Optical conductivity near finite-wavelength quantum criticality

Details Optical conductivity near finite-wavelength quantum criticality Optical conductivity near finite-wavelength quantum criticality

2006-10-24

arxiv.org/abs/cond-mat/0610676v2

Phys. Rev. B 75, 140505(R) (2007)

Physics

Condensed Matter

Superconductivity

4 pages, 4 figures; version as published

Scientific paper

10.1103/PhysRevB.75.140505

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.

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