Dynamical Spin Polarization of Excess Quasiparticles in Superconductors.

@article{Meyer2019DynamicalSP,
  title={Dynamical Spin Polarization of Excess Quasiparticles in Superconductors.},
  author={Julia S. Meyer and Manuel Houzet and Yuli V. Nazarov},
  journal={Physical review letters},
  year={2019},
  volume={125 9},
  pages={
          097006
        }
}
We show that the annihilation dynamics of excess quasiparticles in superconductors may result in the spontaneous formation of large spin-polarized clusters. This presents a novel scenario for spontaneous spin polarization. We estimate the relevant scales for aluminum, finding the feasibility of clusters with total spin S≃10^{4}ℏ that could be spread over microns. The fluctuation dynamics of such large spins may be detected by measuring the flux noise in a loop hosting a cluster. 

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References

SHOWING 1-10 OF 44 REFERENCES

Quasiparticle and phonon lifetimes in superconductors

Low-energy quasiparticle scattering, recombination, and branch-mixing lifetimes and phonon pair-breaking and scattering lifetimes are calculated for superconductors. The quasiparticle calculations

Trapping of quasiparticles of a nonequilibrium superconductor

We have performed experiments where hot electrons are extracted from a normal metal into a superconductor through a tunnel junction. We have measured the cooling performance of such NIS junctions,

Ferromagnetic ordering of quasiparticles in nonequilibrium superconductors and the rise of domains

It is shown that in nonequilibrium superconductors new states with spontaneous spin polarization of quasiparticles can exist due to the Fermi-liquid exchange interaction. The stability of both

Electron-phonon interaction in an impure metal

On the basis of the existing theory of ultrasonic attenuation, a model Hamiltonian is derived which has to replace the Fröhlich Hamiltonian, at least in an impure metal. Whilst the imaginary part of

Spin relaxation in semiconductor quantum dots

Quantum dots ~QD’s ! are small conductive regions in semiconductor structures that contain a tunable number of carriers. The shape and size of quantum dots can be controlled by the gate voltage. The

Photon-Assisted Charge-Parity Jumps in a Superconducting Qubit.

Among the signatures of the new mechanism is the same order of rates of the transitions in which a qubit loses or gains energy, which is in agreement with recent experiments, and offers the possibility to characterize the electromagnetic environment of superconducting devices at the single-photon level for frequencies above thesuperconducting gap.

Inhomogeneous state of superconductors by intense tunnel injection of quasiparticles

Measurements of the current-voltage characteristics of a tunnel junction as a function of quasiparticle injection from a second tunnel junction are presented. Aluminum films (300 » thick) are studied

Magnetic-field-induced stabilization of nonequilibrium superconductivity in a normal-metal/insulator/superconductor junction

Powered by TCPDF (www.tcpdf.org) This material is protected by copyright and other intellectual property rights, and duplication or sale of all or part of any of the repository collections is not

Loss Mechanisms and Quasiparticle Dynamics in Superconducting Microwave Resonators Made of Thin-Film Granular Aluminum.

The current level of coherence of grAl resonators makes them attractive for integration in quantum devices, while it also evidences the need to reduce the density of nonequilibrium QPs.