Attractive Su-Schrieffer-Heeger-Hubbard model on a square lattice away from half-filling

Xing, Bo; Feng, Chunhan; Scalettar, Richard; Batrouni, G. George; Poletti, Dario

doi:10.1103/physrevb.108.l161103

Attractive Su-Schrieffer-Heeger-Hubbard model on a square lattice away from half-filling

Journal Article · Thu Oct 12 00:00:00 EDT 2023 · Physical Review. B

DOI:https://doi.org/10.1103/physrevb.108.l161103· OSTI ID:2432281

^[1]; Feng, Chunhan ^[2]; Scalettar, Richard ^[3]; Batrouni, G. George ^[4]; Poletti, Dario ^[5]

Singapore University of Technology and Design (Singapore); UC Davis
Flatiron Institute, New York, NY (United States); University of California, Davis, CA (United States)
University of California, Davis, CA (United States)
National University of Singapore (Singapore); Université Côte d'Azur, Nice (France)
Singapore University of Technology and Design (Singapore); National University of Singapore (Singapore); CNRS-UNS-NUS-NTU International Joint Research Unit (Singapore)

The Su-Schrieffer-Heeger (SSH) model, with bond phonons modulating electron tunneling, is a paradigmatic electron-phonon model that hosts an antiferromagnetic order to bond order transition at half-filling. In the presence of a repulsive Hubbard interaction, the antiferromagnetic phase is enhanced, but the phase transition remains first order. Here, we explore the physics of the SSH model with an attractive Hubbard interaction, which hosts an interesting interplay among charge order, s-wave pairing, and bond order. Using the numerically exact determinant quantum Monte Carlo method, we show that both charge order, present at weak electron-phonon coupling, and bond order, at large coupling, give way to s-wave pairing when the system is doped. Lastly, we demonstrate that the SSH electron-phonon interaction competes with the attractive Hubbard interaction and reduces the s-wave pairing correlation.

View Accepted Manuscript (DOE)

Research Organization:: University of California, Davis, CA (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: SC0014671

OSTI ID:: 2432281

Journal Information:: Physical Review. B, Journal Name: Physical Review. B Journal Issue: 16 Vol. 108; ISSN 2469-9950

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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