Ab-initio study of interacting fermions at finite temperature with neural canonical transformation. (arXiv:2105.08644v2 [cond-mat.str-el] UPDATED)

We present a variational density matrix approach to the thermal properties of
interacting fermions in the continuum. The variational density matrix is
parametrized by a permutation equivariant many-body unitary transformation
together with a discrete probabilistic model. The unitary transformation is
implemented as a quantum counterpart of neural canonical transformation, which
incorporates correlation effects via a flow of fermion coordinates. As the
first application, we study electrons in a two-dimensional quantum dot with an
interaction-induced crossover from Fermi liquid to Wigner …

ab arxiv canonical study transformation