Original scientific paper
Optical properties within the Q1D multiband models - the transverse equation of motion approach
Ivan Kupčić
; Department of Physics, Faculty of Science, P.O.B. 331, HR-10 002 Zagreb, Croatia
Slaven Barišić
; Department of Physics, Faculty of Science, P.O.B. 331, HR-10 002 Zagreb, Croatia
Abstract
The electrodynamic features of the multiband model are examined using the transverse equation of motion approach in order to give the explanation of several longstanding problems. It turns out that the exact summation of the most singular terms in powers of 1/ωn leads to the total optical conductivity which, in the zerofrequency limit, reduces to the results of the Boltzmann equation, both for the metallic and semiconducting two-band regime. The detailed calculations have been carried out for the quasi-one-dimensional (Q1D) two-band model corresponding to the imperfect charge-density-wave (CDW) nesting. It is also shown that the results of the present treatment of the impurity-scattering processes for the DC conductivity of the ordered CDW state are in agreement with the experimental observation. Finally, the DC and optical conductivity are calculated numerically for a few typical Q1D cases.
Keywords
optical properties; CDW systems; multiband models; transverse response theory
Hrčak ID:
301944
URI
Publication date:
1.3.2005.
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