| Issue |
Europhys. Lett.
Volume 63, Number 4, August 2003
|
|
|---|---|---|
| Page(s) | 569 - 575 | |
| Section | Condensed matter: electronic structure, electrical, magnetic, and optical properties | |
| DOI | https://doi.org/10.1209/epl/i2003-00553-2 | |
| Published online | 01 November 2003 | |
Spin and charge dynamics of stripes in doped Mott insulators
1
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
Received:
25
November
2002
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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