Regensburg 2002 – wissenschaftliches Programm

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TT: Tiefe Temperaturen

TT 13: Systeme korrelierter Elektronen: Theorie I

TT 13.6: Vortrag

Dienstag, 12. März 2002, 16:00–16:15, H20

Spectral properties of the 1D t-J model at finite doping — •Catia Lavalle, Michael Brunner, Fakher F. Assaad, and Alejandro Muramatsu — Institut für Theoretische Physik III, Universität Stuttgart,Pfaffenwaldring 57, D-70550 Stuttgart

We developed a new Monte Carlo technique (Hybrid-loop MC) that is able to treat the t-J model at finite doping and incorporates the advantages of the Projector MC (no limitation in the measurable observable) and of the Loop MC (absence of critical slowing down). Using this new technique we are able study static and dynamical properties of the t-J model in 1D at finite doping in the whole range of parameters (J/t) without sign problem. Here we present the study of the phase diagram (density vs J) [1] and of the spectral functions (photoemission and inverse photoemission) of the model in the different phases (repulsive and attractive Luttinger liquid, and phase separation) at low doping.

[1] M. Ogata, M. U. Luchini, S. Sorella and F. F. Assaad Phys. Rev. Lett. 66, 2388 (1991)