Volume 63, Number 4, August 2003
|Page(s)||569 - 575|
|Section||Condensed matter: electronic structure, electrical, magnetic, and optical properties|
|Published online||01 November 2003|
Spin and charge dynamics of stripes in doped Mott insulators
Institut für Theoretische Physik III, Universität Stuttgart Pfaffenwaldring 58, D-70550 Stuttgart, Germany
2 Max Planck Institute for Solid State Research Heisenbergstr. 1, D-70569 Stuttgart, Germany
3 Institut Non-Linéaire de Nice, Université de Nice-Sophia Antipolis 1361 route des Lucioles, 06560 Valbonne, France
4 Theoretische Physik, Universität des Saarlandes - 66041 Saarbrücken, Germany
Accepted: 10 June 2003
We study spin and charge dynamics of stripes in doped Mott insulators by considering a two-dimensional Hubbard model with N fermion flavors. For we recover the normal one-band model while for a spin density wave mean-field solution. For all band fillings, lattice topologies and , the model may be solved by means of quantum Monte Carlo methods without encountering the sign problem. At and in the vicinity of the Mott insulator we find a stripe phase. This phase has a quasiparticle gap but conducts due to long-wavelength low-lying collective charge modes.
PACS: 71.27.+a – Strongly correlated electron systems; heavy fermions / 71.10.Fd – Lattice fermion models (Hubbard model, etc.)
© EDP Sciences, 2003
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