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TT: Tiefe Temperaturen

TT 21: Phasendiagramm der HTSL

TT 21.3: Fachvortrag

Freitag, 28. März 2003, 11:10–11:35, HSZ304

Spin and charge dynamics of stripes in doped Mott insulators. — •Fakher Assaad¹, Valery Rousseau², Martin Feldbacher¹, Frederic Hébert³, and George Batrouni² — ¹Institut für Theoretische Physik III, Universität Stuttgart, Pfaffenwaldring 58, D-70550 Stuttgart, Germany. — ²Institut Non-Linéaire de Nice, Université de Nice-Sophia Antipolis, 1361 route des Lucioles, 06560 Valbonne, France. — ³Theoretische Physik, Universität des Saarlandes, 66041 Saarbrücken, Germany.

We study spin and charge dynamics of stripes in doped Mott insulators by considering a two-dimensional Hubbard model with N fermion flavors. For N =2 we recover the normal one-band model while for N→ ∞ a spin density wave mean-field solution. For all band fillings, lattice topologies and N= 4 n the model may be solved by means of quantum Monte Carlo methods without encountering the sign problem. At N=4 and in the vicinity of the Mott insulator we find a stripe phase. This phase has a quasiparticle gap but conducts due to long wave-length low-lying collective charge modes.