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2015 | 127 | 2 | 201-203
Article title

Spin Chain in Magnetic Field: Limitations of the Large-N Mean-Field Theory

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Abstracts
EN
Motivated by the recent success in describing the spin and orbital spectrum of a spin-orbital chain using a large-N mean-field approximation, we apply the same formalism to the case of a spin chain in the external magnetic field. It occurs that in this case, which corresponds to N=2 in the approximation, the large-N mean-field theory cannot qualitatively reproduce the spin excitation spectra at high magnetic fields, which polarize more than 50% of the spins in the magnetic ground state. This, rather counterintuitively, shows that the physics of a spin chain can under some circumstances be regarded as more complex than the physics of a spin-orbital chain.
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Contributors
author
  • Stanford Institute for Materials and Energy Sciences, SLAC National Laboratory and Stanford University, Menlo Park, California 94025, USA
  • Institute of Theoretical Physics, Faculty of Physics, University of Warsaw, Pasteura 5, PL-02093 Warszawa, Poland
  • Advanced Photon Source, Argonne National Laboratory, Argonne, Illinois 60439, USA
  • Advanced Photon Source, Argonne National Laboratory, Argonne, Illinois 60439, USA
  • Department of Physics, Northern Illinois University, De Kalb, Illinois 60115, USA
author
  • Stanford Institute for Materials and Energy Sciences, SLAC National Laboratory and Stanford University, Menlo Park, California 94025, USA
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Document Type
Publication order reference
Identifiers
YADDA identifier
bwmeta1.element.bwnjournal-article-appv127n2010kz
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