A weak-coupling tensor cross interpolation impurity solver for nonequilibrium DMFT approximates integrands in tensor-train form to mitigate the sign problem, matching exact benchmarks and reproducing thermalization in the Hubbard model.
We want an extrapolation procedure which ensures that the extrapolated function is differentiable att= 0 and decays exponentially ast→ −∞
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Weak-coupling tensor cross interpolation impurity solver for nonequilibrium dynamical mean-field theory
A weak-coupling tensor cross interpolation impurity solver for nonequilibrium DMFT approximates integrands in tensor-train form to mitigate the sign problem, matching exact benchmarks and reproducing thermalization in the Hubbard model.