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Quasi-two-dimensional Dirac fermions and quantum magnetoresistance in LaAgBi_2

机译:LaAgBi_2中的准二维狄拉克费米子和量子磁阻

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摘要

We report quasi-two-dimensional (2D) Dirac fermions and quantum magnetoresistance in LaAgBi_2. The band structure shows several narrow bands with nearly linear energy dispersion and Dirac-cone-like points at the Fermi level. The quantum oscillation experiments revealed one quasi-two-dimensional Fermi pocket and another complex pocket with a small cyclotron resonant mass. The in-plane transverse magnetoresistance exhibits a crossover at a critical field B~* from semiclassical weak-field B~2 dependence to the high-field unsaturated linear magnetoresistance which is attributed to the quantum limit of the Dirac fermions. Our results suggest the existence of quasi-2D Dirac fermions in rare-earth-based layered compounds with two-dimensional double-sized Bi square nets, similar to (Ca,Sr)MnBi_2, irrespective of magnetic order.
机译:我们报告准二维(2D)狄拉克费米子和LaAgBi_2中的量子磁阻。能带结构显示出几个窄带,具有几乎线性的能量色散和费米能级的狄拉克锥状点。量子振荡实验揭示了一个准二维费米腔和另一个具有较小回旋共振质量的复杂腔。平面内横向磁阻在临界场B〜*上呈现出从半经典的弱场B〜2到高场不饱和线性磁阻的交叉现象,这归因于狄拉克费米子的量子极限。我们的研究结果表明,在具有二维双尺寸Bi方形网的稀土基层状化合物中,类似于(Ca,Sr)MnBi_2的准二维Dirac费米子存在,而与磁序无关。

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