磁场对一维Heisenberg链低能行为的影响  

EFFECT OF EXTERNAL MAGNETIC FIELD ON LOW\|ENERGY BEHAVIOR OF ONE-DIMENSIONAL HEISENBERG CHAIN 

作　　者：高阳[1] 章豫梅[1] 陈鸿[1] 

机构地区：[1]同济大学物理系,上海200092

出　　处：《物理学报》2000年第8期1586-1590,共5页Acta Physica Sinica

基　　金：国家自然科学基金!(批准号:19904007)资助的课题

摘　　要：用Jordan Wigner变换和玻色化方法研究了一维 1/2自旋Heisenberg链 .在外加磁场作用下 ,模型的Fermi速度与Fermi动量均被改变 ,从而玻色化过程也受到影响 .对一维Heisenberg链的反铁磁相 (AFM )与顺磁相 (PM )分别做了讨论 ,得出了模型基态能及磁化与外加磁场的关系并给出了公度 非公度阈值磁场h′cl及上阈值磁场hc2 .Spin\|1/2 anisotropic Heisenberg chain in longitudinal external magnetic field is studied by traditional Jordan\|Wigner transformation and bosonization method. In the presence of an external field, both Fermi velocity and Fermi momentum are changed, thus the bosonization procedure is also changed. The antiferromagnetic phase and paramagnetic phase are discussed and the dependence of ground state energy and magnetization on the field are calculated and depicted for some typical cases.

关 键 词：HEISENBERG链 磁场 强关联 低能行为 磁性 

分 类 号：O413[理学—理论物理]