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cond-mat.str-el2018★ 28 cited
Solution of the "sign problem" for the half filled Hubbard-Holstein model
Seher Karakuzu, Kazuhiro Seki, Sandro Sorella
We show that, by an appropriate choice of auxiliary fields and exact integration of the phonon degrees of freedom, it is possible to define a 'sign-free' path integral for the so c…
cond-mat.str-el2018★ 12 cited
Study of the superconducting order parameter in the negative- 2D-Hubbard model by grand-canonical twist-averaged boundary conditions
Seher Karakuzu, Kazuhiro Seki, Sandro Sorella
By using variational Monte Carlo and auxiliary-field quantum Monte Carlo methods, we perform an accurate finite-size scaling of the -wave superconducting order parameter and the…