Variational tensor network renormalization in imaginary time: benchmark results in the Hubbard model at finite temperature

Piotr Czarnik, Marek M. Rams, Jacek Dziarmaga

A Gibbs operator $e^{-\beta H}$ for a 2D lattice system with a Hamiltonian $H$ can be represented by a 3D tensor network, the third dimension being the imaginary time (inverse temperatu…