| Issue |
Europhys. Lett.
Volume 55, Number 1, July 2001
|
|
|---|---|---|
| Page(s) | 66 - 72 | |
| Section | Condensed matter: electronic structure, electrical, magnetic, and optical properties | |
| DOI | https://doi.org/10.1209/epl/i2001-00382-3 | |
| Published online | 01 December 2003 | |
Transport in a classical model of a one-dimensional Mott insulator: Influence of conservation laws
Institut für Theorie der Kondensierten
Materie, Universität Karlsruhe D-76128 Karlsruhe, Germany
Received:
9
February
2001
Accepted:
17
April
2001
We study numerically how conservation laws affect the optical
conductivity 
of a slightly doped one-dimensional Mott
insulator. We investigate a regime where the average distance
between charge excitations is large compared to their thermal de
Broglie wavelength and a classical description is possible. Due to
conservation laws, the dc conductivity is infinite and the Drude
weight D is finite even at finite temperatures. Our numerical
results test and confirm exact theoretical predictions for D both
for integrable and non-integrable models. Small deviations from
integrability induce slowly decaying modes and, consequently,
low-frequency peaks in , which can be described by a
memory matrix approach.
PACS: 72.20.-i – Conductivity phenomena in semiconductors and insulators / 71.10.Pm – Fermions in reduced dimensions (anyons, composite fermions, Luttinger liquid, etc.) / 72.15.Nj – Collective modes (e.g., in one-dimensional conductors)
© EDP Sciences, 2001
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