Publikation:

Finite Frequency Noise of a Superconductor-Ferromagnet Quantum Point Contact

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2008

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Cottet, Audrey
Doucot, Benoit

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http://nbn-resolving.de/urn:nbn:de:bsz:352-opus-120701
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https://doi.org/10.1103/PhysRevLett.101.257001
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Physical Review Letters. 2008, 101, 257001. Available under: doi: 10.1103/PhysRevLett.101.257001

Zusammenfassung

We calculate the finite-frequency current noise of a superconductor-ferromagnet quantum point contact (SF QPC). This signal is qualitatively affected by the spin dependence of interfacial phase shifts acquired by electrons upon reflection on the QPC. For a weakly transparent QPC, noise steps appear at frequencies or voltages determined directly by the spin dependence of interfacial phase shifts. These steps can occur at experimentally accessible temperatures and frequencies. Finite-frequency noise is thus a promising tool to characterize the scattering properties of a SF QPC.

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530 Physik

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shot-nlise, mesoscopic conductors

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ISO 690COTTET, Audrey, Benoit DOUCOT, Wolfgang BELZIG, 2008. Finite Frequency Noise of a Superconductor-Ferromagnet Quantum Point Contact. In: Physical Review Letters. 2008, 101, 257001. Available under: doi: 10.1103/PhysRevLett.101.257001
BibTex
@article{Cottet2008Finit-992,
  year={2008},
  doi={10.1103/PhysRevLett.101.257001},
  title={Finite Frequency  Noise of a Superconductor-Ferromagnet Quantum  Point Contact},
  volume={101},
  journal={Physical Review Letters},
  author={Cottet, Audrey and Doucot, Benoit and Belzig, Wolfgang},
  note={Article Number: 257001}
}
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    <dcterms:abstract xml:lang="eng">We calculate the finite-frequency current noise of a superconductor-ferromagnet quantum point contact (SF QPC). This signal is qualitatively affected by the spin dependence of interfacial phase shifts acquired by electrons upon reflection on the QPC. For a weakly transparent QPC, noise steps appear at frequencies or voltages determined directly by the spin dependence of interfacial phase shifts. These steps can occur at experimentally accessible temperatures and frequencies. Finite-frequency noise is thus a promising tool to characterize the scattering properties of a SF QPC.</dcterms:abstract>
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