Conducting phase in the two-dimensional disordered Hubbard model
Physical review letters, 1999•APS
We study the temperature-dependent conductivity σ (T) and spin susceptibility χ (T) of the
two-dimensional disordered Hubbard model. Calculations of the current-current correlation
function using a quantum Monte Carlo method show that repulsion between electrons can
significantly enhance the conductivity, and at low temperatures change the sign of d σ/dT
from positive (insulating behavior) to negative (conducting behavior). This result suggests
the possibility of a metallic phase, and consequently a metal-insulator transition, in a two …
two-dimensional disordered Hubbard model. Calculations of the current-current correlation
function using a quantum Monte Carlo method show that repulsion between electrons can
significantly enhance the conductivity, and at low temperatures change the sign of d σ/dT
from positive (insulating behavior) to negative (conducting behavior). This result suggests
the possibility of a metallic phase, and consequently a metal-insulator transition, in a two …
Abstract
We study the temperature-dependent conductivity σ (T) and spin susceptibility χ (T) of the two-dimensional disordered Hubbard model. Calculations of the current-current correlation function using a quantum Monte Carlo method show that repulsion between electrons can significantly enhance the conductivity, and at low temperatures change the sign of d σ/dT from positive (insulating behavior) to negative (conducting behavior). This result suggests the possibility of a metallic phase, and consequently a metal-insulator transition, in a two-dimensional microscopic model containing both interactions and disorder. The metallic phase is a non-Fermi liquid with local moments as deduced from χ (T).
American Physical Society
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