In-plane optical features of the underdoped La_2CuO_4 based compounds: theoretical multiband analysis
arXiv:cond-mat/0201387 · doi:10.1016/S0921-4534(03)00939-0
Abstract
The three-component ab-plane optical conductivity of the high-T_c cuprates is derived using the gauge invariant response theory, and compared to the data previously obtained from the optical reflectivity measurements in the La_2CuO_4 based families. The valence electrons are described by the Emery three-band model with the antiferromagnetic correlations represented by an effective single-particle potential. In the 0 < delta < 0.3 doping range, it is shown that the total spectral weight of the three-band model is shared between the intra- and interband channels nearly in equal proportions. At optimum doping, the low-frequency conductivity has a (non-Drude) nearly single-component form, which transforms with decreasing doping into a two-component structure. The mid-infrared spectral weight is found to be extremely sensitive to the symmetry of the effective single-particle potential, as well as to the doping level. The gauge invariant form of the static and elastic Raman vertices is determined, allowing explicit verification of the effective mass theorem and the related conductivity sum rules.
12 pages, 5 figures; Physica C 391 (2003) 251
References in corpus (7)
- Evidence for ubiquitous strong electron-phonon coupling in high-temperature superconductors
- On the Doping and Temperature Dependence of the Mass Enhancement Observed in the Cuprate Bi2212
- Sum rules and electrodynamics of high-Tc cuprates in the pseudogap state
- Raman Scattering versus Infrared Conductivity: Evidence for one-dimensional Conduction in La_{2-x}Sr_{x}CuO_{4}
- On the nature of antiferromagnetism in the CO_2 planes of oxide superconductors
- Sum rule for the optical scattering rates
- The influence of the weak bond-energy dimerization on the single-particle optical conductivity of quasi-one-dimensional systems