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Magnetic translation algebra with or without magnetic field in the continuum or on arbitrary Bravais lattices in any dimension

机译:连续体中或任意维上任意Bravais晶格上有或没有磁场的磁平移代数

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摘要

The magnetic translation algebra plays an important role in the quantum Hall effect. Murthy and Shankar, arXiv: 1207.2133, have shown how to realize this algebra using fermionic bilinears defined on a two-dimensional square lattice. We show that, in any dimension d, it is always possible to close the magnetic translation algebra using fermionic bilinears, whether in the continuum or on the lattice. We also show that these generators are complete in even, but not odd, dimensions, in the sense that any fermionic Hamiltonian in even dimensions that conserves particle number can be represented in terms of the generators of this algebra, whether or not time-reversal symmetry is broken. As an example, we reproduce the f-sum rule of interacting electrons at vanishing magnetic field using this representation. We also show that interactions can significantly change the bare bandwidth of lattice Hamiltonians when represented in terms of the generators of the magnetic translation algebra.
机译:磁平移代数在量子霍尔效应中起着重要作用。 Murthy和Shankar(arXiv:1207.2133)展示了如何使用在二维方格上定义的费米双线性实现该代数。我们证明,在任何维数d中,无论是在连续体中还是在晶格上,始终都可以使用铁离子双线性来关闭磁平移代数。我们还表明,这些生成器在偶数但不是奇数维上是完整的,在某种意义上,任何守恒尺寸的费米子哈密顿量都可以用该代数的生成器来表示,无论时间反转对称性如何被打破。例如,我们使用此表示来再现在消失的磁场中相互作用的电子的f-sum规则。我们还表明,以磁平移代数的生成器表示时,相互作用可以显着改变晶格哈密顿量的裸带宽。

著录项

  • 来源
    《Physical review》 |2012年第19期|195125.1-195125.10|共10页
  • 作者单位

    Physics Department, Boston University, Boston, Massachusetts 02215, USA;

    Condensed Matter Theory Group, Paul Scherrer Institute, CH-5232 Villigen PSI, Switzerland;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    theory and modeling;

    机译:理论与建模;

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