Speaker
Connie Mousatov
(Stanford)
Description
Strongly correlated metals often display anomalous
transport, including T-linear resistivity above the
Mott-Ioffe-Regel limit. We introduce a tractable microscopic
model for bad metals, by supplementing the well-known
Hubbard model --- with hopping t and on-site repulsion U ---
with a `screened Coulomb' interaction between charge
densities that decays exponentially with spatial separation.
This interaction lifts the extensive degeneracy in the
spectrum of the t=0 Hubbard model, allowing us to fully
characterize the small t electric, thermal and
thermoelectric transport in our strongly correlated model.
Throughout the phase diagram we observe T-linear resistivity
above the Mott-Ioffe-Regel limit, together with strong
violation of the Weidemann-Franz law and a large thermopower
that can undergo sign change.
