自旋S=1/2反铁磁链元激发谱的量子Monte Carlo研究  

QUANTUM MONTE CARLO STUDY OF ELEMENTARY EXCITATION SPECTRUM OF ANTIFERROMAGNETIC CHAINS FOR THE S=1/2 CASE

作　　者：柏维[1] 

机构地区：[1]电子科技大学应用物理系,成都610054

出　　处：《电子科技大学学报》1993年第4期434-436,共3页Journal of University of Electronic Science and Technology of China

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.

关 键 词：自旋链 元激发谱 量子 蒙特卡罗法 

分 类 号：O482.525[理学—固体物理]