Spin-Peierls ground states and frustration in a multi-band Peierls-Hubbard model
H. Roeder, A.R. Bishop, and J. Tinka Gammel
TL;DR
This paper explores the complex ground states in a multi-band Peierls-Hubbard model with both electron-phonon and electron-electron interactions, revealing spin-Peierls and frustrated phases through numerical analysis.
Contribution
It introduces a detailed numerical study of a one-dimensional two-band model considering both interactions, uncovering new frustrated and spin-Peierls ground states.
Findings
Identification of spin-Peierls ground states
Discovery of long-period frustrated states
Relevance to antiferromagnetic models
Abstract
We discuss the consequences of including both electron-phonon and electron-electron couplings in multi-band models, focusing on numerical studies of a one-dimensional two-band model in the intermediate regime for both coupling strengths. Spin-Peierls as well as long-period, frustrated ground states are identified, reminisent of those found in antiferromagnetic next-nearest neighbor (ANNNI) models. We speculate on experimentally observable signatures of this rich phase diagram. 1992 PACS: 75.30.Fv, 71.45.Lr, 71.38+i, 64.70.Rh
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