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

Abstract

Here 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.

Authors:
 [1];  [2];  [3]
  1. Univ. of Regensburg (Germany). Inst. for Theorectical Physics
  2. Univ. of Kent, Canterbury (United Kingdom). School of Physical Sciences
  3. Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States); College of William and Mary, Williamsburg, VA (United States). Dept. of Physics
Publication Date:
Research Org.:
Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Nuclear Physics (NP) (SC-26)
OSTI Identifier:
1418744
Alternate Identifier(s):
OSTI ID: 1408174
Report Number(s):
JLAB-THY-17-2635; DOE/OR/-23177-4342; arXiv:1707.04212
Journal ID: ISSN 2469-9950; PRBMDO; TRN: US1801292
Grant/Contract Number:  
BU 2626/2-1; PHY-1516509; AC05-06OR23177
Resource Type:
Accepted Manuscript
Journal Name:
Physical Review B
Additional Journal Information:
Journal Volume: 96; Journal Issue: 20; Journal ID: ISSN 2469-9950
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; Band gap; Density of states; Plasmons; Quantum phase transitions

Citation Formats

Ulybyshev, Maksim, Winterowd, Christopher, and Zafeiropoulos, Savvas. Collective charge excitations and the metal-insulator transition in the square lattice Hubbard-Coulomb model. United States: N. p., 2017. Web. doi:10.1103/PhysRevB.96.205115.
Ulybyshev, Maksim, Winterowd, Christopher, & Zafeiropoulos, Savvas. Collective charge excitations and the metal-insulator transition in the square lattice Hubbard-Coulomb model. United States. doi:10.1103/PhysRevB.96.205115.
Ulybyshev, Maksim, Winterowd, Christopher, and Zafeiropoulos, Savvas. Thu . "Collective charge excitations and the metal-insulator transition in the square lattice Hubbard-Coulomb model". United States. doi:10.1103/PhysRevB.96.205115. https://www.osti.gov/servlets/purl/1418744.
@article{osti_1418744,
title = {Collective charge excitations and the metal-insulator transition in the square lattice Hubbard-Coulomb model},
author = {Ulybyshev, Maksim and Winterowd, Christopher and Zafeiropoulos, Savvas},
abstractNote = {Here 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.},
doi = {10.1103/PhysRevB.96.205115},
journal = {Physical Review B},
number = 20,
volume = 96,
place = {United States},
year = {2017},
month = {11}
}

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Cited by: 3 works
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