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Tunable interactions and phase transitions in Dirac materials in a magnetic field

机译:狄拉克材料在磁场中的可调谐相互作用和相变

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摘要

A partially filled Landau level (LL) hosts a variety of correlated states of matter with unique properties. The ability to control these phases requires tuning the effective electron interactions within a LL, which has been difficult to achieve in GaAs-based structures. Here we consider a class of Dirac materials in which the chiral band structure, along with the mass term, gives rise to a wide tunability of the effective interactions by the magnetic field. This tunability is such that different phases can occur in a single LL, and phase transitions between them can be driven in situ. The incompressible, Abelian and non-Abelian, liquids are stabilized in interaction regimes different from GaAs. Our study points to a realistic method of controlling the correlated phases and studying the phase transitions between them in materials such as graphene, bilayer graphene, and topological insulators.
机译:局部填充的朗道能级(LL)承载着各种具有独特属性的关联状态。控制这些相的能力需要调整LL内的有效电子相互作用,这在基于GaAs的结构中很难实现。在这里,我们考虑一类狄拉克材料,其中手性能带结构以及质量项导致磁场有效相互作用的广泛可调性。这种可调性使得单个LL中可以出现不同的相位,并且可以在原位驱动它们之间的相变。不可压缩的Abelian和非Abelian液体在不同于GaAs的相互作用体系中稳定。我们的研究指出了一种控制相关相并研究诸如石墨烯,双层石墨烯和拓扑绝缘体等材料中它们之间的相变的现实方法。

著录项

  • 来源
    《Physical review》 |2011年第24期|p.241306.1-241306.4|共4页
  • 作者单位

    Department of Electrical Engineering, Princeton University, Princeton, New Jersey 08544, USA;

    Princeton Center for Theoretical Science, Princeton University, Princeton, New Jersey 08544, USA,Department of Physics, Harvard Univeristy, Cambridge, Massachusetts 02138, USA;

    National High Magnetic Field Laboratory and Department of Physics, Florida State University, Florida 32306, USA;

    Department of Electrical Engineering, Princeton University, Princeton, New Jersey 08544, USA,Princeton Center for Theoretical Science, Princeton University, Princeton, New Jersey 08544, USA;

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

    quantum hall effects;

    机译:量子霍尔效应;

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