, and evolve towards a configuration consisting of many string loops that are uncorrelated on large scales, analogous to a melting phase transition in condensed matter. In the process, they dissipate via dark photon and gravitational wave emission, offering a target for experimental searches. Vortex strings were also recently shown to form in dark photon superradiance clouds around black holes, and we discuss the dynamics and observational consequences of this phenomenon with phenomenologically motivated parameters. In that case, the string loops ejected from the superradiance cloud, apart from producing gravitational waves, are also quantised magnetic flux lines and can be looked for with magnetometers. We discuss the connection between the dynamics in these scenarios and similar vortex dynamics found in type II superconductors.

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Fluctuation spectroscopy: From Rayleigh-Jeans waves to Abrikosov vortex clusters

Cited by 62 publications

References 214 publications

Observation of a gel of quantum vortices in a superconductor at very low magnetic fields

Observation of a gel of quantum vortices in a superconductor at very low magnetic fields

Tunneling and fluctuating electron-hole Cooper pairs in double bilayer graphene

Dark photon vortex formation and dynamics

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