Hamburg 2001 – wissenschaftliches Programm
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TT: Tiefe Temperaturen
TT 15: Korrelierte Elektronensysteme Theorie I
TT 15.3: Vortrag
Dienstag, 27. März 2001, 16:15–16:30, H
Single hole dynamics in the t-J model on two- and three-leg ladders — •A. Muramatsu1, M. Brunner1,2, S. Capponi1,3, and F.F. Assaad1 — 1Institut für Theoretische Physik III, Universität Stuttgart, Pfaffenwaldring 57, D-70550 Stuttgart, Germany — 2School of Physics, The University of New South Wales, Sydney, NSW 2052, Australia — 3Université Paul Sabatier, Laboratoire de Physique Quantique, 118 route de Narbonne, 31062 Toulouse, France
The dynamics of a single hole in the t-J model on two- (2LL) and three- (3LL) leg ladders is studied using a recently developed quantum Monte Carlo algorithm. For the 2LL it is shown that in addition to the most pronounced features of the spectral function, well described by the limit of strong coupling along the rungs, a clear shadow band appears in the antibonding channel. Moreover, both the bonding band and its shadow have a finite quasiparticle (QP) weight in the thermodynamic limit. For strong coupling along the rungs of the 3LL, the low-energy spectrum in the antisymmetric channel is similar to a one-dimensional chain, whereas in the two symmetric channels it resembles the 2LL. The QP weight vanishes in the antisymmetric channel, but is finite in the symmetric one.