Quantum-Fluctuation-Enhanced Ordered Phase in Blume-Capel Model(General)

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概要

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• We consider the Blume-Capel model with quantum tunneling between the excited states. We find a magnetically ordered phase transition induced by quantum fluctuation in the model. The model has no phase transition in the corresponding classical case. Usually, quantum fluctuation breaks the ordered phase, as in the case of the transverse field Ising model. However, in the present case, an ordered phase is enhanced by a quantum fluctuation. Moreover, we find a phase transition between a quantum paramagnetic phase and a classical diamagnetic phase at a zero temperature. We study the properties of the phase transition using mean-field approximation (MFA) and a quantum Monte Carlo method to confirm the result of the MFA.

• 社団法人日本物理学会の論文
• 2005-11-15

著者

• MIYASHITA Seiji

  Department of Applied Physics, Graduate School of Engineering, The University of Tokyo

• TODOROKI Norikazu

  Institute of Physics, Kanagawa University

• Todoroki Norikazu

  Kanagawa Univ. Yokohama

• Todoroki Norikazu

  Institute Of Physics Kanagawa University

• Miyashita S

  Univ. Tokyo Tokyo Jpn

• Miyashita Seiji

  Department Of Physics University Of Tokyo

• Miyashita Seiji

  Department Of Physics School Of Science The University Of Tokyo

• Miyashita Seiji

  Graduate School Of Human And Environmental Studies Kyoto University

• Miyashita Seiji

  Department Of Applied Physics University Of Tokyo

• Miyashita Seiji

  Department Of Applied Physics Graduate School Of Engineering The University Of Tokyo

• Miyashita Seiji

  Crest Jst

• MIYASHITA Seiji

  Department of Applied Physics, University of Tokyo

• MIYASHITA Seiji

  Department of Applied Physics, School of Engineering, University of Tokyo

• MIYASHITA Seiji

  Department of Physics, School of Science, The University of Tokyo

• MIYASHITA Seiji

  Faculty of Integrated Human Studies, Kyoto University

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