典型文献
Phase Diagram of the BCS-Hubbard Model in a Magnetic Field
文献摘要：
We propose an extended BCS-Hubbard model and investigate its ground state phase diagram in an external magnetic field.By mapping the model onto a model of spinless fermions coupled with conserving Z2 variables which are mimicked by pseudospins,the model is shown to be exactly solvable along the symmetric lines for an arbitrary on-site Hubbard interaction on the bipartite lattice.In the zero field limit,the ground states exhibit an antiferromagnetic order of pseudospins.In the large field limit,on the other hand,the pseudospins are fully polarized ordered.With the increase of the applied field,a first-order phase transition occurs between these kinds of phases when the on-site Coulomb interaction is less than a critical value Uc.Above this critical Uc,a novel intermediate phase emerges between the fully polarized and antiferromagnetic phases.The ground states in this phase are macroscopically degenerate,like in a spin ice,and the corresponding entropy scales linearly with the lattice size at zero temperature.
文献关键词：
中图分类号：
作者姓名：
Dong-Hong Xu;Yi-Cong Yu;Xing-Jie Han;Xi Chen;Kang Wang;Ming-Pu Qin;Hai-Jun Liao;Tao Xiang
作者机构：
Beijing National Laboratory for Condensed Matter Physics and Institute of Physics,Chinese Academy of Sciences,Beijing 100190,China;School of Physical Sciences,University of Chinese Academy of Sciences,Beijing 100049,China;Wuhan Institute of Physics and Mathematics,IAPMST,Chinese Academy of Sciences,Wuhan 430071,China;School of Science,Beijing University of Posts and Telecommunications,Beijing 100876,China;Key Laboratory of Artificial Structures and Quantum Control,School of Physics and Astronomy,Shanghai Jiao Tong University,Shanghai 200240,China;Songshan Lake Materials Laboratory,Dongguan 523808,China;Beijing Academy of Quantum Information Sciences,Beijing 100193,China
文献出处：
引用格式：
[1]Dong-Hong Xu;Yi-Cong Yu;Xing-Jie Han;Xi Chen;Kang Wang;Ming-Pu Qin;Hai-Jun Liao;Tao Xiang-.Phase Diagram of the BCS-Hubbard Model in a Magnetic Field)[J].中国物理快报（英文版）,2022(06):37-41
A类：
pseudospins
B类：
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AB值：
0.56639
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