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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 | Abstract: | We 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 | Services: | Forum | Review | PDF | Favorites |
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