Dominant particle-hole contributions to the phonon dynamics in the spinless one-dimensional Holstein model

In the spinless Holstein model at half-filling the coupling of electrons to phonons is responsible for a phase transition from a metallic state at small coupling to a Peierls distorted insulated state when the electron-phonon coupling exceeds a critical value. For the adiabatic case of small phonon...

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Bibliographic Details
Published in:Europhysics letters 2006-11, Vol.76 (4), p.644-650, Article 644
Main Authors: Sykora, S, Hübsch, A, Becker, K. W
Format: Article
Language:English
Subjects:
71.10.Fd
71.30.+h
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Summary:In the spinless Holstein model at half-filling the coupling of electrons to phonons is responsible for a phase transition from a metallic state at small coupling to a Peierls distorted insulated state when the electron-phonon coupling exceeds a critical value. For the adiabatic case of small phonon frequencies, the transition is accompanied by a phonon softening at the Brillouin-zone boundary whereas a hardening of the phonon mode occurs in the anti-adiabatic case. The phonon dynamics studied in this letter do not only reveal the expected renormalization of the phonon modes but also show remarkable additional contributions due to electronic particle-hole excitations.
ISSN:0295-5075
1286-4854
DOI:10.1209/epl/i2006-10327-x