Ulybyshev, Maksim and Winterowd, Christopher and Zafeiropoulos, Savvas (2017) Collective charge excitations and the metal-insulator transition in the square lattice Hubbard-Coulomb model. PHYSICAL REVIEW B, 96 (20): 205115. ISSN 2469-9950, 2469-9969
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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 single-particle density of states which demonstrates the formation of Hubbard bands in the strongly correlated phase. The momentum-resolved charge susceptibility also is computed on the basis of the Euclidean charge-density-density correlator. In agreement with previous extended dynamical mean-field theory studies, we find that, at high strength of the electron-electron interaction, the plasmon dispersion develops two branches.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | NARROW ENERGY-BANDS; MEAN-FIELD THEORY; ELECTRON CORRELATIONS; GW METHOD; EQUATIONS; NOISE; QCD; |
| Subjects: | 500 Science > 530 Physics |
| Divisions: | Physics > Institute of Theroretical Physics |
| Depositing User: | Dr. Gernot Deinzer |
| Date Deposited: | 14 Dec 2018 13:19 |
| Last Modified: | 28 Feb 2019 10:15 |
| URI: | https://pred.uni-regensburg.de/id/eprint/1857 |
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