Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2002-03-13
Physica B 322 (2002) 154-162
Physics
Condensed Matter
Strongly Correlated Electrons
7 pages, 5 figures, to appear in Physica B
Scientific paper
The single-particle contributions to the optical conductivity of the quasi-one-dimensional systems has been reexamined by using the gauge-invariant transverse microscopic approach. The valence electrons are described by a model with the weak bond-energy dimerization, while the relaxation processes are taken into account phenomenologically. It turns out that the interband conductivity of the insulating half-filled case fits well the single-particle optical conductivity measured in various CDW systems. In the metallic regime, for the doubled Fermi vector 2k_F close to \pi/a, the conduction electrons exhibit a non-Drude low-frequency response, with the total spectral weight shared between the intraband and interband channels nearly in equal proportions. For 2k_F - \pi/a not to small, the behaviour of the conduction electrons can be described as the response of a simple Drude metal.
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