Metal-insulator transition of spinless fermions coupled to dispersive optical bosons.

Journal

Scientific reports

ISSN: 2045-2322

Titre abrégé: Sci Rep

Pays: England

ID NLM: 101563288

Informations de publication

Date de publication:
05 Aug 2024

Historique:

received: 10 04 2024

accepted: 29 07 2024

medline: 6 8 2024

pubmed: 6 8 2024

entrez: 5 8 2024

Statut: epublish

Résumé

Including the previously ignored dispersion of phonons we revisit the metal-insulator transition problem in one-dimensional electron-phonon systems on the basis of a modified spinless fermion Holstein model. Using matrix-product-state techniques we determine the global ground-state phase diagram in the thermodynamic limit for the half-filled band case, and show that in particular the curvature of the bare phonon band has a significant effect, not only on the transport properties characterized by the conductance and the Luttinger liquid parameter, but also on the phase space structure of the model as a whole. While a downward curved (convex) dispersion of the phonons only shifts the Tomonaga-Luttinger-liquid to charge-density-wave quantum phase transition towards stronger EP coupling, an upward curved (concave) phonon band leads to a new phase-separated state which, in the case of strong dispersion, can even completely cover the charge-density wave. Such phase separation does not occur in the related Edwards fermion-boson model.

Identifiants

DOI: 10.1038/s41598-024-68811-y PMID: 39103429

pubmed: 39103429

doi: 10.1038/s41598-024-68811-y

pii: 10.1038/s41598-024-68811-y

doi:

Types de publication

Journal Article

Langues

eng

Sous-ensembles de citation

Pagination

18050

Subventions

Organisme : German federal and state governments

ID : NHR@FAU

Informations de copyright

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