非对称性Anderson晶格模型中的磁性相变研究  

Magnetic Transition in Non-Symmetric Anderson Lattice Model

作　　者：黎欢 

机构地区：[1]桂林理工大学,广西桂林

出　　处：《凝聚态物理学进展》2019年第1期23-31,共9页Advances in Condensed Matter Physics

基　　金：国家自然科学基金(批准号:11764010);广西自然科学基金(批准号:2017GXNSFAA198169)资助的课题。

摘　　要：Anderson晶格模型是描述重费米子系统的重要理论模型,而隶玻色子方法是求解该模型的常用方法。然而,通常的Kotliar-Ruckenstein隶玻色子方法只能处理该模型的粒子–空穴对称情形。本文将Kotliar-Ruckenstein方法加以推广,使之能够处理偏离粒子–空穴对称的非对称情形,并用之研究了非对称性Anderson晶格模型中的磁性相变,展示了晶格维度、电子跳迁系数、库仑关联强度、电子杂化强度、局域电子能级等多种参数对磁性相变边界的影响。Anderson lattice model, which can be solved by the widely used slave-boson method, is a standard model to describe the heavy-fermion systems. However, the normal Kotliar-Ruckenstein slave-boson method is limited to the case with particle-hole symmetry, particular in investigating the magnetic phase in Anderson lattice model. In this paper, the Kotliar-Ruckenstein method is generalized to include the non-symmetric case which violates the particle-hole symmetry. Then, the magnetic phase boundary in Anderson lattice model is studied as a function of lattice dimension, electron-hopping amplitudes, Coulomb correlation, electron hybridization and local energy level.

关 键 词：重费米子 磁性相变 相图 

分 类 号：R73[医药卫生—肿瘤]