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Influence of Landau levels on the phonon dispersion of Weyl semimetals

机译:Landau水平对Weyl Semimetals的声音分散的影响

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摘要

Weyl semimetals display unusual electronic transport properties when placed under magnetic fields. Here, we investigate how magnetic fields alter the dynamics of long-wavelength lattice vibrations in these materials. To that end, we develop a theory for the phonon dispersion, which incorporates contributions from chiral and nonchiral Landau levels, electron-phonon interactions, electron-electron interactions, and disorder. We predict (i) a magnetic-field-induced hybridization between optical phonons and plasmons, (ii) avoided crossings between pseudoscalar optical phonons and electronic excitations originating from nonchiral Landau levels, and (iii) a sharp dependence of the sound velocity on the relative angle between the sound propagation and the magnetic field. We compare our results to recent theoretical studies on the signatures of the chiral anomaly in phonon dynamics.
机译:Weyl Semimetals在放置在磁场下时显示出异常的电子传输属性。在这里,我们研究了磁场如何改变这些材料中的长波长晶格振动的动态。为此,我们开发了对声子分散理论的理论,其中包括手性和非海拔地兰水平,电子 - 声子相互作用,电子 - 电子相互作用和病症的贡献。我们预测(i)光学声音和等离子体之间的磁场诱导的杂交,(ii)避免了伪影片光学声子和源自非海胆Landau水平的电子激发之间的交叉,(iii)对相对速度的声速敏锐依赖性声音传播与磁场之间的角度。我们将结果与最近关于声子动力学的手性异常签名的理论研究。

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  • 来源
    《Physical review》 |2019年第14期|144301.1-144301.20|共20页
  • 作者单位

    Univ Sherbrooke Dept Phys Inst Quant Sherbrooke PQ J1K 2R1 Canada|Univ Sherbrooke Regrp Quebecois Mat Pointe Sherbrooke PQ J1K 2R1 Canada;

    Univ Sherbrooke Dept Phys Inst Quant Sherbrooke PQ J1K 2R1 Canada|Univ Sherbrooke Regrp Quebecois Mat Pointe Sherbrooke PQ J1K 2R1 Canada|Univ British Columbia Dept Phys Vancouver BC V6T 1Z1 Canada|Univ British Columbia Stewart Blusson Inst Quantum Matter Vancouver BC V6T 1Z1 Canada;

    Univ Sherbrooke Dept Phys Inst Quant Sherbrooke PQ J1K 2R1 Canada|Univ Sherbrooke Regrp Quebecois Mat Pointe Sherbrooke PQ J1K 2R1 Canada;

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