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Phys. Rev. B 73, 174525 (2006) [16 pages]

Slave-boson approach to the metallic stripe phases with large unit cells

Marcin Raczkowski
Marian Smoluchowski Institute of Physics, Jagellonian University, Reymonta 4, PL-30059 Kraków, Poland and Laboratoire CRISMAT, UMR CNRS-ENSICAEN(ISMRA) 6508, 6 Bld. du Maréchal Juin, F-14050 Caen, France

Raymond Frésard
Laboratoire CRISMAT, UMR CNRS-ENSICAEN(ISMRA) 6508, 6 Bld. du Maréchal Juin, F-14050 Caen, France

Andrzej M. Oles
Marian Smoluchowski Institute of Physics, Jagellonian University, Reymonta 4, PL-30059 Kraków, Poland and Max-Planck-Institut für Festkörperforschung, Heisenbergstrasse 1, D-70569 Stuttgart, Germany
Received 10 February 2006; revised 18 April 2006; published 26 May 2006

Using a rotationally invariant version of the slave-boson approach in spin space we analyze the stability of stripe phases with large unit cells in the two-dimensional Hubbard model. This approach allows one to treat strong electron correlations in the stripe phases relevant in the low doping regime, and gives results representative of the thermodynamic limit. Thereby we resolve the longstanding controversy concerning the role played by the kinetic energy in stripe phases. While the transverse hopping across the domain walls yields the largest kinetic energy gain in the case of the insulating stripes with one hole per site, the holes propagating along the domain walls stabilize the metallic vertical stripes with one hole per two sites, as observed in the cuprates. We also show that a finite next-nearest neighbor hopping t[prime] can tip the energy balance between the filled diagonal and half-filled vertical stripes, which might explain a change in the spatial orientation of stripes observed in the high Tc cuprates at the doping x~=1/16.

©2006 The American Physical Society

URL: http://link.aps.org/doi/10.1103/PhysRevB.73.174525
DOI: 10.1103/PhysRevB.73.174525
PACS: 74.72.-h; 71.10.Fd; 71.45.Lr; 75.10.Lp
  • 74.72.-h
    Cuprate superconductors (high-Tc and insulating parent compounds)
  • 71.10.Fd
    Lattice fermion models (condensed matter) including Hubbard model, etc
  • 71.45.Lr
    Charge-density-wave systems
  • 75.10.Lp
    Band and itinerant models (magnetism)
  • YEAR: 2006
KEYWORDS: high-temperature superconductors, strongly correlated electron systems, electron correlations, Hubbard model, hopping conduction, magnetic domain walls

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