A new non-engineered SU(4) fermion model exhibits high-temperature charge-4e superconductivity via unbiased quantum Monte Carlo, with Tc increasing linearly with coupling and a BKT transition marked by a charge-4e stiffness jump.
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Finite temperature strongly enhances low-frequency optical conductivity near the localization transition in the Aubry-André model via thermal activation of Pauli-blocked transitions between resonant van Hove singularities.
Impurity-scattering-induced coherence decay produces finite longitudinal conductivity in Berry-curvature-dominated topological insulators without Fermi-level carriers, with linear impurity scaling and 1/T temperature dependence.
Three Transformer backflow fermionic wave functions for the finite-doping Hubbard model converge, after accuracy improvements, to the same state with coexisting superconducting and stripe orders, demonstrating that variational energy is insufficient to identify the ground state.
In the α-T3 lattice with on-site asymmetry, mean-field theory shows a superconducting gap that grows as a power law with interaction strength at flat-band filling, while the geometric part of the superfluid weight grows linearly and is enhanced by tuning α.
In the 2D attractive Hubbard model, Tc is enhanced near Van Hove singularities only for weak interactions, while the global maximum Tc occurs at intermediate coupling away from the singularity.
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Metalization of topological insulators
Impurity-scattering-induced coherence decay produces finite longitudinal conductivity in Berry-curvature-dominated topological insulators without Fermi-level carriers, with linear impurity scaling and 1/T temperature dependence.