Showing papers on "Charge transfer insulators published in 1998"
TL;DR: In this article, the effects of randomness on interacting fermionic systems in one dimension are investigated by quantum Monte Carlo techniques, and the quantum phase transition due to randomness is observed associated with the collapse of the charge ordering.
Abstract: Effects of randomness on interacting fermionic systems in one dimension are investigated by quantum Monte Carlo techniques. At first, interacting spinless fermions are studied whose ground state shows charge ordering. Quantum phase transition due to randomness is observed associated with the collapse of the charge ordering. We also treat random Hubbard model focusing on the Mott gap. Although the randomness closes the Mott gap and low-lying states are created, which is observed in the charge compressibility, no (quasi-)Fermi-surface singularity is formed. It implies localized nature of the low-lying states.
17 citations
TL;DR: In this article, the anomalous metallic state (AMS) of doped Mott insulators is analyzed based on the slave-boson mean-field approximation to the t-J model.
15 citations
TL;DR: In this paper, a description of transport hopping at the Fermi surface in insulators is presented in which the role of internal fields up to the quadrupole term is emphasized, and the conductivity at low applied fields obeys a law, with varying from 1/2 to 1/4 as the temperature is raised.
Abstract: A description of transport hopping processes at the Fermi surface in insulators is presented in which the role of internal fields is emphasized. Taking account of these fields up to the quadrupole term, we find that the conductivity at low applied fields obeys a law, with varying from 1/2 to 1/4 as the temperature is raised. Typical orders of magnitude , and for the field, the quadrupole moment and the dipole length respectively can be obtained from experimental data in the and regimes.
3 citations