19 citations · 31 across the 2 of their papers we have counts for
3 papers
Taming the sign problem of the finite density Hubbard model via Lefschetz thimbles
Maksim Ulybyshev, Christopher Winterowd, Savvas Zafeiropoulos
We study the sign problem in the Hubbard model on the hexagonal lattice away from half-filling using the Lefschetz thimbles method. We identify the saddle points, reduce their amou…
Lefschetz thimbles decomposition for the Hubbard model on the hexagonal lattice
Maksim Ulybyshev, Christopher Winterowd, Savvas Zafeiropoulos
We propose a framework to study the properties of the Lefschetz thimbles decomposition for lattice fermion models approaching the thermodynamic limit. The proposed set of algorithm…
Collective charge excitations and the metal-insulator transition in the square lattice Hubbard-Coulomb model
Maksim Ulybyshev, Christopher Winterowd, Savvas Zafeiropoulos
In this article, we discuss the non-trivial collective charge excitations (plasmons) of the extended square-lattice Hubbard model. Using a fully non-perturbative approach, we emplo…