http://www.cnr.it/ontology/cnr/individuo/prodotto/ID2529
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
- 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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