Optical conductivity of unconventional charge density wave systems: Role of vertex corrections

Details Optical conductivity of unconventional charge density wave systems: Role of vertex corrections Optical conductivity of unconventional charge density wave systems: Role of vertex corrections

2005-04-25

arxiv.org/abs/cond-mat/0504633v1

Phys. Rev. B 72, 115118 (2005)

Physics

Condensed Matter

Strongly Correlated Electrons

10 pages, 6 figures

Scientific paper

10.1103/PhysRevB.72.115118

The optical conductivity of a d-CDW conductor is calculated for electrons on a square lattice and a nearest-neighbor charge-charge interaction using the lowest-order conserving approximation. The spectral properties of the Drude-like peak at low frequencies and the broad hump due to transitions across the gap at large frequencies are discussed, also as a function of temperature and of the second-nearest neighbor hopping term t'. We find that vertex corrections enhance the d.c. conductivity, make the Drude peak narrower and provide a smooth transition from a renormalized regime at low to the bare theory at high frequencies. It is also shown that vertex corrections enhance the temperature dependence of the restricted optical sum leading to a non-negligible violation of the sum rule in the d-CDW state.

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