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Collective charge excitations and the metal-insulator transition in the square lattice Hubbard-Coulomb model

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Ulybyshev, Maksim ; Winterowd, Christopher ; Zafeiropoulos, Savvas
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Date of publication of this fulltext: 20 Mar 2019 13:10


In this article, we discuss the nontrivial collective charge excitations (plasmons) of the extended square lattice Hubbard model. Using a fully nonperturbative approach, we employ the hybrid Monte Carlo algorithm to simulate the system at half-filling. A modified Backus-Gilbert method is introduced to obtain the spectral functions via numerical analytic continuation. We directly compute the ...


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