Anomalous magnetic transport and extra quantum oscillation in semi-metallic photon-like fermion gas

Anomalous magnetic transport and extra quantum oscillation in semi-metallic photon-like fermion gas
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半金属类光子费米子气体中的反常磁输运和额外量子振荡

DOI:
10.1088/1367-2630/aad9b7
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发表时间:
2018-08
影响因子:
3.3
通讯作者:
Yue Yu
Yue Yu
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Xi Luo;Fei-Ye Li;Yue Yu

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在不存在洛伦兹对称性的情况下,凝聚态系统中可以出现具有线性色散和精确平坦能带的Weyl费米子(费米子)的赝旋-1对应态。费奥子的平带分支等价于麦克斯韦理论中的纵向光子,由于浮现(费米子)规范对称性,纵向光子是一个多余的自由度。当耦合到外加磁场时,费米子规范对称性被破坏,平带费子成为以朗道能级指数(n>1)为特征的无间隙激发。在长波长范围内,这些无隙模式与手征反常相关的零朗道能级具有相反的手性,这导致了更丰富的磁输运性质。为了进一步探索这些无隙模式的新性质,我们通过一个推广的Lieb晶格模型研究了量子振荡。我们发现了一种额外的振荡行为,这表明这些奇异的无间隙模的存在。我们从文献中收集了已知的从头计算数据,并讨论了在真实材料中实现半金属费奥子气体的可能性。
In the absence of Lorentz symmetry, the pseudospin-1 counterpart of the Weyl fermion (feroton) with linear dispersions and an exact flat band can emerge in condensed matter systems. The flat band branch of the feroton is equivalent to the longitudinal photon in Maxwell theory, which is a redundant degree of freedom due to the emergent (fermionic) gauge symmetry. Upon coupling to an external magnetic field, the fermionic gauge symmetry is broken and the flat band ferotons become gapless excitations characterized by Landau level indices (n > 1). In the long wavelength limit, these gapless modes are of the opposite chirality to the chiral anomaly related zero Landau level, which leads to much more plentiful magnetic transport properties. To further explore the novel properties of these gapless modes, we investigate the quantum oscillation through a generalized Lieb lattice model. We find an extra oscillating behavior which indicates the existence of these exotic gapless modes. We collect known ab initio calculation data from the literature and discuss the possibility of realizing the semi-metallic feroton gas in real materials.
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