Doping dependence of ordered phases and emergent quasiparticles in the doped Hubbard-Holstein model

Document Type

Article

Publication Date

11-22-2017

Abstract

We present determinant quantum Monte Carlo simulations of the hole-doped single-band Hubbard-Holstein model on a square lattice, to investigate how quasiparticles emerge when doping a Mott insulator (MI) or a Peierls insulator (PI). The MI regime at large Hubbard interaction U and small relative e-ph coupling strength λ is quickly suppressed upon doping, by drawing spectral weight from the upper Hubbard band and shifting the lower Hubbard band towards the Fermi level, leading to a metallic state with emergent quasiparticles at the Fermi level. On the other hand, the PI regime at large λ and small U persists out to relatively high doping levels. We study the evolution of the d-wave superconducting susceptibility with doping, and find that it increases with lowering temperature in a regime of intermediate values of U and λ.

Identifier

85039934590 (Scopus)

Publication Title

Physical Review B

External Full Text Location

https://doi.org/10.1103/PhysRevB.96.205141

e-ISSN

24699969

ISSN

24699950

Issue

20

Volume

96

Grant

DE-AC02-05CH11231

Fund Ref

U.S. Department of Energy

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