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.
Let us consider the matrix-valued functionA(t) defined on the interval 0≤t≤t max, and expand it in terms of the Chebyshev polynomialsT k(x) = cos(karccosx)
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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.