Non-Fermi-liquid regime of a doped Mott insulator
Non-Fermi-liquid regime of a doped Mott insulator
We study the doping of a Mott insulator in the presence of quenched frustrating disorder in the magnitude and sign of the magnetic exchange. Two quite different doping regimes $\ensuremath{\delta}<{\ensuremath{\delta}}^{*}$ and $\ensuremath{\delta}>{\ensuremath{\delta}}^{*}$ are found, with ${\ensuremath{\delta}}^{*}\ensuremath{\simeq}J/t (J$ is the characteristic magnitude of the exchange, and t the hopping amplitude). In …