Synergistic Polaron Formation in the Hubbard-Holstein Model at Small Doping

Journal Article · Sun Jan 01 00:00:00 EST 2006 · Physical Review Letters

DOI:https://doi.org/10.1103/PhysRevLett.97.056402· OSTI ID:931938

Macridin, Alexandru ^[1]; Moritz, Brian ^[2]; Jarrell, Mark ^[1]; Maier, Thomas A ^[3]

---

1. University of Cincinnati
2. University of Waterloo, Canada
3. ORNL

We study the effect of dynamical Holstein phonons on the physics of the Hubbard model at small doping using the dynamical cluster approximation. Non-local antiferromagnetic correlations are found to significantly enhance the electron-phonon coupling, resulting in polaron formation for moderate coupling strengths. At finite doping, the electron-phonon coupling is found to strongly enhance the non-local spin correlations, indicating a synergistic interplay between the electron- phonon coupling and antiferromagnetic correlations. Although it enhances the pairing interaction, the electron-phonon coupling is found to decrease the superconducting transition temperature, due to the reduction in the quasiparticle fraction.

• Research Organization: Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Center for Nanophase Materials Sciences (CNMS); Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). National Center for Computational Sciences (NCCS)
• Sponsoring Organization: USDOE Office of Science (SC)
• DOE Contract Number: DE-AC05-00OR22725
• OSTI ID: 931938
• Journal Information: Physical Review Letters, Vol. 97, Issue 5; ISSN 0031-9007
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
ELECTRON-PHONON COUPLING
HUBBARD MODEL
PAIRING INTERACTIONS
PHONONS
PHYSICS
POLARONS
SPIN
TRANSITION TEMPERATURE