Optical conductivity near finite-wavelength quantum criticality
We study the optical conductivity σ(Ω) of an electron system near a quantum-critical point with finite-wavelength ordering. σ(Ω) vanishes in clean Galilean-invariant systems, unless electrons are coupled to dynamical collective modes, which dissipate the current. This coupling introduces a nonuniver...
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| Main Authors: | , |
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| Format: | Article (Journal) |
| Language: | English |
| Published: |
13 April 2007
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| In: |
Physical review. B, Condensed matter and materials physics
Year: 2007, Volume: 75, Issue: 14 |
| ISSN: | 1550-235X |
| DOI: | 10.1103/PhysRevB.75.140505 |
| Online Access: | Verlag, Volltext: http://dx.doi.org/10.1103/PhysRevB.75.140505 Verlag, Volltext: https://link.aps.org/doi/10.1103/PhysRevB.75.140505 
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| Author Notes: | S. Caprara, M. Grilli, C. Di Castro, and T. Enss |
| Summary: | We study the optical conductivity σ(Ω) of an electron system near a quantum-critical point with finite-wavelength ordering. σ(Ω) 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. |
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| Item Description: | Gesehen am 23.11.2017 |
| Physical Description: | Online Resource |
| ISSN: | 1550-235X |
| DOI: | 10.1103/PhysRevB.75.140505 |