Quantum phase transitions in two-dimensional strongly correlated fermion systems

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• 作者：An Bao 保安 ; Yao-Hua Chen 陈耀勿/a> ; Heng-Fu Lin 林恒礿/a> ; Hai-Di Liu 刘海轿/a>…
• 关键词：quantum phase transition ; two ; dimensional lattices ; fermions ; cellular dynamical mean ; field theory ; continuous ; time quantum Monte Carlo
• 刊名：Frontiers of Physics
• 出版年：2015
• 出版时间：October 2015
• 年：2015
• 卷：10
• 期：5
• 全文大小：1,702 KB
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• 作者单位：An Bao 保安 (1) (3)
  Yao-Hua Chen 陈耀华 (2)
  Heng-Fu Lin 林恒福 (2)
  Hai-Di Liu 刘海迪 (2)
  Xiao-Zhong Zhang 章晓中 (1)
  
  1. Laboratory of Advanced Materials, School of Materials Science and Engineering, Tsinghua University, Beijing, 100084, China
  3. Key Laboratory of Integrated Exploitation of Bayan-Obo Multi-Metal Resources, Inner Mongolia University of Science & Technology, Baotou, 014010, China
  2. Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing, 100190, China
  
• 刊物类别：Physics and Astronomy
• 刊物主题：Physics
  Chinese Library of Science
  
• 出版者：Higher Education Press, co-published with Springer-Verlag GmbH
• ISSN：2095-0470

文摘

In this article, we review our recent work on quantum phase transition in two-dimensional strongly correlated fermion systems. We discuss the metal–insulator transition properties of these systems by calculating the density of states, double occupancy, and Fermi surface evolution using a combination of the cellular dynamical mean-field theory (CDMFT) and the continuous-time quantum Monte Carlo algorithm. Furthermore, we explore the magnetic properties of each state by defining magnetic order parameters. Rich phase diagrams with many intriguing quantum states, including antiferromagnetic metal, paramagnetic metal, Kondo metal, and ferromagnetic insulator, were found for the two-dimensional lattices with strongly correlated fermions. We believe that our results would lead to a better understanding of the properties of real materials.