Phase Diagram of the Spin-1/2 Heisenberg Alternating Chain in a Magnetic Field  

作　　者：Wei-Xia Chen Jie Ren Wen-Long You Xiang Hao Yin-Zhong Wu 陈维霞;任杰;尤文龙;郝翔;吴银忠(School of Physical Science and Technology, Soochow University, Suzhou 215006, China;Department of Physics and Jiangsu Laboratory of Advanced Functional Material, Changshu Institute of Technology, Changshu 215500, China;Department of Physics, School of Mathematics and Physics, Suzhou University of Science of Technology, Suzhou 215009, China)

机构地区：[1]School of Physical Science and Technology, Soochow University, Suzhou 215006, China [2]Department of Physics and Jiangsu Laboratory of Advanced Functional Material, Changshu Institute of Technology, Changshu 215500, China [3]Department of Physics, School of Mathematics and Physics, Suzhou University of Science of Technology, Suzhou 215009, China

出　　处：《Communications in Theoretical Physics》2019年第8期1029-1035,共7页理论物理通讯（英文版）

基　　金：Supported by the National Natural Science Foundation of China under Grant Nos.11384012 and 11474211

摘　　要：By using the infinite time-evolving block decimation, we study quantum fidelity and entanglement entropy in the spin-1/2 Heisenberg alternating chain under an external magnetic field.The effects of the magnetic field on the fidelity are investigated, and its relation with the quantum phase transition(QPT) is analyzed.The phase diagram of the model is given accordingly, which supports the Haldane phase, the singlet-dimer phase, the Luttinger liquid phase and the paramagnetic phase.The scaling of entanglement entropy in the gapless Luttinger liquid phase is studied, and the central charge c = 1 is obtained.We also study the relationship between the quantum coherence, string order parameter and QPTs.Results obtained from these quantum information observations are consistent with the previous reports.

关 键 词：iTEBD dimerized XX MODEL 

分 类 号：O3[理学—力学]