Dresden 2009 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 38: Correlated Electrons: Low-dimensional Systems - Models 1
TT 38.12: Vortrag
Donnerstag, 26. März 2009, 12:45–13:00, HSZ 301
Weak-coupling CT-QMC and it’s application to the Peierls transition in the quarter filled Holstein model. — •Fakher F. Assaad and Thomas C. Lang — Institut für Theoretische Physik und Astrophysik, Universität Würzburg, Germany
After briefly reviewing the weak coupling CT-QMC approach we show how to generalize it to include phonon degrees of freedom[1]. The efficiency of this approach is tested in the framework of the one-dimensional Holstein model at quarter-band filling. We show that for adiabatic phonons, a phase transitions from a Luttinger to Luther Emery liquid is triggered by the electron phonon coupling. The Luther-Emery phase is characterized by dominant 2kf charge correlations[2]. Those results stem from a detailed study of the temperature dependence of the single particle spectral function, the optical conductivity, as well as charge and spin dynamical structure factors.
[1] F.F. Assaad and T. Lang, Phys. Rev. B 76, 035116 (2007)
[2] F.F. Assaad, Phys. Rev. B 78, 155124 (2008).