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Instability of Dirac semimetal phase under a strong magnetic field

机译：强磁场下狄拉克半金属相的不稳定性

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摘要

The quantum limit can be easily reached in Dirac semimetals under a magnetic field, which leads to some exotic many-body physics due to the high degeneracy of the topological zeroth Landau bands. By solving the effective Hamiltonian, which is derived by tracing out the high-energy degrees of freedom, at the self-consistent mean-field level, we have systematically studied the instability of Dirac semimetals under a strong magnetic field. A charge-density wave (CDW) phase and a polarized nematic phase formed by "exciton condensation" are predicted as the ground state for the tilted and untilted bands, respectively. Furthermore, we propose that, as distinguished from the CDW phase, the nematic phase can be identified in experiments by anisotropic transport and Raman scattering.
机译：狄拉克半金属在磁场下很容易达到量子极限，这归因于拓扑第零朗道带的高简并性，从而导致了一些奇异的多体物理学。通过求解通过追踪高能自由度在自洽平均场水平上得出的有效哈密顿量，我们系统地研究了强磁场下狄拉克半金属的不稳定性。预测通过“激子凝聚”形成的电荷密度波（CDW）相和极化向列相分别作为倾斜带和倾斜带的基态。此外，我们建议，不同于CDW相，向列相可以在实验中通过各向异性传输和拉曼散射确定。

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  • 来源
    《Physical review》 |2017年第23期|235104.1-235104.7|共7页
  • 作者

    Zhida Song; Zhong Fang; Xi Dai;

  • 作者单位

    Beijing National Laboratory for Condensed Matter Physics and Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China,University of Chinese Academy of Sciences, Beijing 100049, China;

    Beijing National Laboratory for Condensed Matter Physics and Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China,Collaborative Innovation Center of Quantum Matter, Beijing 100084, China;

    Beijing National Laboratory for Condensed Matter Physics and Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China,Collaborative Innovation Center of Quantum Matter, Beijing 100084, China;

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