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

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:
Report Number(s):
JLAB-THY-17-2635; DOE/OR/-23177-4342; arXiv:1707.04212
Journal ID: ISSN 2469-9950; PRBMDO
Grant/Contract Number:
BU 2626/2-1; PHY-1516509; AC05-06OR23177
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)
Research Org:
Thomas Jefferson National Accelerator Facility, Newport News, VA (United States)
Sponsoring Org:
USDOE Office of Science (SC), Nuclear Physics (NP) (SC-26)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; Band gap; Density of states; Plasmons; Quantum phase transitions
OSTI Identifier:
1418744
Alternate Identifier(s):
OSTI ID: 1408174