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

Motivated by the recent success in describing the spin and orbital spectrum of a spin-orbital chain using a large-N mean-field approximation [Phys. Rev. B 91, 165102 (2015)], 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.
Authors:
 [1] ;  [2] ;  [3] ;  [4]
  1. Univ. of Warsaw (Poland). Inst. of Theoretical Physics
  2. Argonne National Lab. (ANL), Argonne, IL (United States). Advanced Photon Source (APS)
  3. Northern Illinois Univ., DeKalb, IL (United States). Dept. of Physics
  4. SLAC National Accelerator Lab., Menlo Park, CA (United States). Stanford Inst. for Materials and Energy Sciences
Publication Date:
OSTI Identifier:
1193711
Grant/Contract Number:
DE-AC02-76SF00515; DE-AC02-06CH11357; DE- FG02-03ER46097
Type:
Accepted Manuscript
Journal Name:
Acta Physica Polonica, Series A
Additional Journal Information:
Journal Volume: 127; Journal Issue: 2; Journal ID: ISSN 0587-4246
Publisher:
Jagiellonian University
Research Org:
SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States)
Sponsoring Org:
USDOE Office of Science (SC); Polish National Science Center
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS