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

C. B. Mendl, E. A. Nowadnick, E. W. Huang, S. Johnston, B. Moritz, T. P. Devereaux

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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.

Original languageEnglish (US)
Article number205141
JournalPhysical Review B
Volume96
Issue number20
DOIs
StatePublished - Nov 22 2017

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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