Lange F, Fehske H (2024)
Publication Language: English
Publication Type: Journal article
Publication year: 2024
Book Volume: 14
Article Number: 18050
DOI: 10.1038/s41598-024-68811-y
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.
APA:
Lange, F., & Fehske, H. (2024). Metal-insulator transition of spinless fermions coupled to dispersive optical bosons. Scientific Reports, 14. https://doi.org/10.1038/s41598-024-68811-y
MLA:
Lange, Florian, and Holger Fehske. "Metal-insulator transition of spinless fermions coupled to dispersive optical bosons." Scientific Reports 14 (2024).
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