Optical conductivity near finite-wavelength quantum criticality (Articolo in rivista)

Type
Label
  • Optical conductivity near finite-wavelength quantum criticality (Articolo in rivista) (literal)
Anno
  • 2007-01-01T00:00:00+01:00 (literal)
Alternative label
  • Caprara, S; Grilli, M; Di Castro, C; Enss, T (2007)
    Optical conductivity near finite-wavelength quantum criticality
    (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
  • Caprara, S; Grilli, M; Di Castro, C; Enss, T (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#numeroVolume
  • 75 (literal)
Note
  • ISI Web of Science (WOS) (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#affiliazioni
  • Univ Roma La Sapienza, SMC, INFM, CNR, I-00185 Rome, Italy; Univ Roma La Sapienza, Dipartimento Fis, I-00185 Rome, Italy (literal)
Titolo
  • Optical conductivity near finite-wavelength quantum criticality (literal)
Abstract
  • We study the optical conductivity sigma(Omega) of an electron system near a quantum-critical point with finite-wavelength ordering. sigma(Omega) vanishes in clean Galilean-invariant systems, unless electrons are coupled to dynamical collective modes, which dissipate the current. This coupling introduces a nonuniversal energy scale. Depending on the parameters of each specific system, a variety of responses arise near criticality: scaling peaks at a temperature- and doping-dependent frequency, peaks at a fixed frequency, or no peaks to be associated with criticality. Therefore the lack of scaling in the far-infrared conductivity in cuprates does not necessarily call for new concepts of quantum criticality. (literal)
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