Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2000-02-18
Phys. Rev. Lett 85, 1092 (2000).
Physics
Condensed Matter
Strongly Correlated Electrons
4 pages, accepted at PRL, discussion of behavior very close to commensurate points considerably improved
Scientific paper
10.1103/PhysRevLett.85.1092
We study the low-temperature low-frequency conductivity sigma of an interacting one dimensional electron system in the presence of a periodic potential. The conductivity is strongly influenced by conservation laws, which, we argue, need be violated by at least two non-commuting Umklapp processes to render sigma finite. The resulting dynamics of the slow modes is studied within a memory matrix approach, and we find exponential increase as the temperature is lowered, sigma = (Delta n)^2 e^{T_0/(N T)} close to commensurate filling M/N, Delta n=n-M/N << 1, and sigma = e^{(T'_0/T)^{2/3}} elsewhere.
Andrei Natan
Rosch Achim
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