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。
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.
出处
《电子科技大学学报》
EI
CAS
CSCD
北大核心
1993年第4期434-436,共3页
Journal of University of Electronic Science and Technology of China
关键词
自旋链
元激发谱
量子
蒙特卡罗法
spin chain
elementary excitation spectrum
quantum
Monte Carlo method
spin-wave theory
