Microwave-Enhanced Critical Supercurrents in Constricted Tin Films

Wyatt, A. F. G.; Dmitriev, V. M.; Moore, W. S.; Sheard, F. W.

doi:10.1103/physrevlett.16.1166

Cited by 153 publications

(72 citation statements)

References 8 publications

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“…The most fascinating result is that this nonequilibrium population causes the coherent part of Y to decay (at given τ in ) slowly, as E T h /T, at T E T h , whereas the equilibrium supercurrent decays exponentially, as ∝ exp (−L/L T ). This non-equilibrium enhancement of the superconducting correlations recalls the well known effect of the microwaves enhancement of superconductivity, the phenomena, known as the DayemWyatt effect [12][13][14] , which is observed in microbridges, thin films and stripes [15][16][17][18][19] . Similar effect exist in the hybrid structures 20,21 , but their physics is enriched by existence of two different time scales: time of diffusion along the normal part τ D and inelastic scattering rate τ in , as was clearly demonstrated recently 22 .…”

Section: Introductionmentioning

confidence: 99%

Admittance of a long diffusive SNS junction

Tikhonov

Фейгельман

2015

Phys. Rev. B

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The dynamical properties of hybrid normal metal/superconductor structures have recently come into research focus both experimentally and theoretically. Recent experimental studies of the coherent admittance Y (ω) of SNS rings as function of the phase difference φ0 are still not fully understood. Here we concentrate on the linear response regime, calculating Y (ω) by solving Usadel equations, linearised in electric field. Although partially reproducing previously known results, we find qualitatively different behaviour in the collisionless regime of τ −1 in ω E T h and high temperature T E T h and low temperature T E T h near the minigap closing φ0 ∼ π. We find that the dissipative part ReY (ω) peaks when the minigap closes (at a phase difference of π) even at high temperatures, when the equilibrium supercurrent is fully suppressed.

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Section: Introductionmentioning

confidence: 99%

Admittance of a long diffusive SNS junction

Tikhonov

Фейгельман

2015

Phys. Rev. B

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“…An early experimental evidence proving the possibility of stimulating superconductivity via external fields is the Wyatt-Dayem effect [3,4], where microwave radiation of superconducting micro-bridges in the MHz to GHz frequency range was found to increase T c by a few percents. This effect was explained theoretically by Eliashberg [5] on the basis of the nonequilibrium shift of the quasiparticle occupation to high energies.…”

Section: Introductionmentioning

confidence: 99%

Theory of parametrically amplified electron-phonon superconductivity

et al. 2017

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Ultrafast optical manipulation of ordered phases in strongly correlated materials is a topic of significant theoretical, experimental, and technological interest. Inspired by a recent experiment on light-induced superconductivity in fullerenes [Mitrano et al., Nature 530, 2016], we develop a comprehensive theory of light-induced superconductivity in driven electron-phonon systems with lattice nonlinearities. In analogy with the operation of parametric amplifiers, we show how the interplay between the external drive and lattice nonlinearities lead to significantly enhanced effective electron-phonon couplings. We provide a detailed and unbiased study of the nonequilibrium dynamics of the driven system using the real-time Green's function technique. To this end, we develop a Floquet generalization of the Migdal-Eliashberg theory and derive a numerically tractable set of quantum Floquet-Boltzmann kinetic equations for the coupled electron-phonon system. We study the role of parametric phonon generation and electronic heating in destroying the transient superconducting state. Finally, we predict the transient formation of electronic Floquet bands in time-and angle-resolved photoemission spectroscopy experiments as a consequence of the proposed mechanism.

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“…Early experiments on these excitations were performed typically close to the critical temperature with large structures so that N S , the number of quasiparticle excitations, was high [1][2][3][4][5][6][7][8][9]. Later on, as the fabrication techniques progressed, it became possible to bring N S close to unity to reveal the parity effect of electrons on a superconducting island [10][11][12][13][14].…”

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confidence: 99%

Excitation of Single Quasiparticles in a Small Superconducting Al Island Connected to Normal-Metal Leads by Tunnel Junctions

et al. 2013

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We investigate the dynamics of individual quasiparticle excitations on a small superconducting aluminum island connected to normal metallic leads by tunnel junctions. We find the island to be free of excitations within the measurement resolution. This allows us to show that the residual heating, which typically limits experiments on superconductors, has an ultralow value of less than 0.1 aW. By injecting electrons with a periodic gate voltage, we probe electron-phonon interaction and relaxation down to a single quasiparticle excitation pair, with a measured recombination rate of 16 kHz. Our experiment yields a strong test of BCS theory in aluminum as the results are consistent with it without free parameters.

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Microwave-Enhanced Critical Supercurrents in Constricted Tin Films

Cited by 153 publications

References 8 publications

Admittance of a long diffusive SNS junction

Admittance of a long diffusive SNS junction

Theory of parametrically amplified electron-phonon superconductivity

Excitation of Single Quasiparticles in a Small Superconducting Al Island Connected to Normal-Metal Leads by Tunnel Junctions

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