Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Bad metallic transport in a modified Hubbard model   Strongly correlated metals often display anomalous transport, including
$T$-linear resistivity above the Mott-Ioffe-Regel limit. We introduce a
tractable microscopic model for such 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 entirely 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. At intermediate temperatures $t \ll k_B T \lesssim U$, the
approximate $T$-linear resistivity arises from a cancellation between the
nontrivial temperature dependence of both diffusivities and thermodynamic
susceptibilities, as observed in recent transport experiments on cold atomic
gases.

2
The categories of this paper are: math
9
The categories of this paper are: nlin
12
The categories of this paper are: nucl-th
1
The categories of this paper are: cs
34
The categories of this paper are: chem-ph
18
The categories of this paper are: econ
16
The categories of this paper are: stat
32
The categories of this paper are: atom-ph
11
The categories of this paper are: hep-lat
15
The categories of this paper are: nucl-ex
25
The categories of this paper are: patt-sol
26
The categories of this paper are: bayes-an
13
The categories of this paper are: quant-ph
6
The categories of this paper are: astro-ph
14
The categories of this paper are: math-ph
17
The categories of this paper are: q-fin