| 自旋S=1/2反铁磁链元激发谱的量子Monte Carlo研究 |
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| 引用本文： | 柏维.自旋S=1/2反铁磁链元激发谱的量子Monte Carlo研究[J].电子科技大学学报(社会科学版),1993(4). |
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| 作者姓名： | 柏维 |
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| 作者单位： | 电子科技大学应用物理系 成都 |
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| 摘 要： | 提出一种扩展投影量子Monte Carlo方法。用该方法计算了S=1/2反铁磁自旋链(链长N=32)的元激发谱。计算结果表明元激发谱为E_k=C|sinK|,与Anderson用自旋波理论求得的E_k=|sinK|不同。它存在一个振幅修正参数C。
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| 关 键 词： | 自旋链 元激发谱 量子 蒙特卡罗法 自旋波理论 |
QUANTUM MONTE CARLO STUDY OF ELEMENTARY EXCITATION SPECTRUM OF ANTIFERROMAGNETIC CHAINS FOR THE S=1/2 CASE |
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| Bai Wei.QUANTUM MONTE CARLO STUDY OF ELEMENTARY EXCITATION SPECTRUM OF ANTIFERROMAGNETIC CHAINS FOR THE S=1/2 CASE[J].Journal of University of Electronic Science and Technology of China(Social Sciences Edition),1993(4). |
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| Authors: | Bai Wei |
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| Abstract: | This paper presents an extensive projector quantum Monte Carlo method. The elementary excitation spectrum of the S=1/2 antiferromagnetic chains (length N=32)is calculated by this method. The results show that the elementary excitation spectrum E_k=C|sinK| is different from the spectrum E_k=|sinK| of Andereson's spin-wave theory. Apparently, there exist a corrected parameter of amplitude c. |
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| Keywords: | spin chain elementary excitation spectrum quantum Monte Carlo method spin-wave theory |
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