Issue |
Europhys. Lett.
Volume 57, Number 2, January 2002
|
|
---|---|---|
Page(s) | 274 - 280 | |
Section | Condensed matter: electronic structure, electrical, magnetic, and optical properties | |
DOI | https://doi.org/10.1209/epl/i2002-00572-5 | |
Published online | 01 September 2002 |
Formation of energy gap in high-dimensional spin-orbital liquids
1
Department of Physics, the University of Hong Kong
Pokfulam Road, Hong Kong, PRC
2
Institute of Physics, Chinese Academy of Sciences
P. O. Box 603, Beijing 100080, PRC
3
Center for Advanced Study, Tsinghua University
Beijing 100084, PRC
Received:
24
August
2001
Accepted:
2
November
2001
A Schwinger boson mean-field theory is developed for spin liquids
in a symmetric spin-orbital model in higher dimensions. Spin,
orbital and coupled spin-orbital operators are treated equally. We
evaluate the dynamic correlation functions and collective
excitations spectra. As the collective excitations have a finite
energy gap, we conclude that the ground state is a spin-orbital
liquid with a two-fold degeneracy, which breaks the discrete
spin-orbital symmetry. Based on this conclusion, we propose that
broken symmetry or symmetric frustration instead of geometric
quantum frustration provides a new route to explore the spin
liquid states. Possible relevence of this spin liquid state to
several realistic systems, such as and
, are discussed.
PACS: 75.10.-b – General theory and models of magnetic ordering
© EDP Sciences, 2002
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