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Extensions of numerical methods for strongly correlated electron systems.

机译:高度相关电子系统数值方法的扩展。

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摘要

This work presents extensions of the numerical methods for strongly correlated electron systems. The first part of the thesis discusses extensions and applications of the quantum cluster theories to the systems of classical spins. It is shown that such extensions can provide faster convergence through better estimation of the effects of fluctuations, yet they can also possess shortcomings which limit their application in the studies of the phase transitions. The second part of the thesis is dedicated to the numerical studies of the Hubbard model. Present Quantum Monte Carlo methods are reviewed and relationships among them are elucidated. The final part of the thesis contains the application of the developed numerical methods to investigate the phase diagram of the two-dimensional Hubbard model, especially the evidence of the Quantum Critical Point (QCP) at a finite doping. High accuracy results for thermodynamic quantities are presented in support of the existence of the QCP at a finite doping in two-dimensional Hubbard model. The relation of the QCP to the charge fluctuations is revealed and a mechanism that relates QCP to incipient phase separation is proposed.
机译:这项工作提出了高度相关的电子系统的数值方法的扩展。论文的第一部分讨论了量子簇理论在经典自旋系统中的扩展和应用。结果表明,这样的扩展可以通过更好地估计波动的影响来提供更快的收敛性,但是它们也具有缺点,限制了它们在相变研究中的应用。论文的第二部分致力于哈伯德模型的数值研究。审查了当前的量子蒙特卡洛方法,并阐明了它们之间的关系。本文的最后一部分包含了开发的数值方法的应用,以研究二维哈伯德模型的相图,特别是有限掺杂下的量子临界点(QCP)的证据。提出了热力学量的高精度结果,以支持二维Hubbard模型中有限掺杂时QCP的存在。揭示了QCP与电荷起伏的关系,并提出了将QCP与初期相分离相关的机制。

著录项

  • 作者

    Mikelsons, Karlis.;

  • 作者单位

    University of Cincinnati.;

  • 授予单位 University of Cincinnati.;
  • 学科 Condensed matter physics.;Quantum physics.
  • 学位 Ph.D.
  • 年度 2009
  • 页码 141 p.
  • 总页数 141
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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