Gapped optical excitations from gapless phases: imperfect nesting in unconventional density waves

Abstract

We consider the effect of imperfect nesting in quasi-one-dimensional unconventional density waves in the case, when the imperfect nesting and the gap depends on the same wavevector component. The phase diagram is very similar to that in a conventional density wave. The density of states is highly asymmetric with respect to the Fermi energy. The optical conductivity at T=0 remains unchanged for small deviations from perfect nesting. For higher imperfect nesting parameter, an optical gap opens, and considerable amount of spectral weight is transferred to higher frequencies. This makes the optical response of our system very similar to that of a conventional density wave. Qualitatively similar results are expected in d-density waves.

8 pages, 7 figures

References in corpus (9)

• CDW, Superconductivity and Anomalous Metallic Behavior in 2D Transition Metal Dichalcogenides
• Unconventional charge density wave in the organic conductor alpha-(BEDT-TTF)_2KHg(SCN)_4
• Micromagnetism in URu2Si2 and high temperature superconductors
• The magnetic field dependence of the threshold electric field in unconventional charge density waves
• Recent Advances in Unconventional Density Waves
• Imperfect nesting and transport properties in unconventional density waves
• Unconventional density wave in CeCoIn_5?
• Impurity scattering in unconventional density waves
• Collective modes in unconventional density waves