Optical conductivity near finite-wavelength quantum criticality
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 introd...
Gespeichert in:
| Hauptverfasser: | , |
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| Dokumenttyp: | Article (Journal) Kapitel/Artikel |
| Sprache: | Englisch |
| Veröffentlicht: |
2007
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| In: |
Arxiv
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| Online-Zugang: | Verlag, kostenfrei, Volltext: http://arxiv.org/abs/cond-mat/0610676
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| Verfasserangaben: | S. Caprara, M. Grilli, C. Di Castro, and T. Enss |
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| 100 | 1 | |a Caprara, Sergio |e VerfasserIn |4 aut | |
| 245 | 1 | 0 | |a Optical conductivity near finite-wavelength quantum criticality |c S. Caprara, M. Grilli, C. Di Castro, and T. Enss |
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| 520 | |a 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. | ||
| 650 | 4 | |a Condensed Matter - Strongly Correlated Electrons | |
| 650 | 4 | |a Condensed Matter - Superconductivity | |
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