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2012 | 121 | 5-6 | 1042-1044
Article title

Charge Orderings and Phase Separations in Itinerant Fermion Systems at Half Filling

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EN
Abstracts
EN
We analyse the ground state phase diagrams of the charge orderings in narrow band materials using two effective models: (1) the spinless fermion model (t - W) with repulsive intersite interaction (W_{ij} > 0) and (2) the molecular crystal model with the coupling of electrons to intramolecular (crystal field) vibrations. We present results for the case of half filled bands for d = 2 square lattice. The calculations are performed within the (broken symmetry) Hartree-Fock approximation. The study takes into consideration the effects of frustrating next-nearest-neighbour hopping (t_2) on the charge ordered states in these systems. We focus on the two cases: (i) homogeneous phases and phase separations involving checkerboard charge ordering with the nesting vector Q= (π,π) only and (ii) homogeneous phases and phase separations involving two types of charge ordering: (a) checkerboard charge ordering with the nesting vector Q = (π,π), and (b) collinear (CL) charge ordering with Q = (0,π) or Q = (π,0).
Keywords
Contributors
author
  • Faculty of Physics, A. Mickiewicz University, Umultowska 85, 61-614 Poznań, Poland
author
  • Faculty of Physics, A. Mickiewicz University, Umultowska 85, 61-614 Poznań, Poland
author
  • Faculty of Physics, A. Mickiewicz University, Umultowska 85, 61-614 Poznań, Poland
  • Faculty of Physics, A. Mickiewicz University, Umultowska 85, 61-614 Poznań, Poland
References
  • 1. R. Micnas, J. Ranninger, S. Robaszkiewicz, Rev. Mod. Phys. 62, 113 (1990)
  • 2. S. Robaszkiewicz, G. Pawłowski, Acta Phys. Pol. A 90, 569 (1996)
  • 3. W. Czart, S. Robaszkiewicz, B. Tobijaszewska, Acta Phys. Pol. A 114, 73 (2008)
  • 4. S. Robaszkiewicz, T. Kostyrko, Physica 112B, 389 (1982); 121B, 134 (1983)
  • 5. P. Fulde, P. Thalmeir, G. Zwicknagel, Solid State Phys. 60, 1 (2006)
  • 6. K. Rościszewski, A.M. Oleś, J. Phys., Condens. Matter 15, 8363 (2003)
  • 7. H. Seo, J. Merino, H. Yoshioka, M. Ogata, J. Phys. Soc. Jpn. 75, 51009 (2006)
  • 8. W. Czart, P.R. Grzybowski, S. Robaszkiewicz, Acta Phys. Pol. A 118, 369 (2010)
  • 9. T. Kostyrko, R. Micnas, Phys. Rev. B 46, 11025 (1992)
  • 10. G.S. Uhrig, R. Vlaming, Ann. Phys. 4, 778 (1995)
Document Type
Publication order reference
Identifiers
YADDA identifier
bwmeta1.element.bwnjournal-article-appv121n5-6p15kz
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