中国物理B ›› 2008, Vol. 17 ›› Issue (5): 1623-1628.doi: 10.1088/1674-1056/17/5/016

• GENERAL • 上一篇    下一篇

Quantum phase transition and von Neumann entropy of quasiperiodic Hubbard chains

朱 璇, 童培庆   

  1. Department of Physics, Nanjing Normal University, Nanjing 210097, China
  • 收稿日期:2007-11-20 修回日期:2007-12-24 出版日期:2008-05-20 发布日期:2008-05-20
  • 基金资助:
    Project supported by the National Natural Science Foundation of China (Grant Nos 90203009, 10175035 and 10674072), the Specialized Research Fund for the Doctoral Programme (SRFDP) of Higher Education of China (Grant No 20060319007), and the Foundation for

Quantum phase transition and von Neumann entropy of quasiperiodic Hubbard chains

Zhu Xuan(朱璇) and Tong Pei-Qing(童培庆)†   

  1. Department of Physics, Nanjing Normal University, Nanjing 210097, China
  • Received:2007-11-20 Revised:2007-12-24 Online:2008-05-20 Published:2008-05-20
  • Supported by:
    Project supported by the National Natural Science Foundation of China (Grant Nos 90203009, 10175035 and 10674072), the Specialized Research Fund for the Doctoral Programme (SRFDP) of Higher Education of China (Grant No 20060319007), and the Foundation for

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摘要： The half-filled Hubbard chains with the Fibonacci and Harper modulating site potentials are studied in a self-consistent mean-field approximation. A new order parameter is introduced to describe a charge density order. We also calculate the von Neumann entropy of the ground state. The results show that the von Neumann entropy can identify a CDW/SDW (charge density wave/spin density wave) transition for quasiperiodic models.

Abstract: The half-filled Hubbard chains with the Fibonacci and Harper modulating site potentials are studied in a self-consistent mean-field approximation. A new order parameter is introduced to describe a charge density order. We also calculate the von Neumann entropy of the ground state. The results show that the von Neumann entropy can identify a CDW/SDW (charge density wave/spin density wave) transition for quasiperiodic models.

Key words: von Neumann entropy, quasiperiodicity, Hubbard model, spin-density waves

中图分类号:  (Lattice fermion models (Hubbard model, etc.))

  • 71.10.Fd
71.45.Lr (Charge-density-wave systems) 75.10.Lp (Band and itinerant models) 75.30.Fv (Spin-density waves)