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Temperature Dependence of Energy Gaps in Spin-1/2 Dimerized Heisenberg Chain |
| JIANG Xue-Fan1,3;XING Ding-Yu1;CHEN Hong2 |
| 1National Laboratory of Solid State Microstructures and Department of Physics, Nanjing University, Nanjing 210093
2Pohl Institute of Solid State Physics and Department of Physics, Tongji University, Shanghai 200092
3Department of Physics, Changshu College, Changshu 215500
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| Cite this article: |
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JIANG Xue-Fan, XING Ding-Yu, CHEN Hong 2002 Chin. Phys. Lett. 19 560-562 |
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Abstract We present a method which combines a thermal coherent state approach with a self-consistent quantum theory to investigate the spin-1/2 dimerized antiferromagnetic Heisenberg chain. It is found that both excitation gaps between the ground state and two lowest excited modes, the triplet one-magnon excitation and the singlet two-magnon bound state decrease monotonically with increasing temperature. Our results are consistent with those obtained from the other approximations.
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| Keywords:
75.10.Jm
75.10.Hk
75.40.Mg
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Published: 01 April 2002
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| PACS: |
75.10.Jm
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(Quantized spin models, including quantum spin frustration)
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75.10.Hk
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(Classical spin models)
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75.40.Mg
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(Numerical simulation studies)
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