| S=1/2反铁磁海森堡交替链的能隙 |
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| 引用本文： | 吴银忠.S=1/2反铁磁海森堡交替链的能隙[J].安徽师范大学学报(自然科学版),1999,22(2):127-130. |
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| 作者姓名： | 吴银忠 |
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| 作者单位： | 常熟高等专科学校物理系,江苏,常熟,215500 |
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| 基金项目： | 江苏省重点实验室基金 |
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| 摘 要： | 应用Ｓ＝１／２量子键算符方法研究了Ｓ＝１／２反铁磁海森堡交替链的激发谱,该方法比严格 对角化方法简单而有效,当Ｊ‘＝Ｊ时,第一激发态和基态之间能隙为零,这与各向同性的Ｓ＝１／２反铁磁海森堡链的结论一致。当Ｊ’＝－Ｊ时,第一激发态和基态之间能隙为０．５８８８Ｊ。
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| 关 键 词： | 反铁磁海森堡链 键交替 能隙 |
| 修稿时间： | 1998-11-11 |
ENERGY GAP BETWEEN THE FIRST EXCITED STATE AND THE GROUND STATE IN THE SPIN-1/2 ANTIFERROMAGNETIC CHAIN WITH BOND AITERNATION |
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| WU Yin-zhong.ENERGY GAP BETWEEN THE FIRST EXCITED STATE AND THE GROUND STATE IN THE SPIN-1/2 ANTIFERROMAGNETIC CHAIN WITH BOND AITERNATION[J].Journal of Anhui Normal University(Natural Science Edition),1999,22(2):127-130. |
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| Authors: | WU Yin-zhong |
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| Abstract: | In this paper,the bond operator representation of quantum spin S 1/2 is used to study the spin 1/2 bond alternating Heisenberg chain. The energy gap between the ground state and the first excited state is obtained. Our result is very close to the result of the exact diagonalization method. |
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| Keywords: | antiferromagnetic heisenberg chain bond alternation energy gap |
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