Nature and Raman signatures of the Higgs amplitude mode in the coexisting superconducting and charge-density-wave state (Articolo in rivista)

Type
Label
  • Nature and Raman signatures of the Higgs amplitude mode in the coexisting superconducting and charge-density-wave state (Articolo in rivista) (literal)
Anno
  • 2014-01-01T00:00:00+01:00 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#doi
  • 10.1103/PhysRevB.90.224515 (literal)
Alternative label
  • T. Cea and L. Benfatto (1) (2014)
    Nature and Raman signatures of the Higgs amplitude mode in the coexisting superconducting and charge-density-wave state
    in Physical review. B, Condensed matter and materials physics
    (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
  • T. Cea and L. Benfatto (1) (literal)
Pagina inizio
  • 224515-1 (literal)
Pagina fine
  • 224515-10 (literal)
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  • Published 18 December 2014. (literal)
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  • http://journals.aps.org/prb/abstract/10.1103/PhysRevB.90.224515 (literal)
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  • 90 (literal)
Rivista
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  • 10 (literal)
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  • 22 (literal)
Note
  • ISI Web of Science (WOS) (literal)
  • Scopu (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#affiliazioni
  • (1) ISC-CNR and Dep. of Physics, \"Sapienza\" University of Rome, P.le A. Moro 5, 00185, Rome, Italy (literal)
Titolo
  • Nature and Raman signatures of the Higgs amplitude mode in the coexisting superconducting and charge-density-wave state (literal)
Abstract
  • We investigate the behavior of the Higgs (amplitude) mode when superconductivity emerges on a preexisting charge-density-wave state. We show that the weak overdamped square-root singularity of the amplitude fluctuations in a standard BCS superconductor is converted in a sharp, undamped power-law divergence in the coexisting state, reminiscent of the Higgs behavior in Lorentz-invariant theories. This effect reflects in a strong superconducting resonance in the Raman spectra, both for an electronic and a phononic mechanism leading to the Raman visibility of the Higgs. In the latter case, our results are relevant to the interpretation of the Raman spectra measured experimentally in NbSe2. (literal)
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