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1997 | 91 | 2 | 367-370
Article title

Ferromagnetic Ground State of Two-Band Hubbard Model with One Electron per Site

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EN
Abstracts
EN
We study the multiband mechanism to favour a ferromagnetic insulating ground state within a two-band Hubbard model. Besides perturbation theory we use exact diagonalization studies to examine the ground state of chains and 2D-lattices. According to second order perturbation theory the exact diagonalization yields a fully polarized ferromagnetic ground state, if the hopping between two ground state orbitals of neighbouring atoms t_{gg} is small and the hopping between a ground state orbital and an excited orbital t_{ge} dominates. However, in contrast to the suggestion from the second order perturbation theory this ferromagnetic state is stable only for very small hopping integrals U≫ t_{ge}>t_{gg}. For larger t _{ge} quantum interference effects lead to complex magnetic structures.
Keywords
Publisher

Year
Volume
91
Issue
2
Pages
367-370
Physical description
Dates
published
1997-02
Contributors
  • Institut für Theoretische Physik, Universität Magdeburg, P.O. Box 4120, 39016 Magdeburg, Germany
author
  • Institut für Theoretische Physik, Universität Magdeburg, P.O. Box 4120, 39016 Magdeburg, Germany
References
Document Type
Publication order reference
Identifiers
YADDA identifier
bwmeta1.element.bwnjournal-article-appv91z230kz
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