Münster 1999 – wissenschaftliches Programm

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SYMC: Symposium Neue Entwicklungen in Quanten-Monte-Carlo-Simulationen

SYMC 1: Neue Entwicklungen in Quanten-Monte-Carlo-Simulationen I

SYMC 1.4: Vortrag

Mittwoch, 24. März 1999, 15:50–16:05, Ger

Dynamical properties of the t-J model — •Michael Brunner, Catia Lavalle, Fakher Assaad, and Alejandro Muramatsu — Institut f"ur Theoretische Physik III, Universit"at Stuttgart, Pfaffenwaldring 57, 70550 Stuttgart

We present results for the t-J model doped with a small number of holes on lattices up to N=16 × 16 sites and 2≥ J/t≥ 0.4 using a new projector algorithm for the t−J model, where the update of the spins is performed by a cluster algorithm. Dynamical properties like A(k,ω) are obtained by analytic continuation of data in imaginary time with the maximum entropy method. Comparison of A(k,ω) with the dispersion obtained by other methods [1] shows good agreement for the case of a single hole. We are able to confirm a flat band at the (π,0)-point and a minimum at (π /2,π /2) in the hole picture. Moreover an incoherent band is observed at higher energies.

• [1] E. Dagotto et al., Phys. Rev. Lett. 73, 728 (1994)