Naslov
The influence of the weak bond-energy dimerization on the single-particle optical conductivity of quasi-one-dimensional systems

Autori
Kupčić, Ivan

Izvornik
Physica B (0921-4526) 322 (2002), 1-2; 154-162

Vrsta, podvrsta i kategorija rada
Radovi u časopisima, članak, znanstveni

Ključne riječi
Optical properties; CDW materials

Sažetak
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 $2k_{;\rm F};$ 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 $2k_{;\rm F}; - \pi/a$ not to small, the behaviour of the conduction electrons can be described as the response of a simple Drude metal.

Izvorni jezik
Engleski

Znanstvena područja
Fizika

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