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29 March 2024
 
  » arxiv » cond-mat/0403323

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Anomalous scaling of conductivity in integrable fermion systems
P. Prelovsek ; S. El Shawish ; X. Zotos ; M. Long ;
Date 12 Mar 2004
Subject Strongly Correlated Electrons | cond-mat.str-el
AbstractWe analyze the high-temperature conductivity in one-dimensional integrable models of interacting fermions: the t-V model (anisotropic Heisenberg spin chain) and the Hubbard model, at half-filling in the regime corresponding to insulating ground state. A microcanonical Lanczos method study for finite size systems reveals anomalously large finite-size effects at low frequencies while a frequency-moment analysis indicates a finite d.c. conductivity. This phenomenon also appears in a prototype integrable quantum system of impenetrable particles, representing a strong-coupling limit of both models. In the thermodynamic limit, the two results could converge to a finite d.c. conductivity rather than an ideal conductor or insulator scenario.
Source arXiv, cond-mat/0403323
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