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Quantum phase transition and von Neumann entropy of quasiperiodic Hubbard chains

ISSN号：1674-1056
期刊名称：《中国物理B：英文版》
时间：0
分类：O413[理学—理论物理;理学—物理]
作者机构：[1]Department of Physics, Nanjing Normal University, Nanjing 210097, China
相关基金：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 outstanding Young Teacher of Ministry of Education of China.

关键词：量子论, 相变, 准周期模型, 熵, 哈伯德模型, 自旋密度波, von Neumann entropy, quasiperiodicity, Hubbard model, spin-density waves

中文摘要：

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.

英文摘要：

The half-filled Hubbard chains with the Fibonacci and Harper modulating site potentials are studied in a selfconsistent 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.

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