Optical phonons in a quarter-filled one-dimensional Hubbard model
| Autor: | Philippe Maurel, Marie-Bernadette Lepetit |
|---|---|
| Rok vydání: | 2000 |
| Předmět: |
Condensed Matter::Quantum Gases
Physics Coupling constant Hubbard model Condensed matter physics Luttinger liquid Phonon Phase (matter) Condensed Matter::Strongly Correlated Electrons Strongly correlated material Condensed Matter::Mesoscopic Systems and Quantum Hall Effect Ground state Phase diagram |
| Zdroj: | Physical Review B. 62:10744-10751 |
| ISSN: | 1095-3795 0163-1829 |
| Popis: | The influence of dispersion-less quantum optical phonons on the phase diagram of a quarter-filled Hubbard chain is studied using the Density-matrix renormalization group technique. The ground state phase diagram is obtained for frequencies corresponding to the intra-molecular vibrations in organic conductors. For high vibrational modes the system is only slightly affected by the electron-phonons coupling. It remains in a Luttinger liquid phase as long as the electronic repulsion is larger than the polaronic binding energy. For low vibrational modes the phase diagram is very rich. A noticeable point is the existence of a $4k_F$ CDW phase for small values of the correlation strength. For realistic values of the electron repulsion and of the electron-phonons coupling constant a large phonons-mediated reduction of the Luttinger liquid parameter $K_\rho$ was found compared to the pure electronic model. |
| Databáze: | OpenAIRE |
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