Pairing from strong repulsion in triangular lattice Hubbard model

Zhang, Shang -Shun; Zhu, Wei; Batista, Cristian D.

doi:10.1103/PhysRevB.97.140507

Title: Pairing from strong repulsion in triangular lattice Hubbard model

Journal Article · 20 April 2018 · Physical Review B

DOI: https://doi.org/10.1103/PhysRevB.97.140507 · OSTI ID:1477721

Zhang, Shang -Shun ^[1];

^[2]; Batista, Cristian D. ^[3]

Univ. of Tennessee, Knoxville, TN (United States)
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Univ. of Tennessee, Knoxville, TN (United States); Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)

Here, we propose a pairing mechanism between holes in the dilute limit of doped frustrated Mott insulators. Hole pairing arises from a hole-hole-magnon three-body bound state. This pairing mechanism has its roots on single-hole kinetic energy frustration, which favors antiferromagnetic (AFM) correlations around the hole. We demonstrate that the AFM polaron (hole-magnon bound state) produced by a single hole propagating on a field-induced polarized background is strong enough to bind a second hole. The effective interaction between these three-body bound states is repulsive, implying that this pairing mechanism is relevant for superconductivity.

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Research Organization:: Los Alamos National Lab. (LANL), Los Alamos, NM (United States)

Sponsoring Organization:: LDRD; USDOE

Grant/Contract Number:: AC52-06NA25396

OSTI ID:: 1477721

Report Number(s):: LA-UR--17-28927

Journal Information:: Physical Review B, Journal Name: Physical Review B Journal Issue: 14 Vol. 97; ISSN 2469-9950; ISSN PRBMDO

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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