Dresden 2003 – scientific programme
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TT: Tiefe Temperaturen
TT 2: Systeme korrelierter Elektronen I
TT 2.4: Talk
Monday, March 24, 2003, 10:45–11:00, HSZ304
Antiholons in one-dimensional t-J models — •Catia Lavalle1, Mitsuhiro Arikawa1, Sylvain Capponi2, Fakher Assaad1, and Alejandro Muramatsu1 — 1Universität Stuttgart, Pfaffenwaldring 58,70550 Stuttgart — 2Université Paul Sabatier, Laboratoire de Physique Quantique, 118 route de Narbonne, 31062 Toulouse, France
We developed a new Monte Carlo technique (Hybrid-loop MC) that is able to treat the nearest-neighbor 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 it is possible to 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. We show that antiholon excitations identified in the supersymmetric t-J model with inverse squared interaction are also clearly visible in the nearest-neighbor t-J model not only at the supersymmetric point. The results presented strongly indicate that antiholons, that are not charge conjugate of the holons, should be considered as generic excitations in the nearest-neighbor t-J model beyond spinons and holons.