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arXiv 2007.00963cond-mat.mtrl-sci
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单轴应力对NbP电子能带结构的影响

Effect of uniaxial stress on the electronic band structure of NbP

Clemens Schindler, Jonathan Noky, Marcus Schmidt, Claudia Felser, Jochen Wosnitza, Johannes Gooth

摘要:

外尔半金属NbP具有由两个电子和两个空穴袋组成的非常小的费米表面,其在$k$空间中的四重简并与下面的四元晶格的旋转对称性有关。通过施加单轴应力,晶体的对称性可以降低,这相继导致费米面口袋的简并提升。当磁场沿着四元晶格的$c$轴排列时,这通过Shubnikov-de Haas频率的分裂来反映。在这项研究中,我们提出了测量的Shubnikov-de Haas振荡的单轴拉伸下的单晶NbP样品,结合国家的最先进的计算的电子能带结构。我们的研究结果表明,计算和实验确定的Shubnikov-de Haas频率之间的定性协议,表明引入应变后的带结构计算的鲁棒性。此外,我们预测随着单轴张力的增加,外尔点的显著移位,允许沿$a$轴仅在0.8%的应变下有效地调谐到费米能级。

英文摘要:

The Weyl semimetal NbP exhibits a very small Fermi surface consisting of two electron and two hole pockets, whose fourfold degeneracy in $k$ space is tied to the rotational symmetry of the underlying tetragonal crystal lattice. By applying uniaxial stress, the crystal symmetry can be reduced, which successively leads to a degeneracy lifting of the Fermi-surface pockets. This is reflected by a splitting of the Shubnikov-de Haas frequencies when the magnetic field is aligned along the $c$ axis of the tetragonal lattice. In this study, we present the measurement of Shubnikov-de Haas oscillations of single-crystalline NbP samples under uniaxial tension, combined with state-of-the-art calculations of the electronic band structure. Our results show qualitative agreement between calculated and experimentally determined Shubnikov-de Haas frequencies, demonstrating the robustness of the band-structure calculations upon introducing strain. Furthermore, we predict a significant shift of the Weyl points with increasing uniaxial tension, allowing for an effective tuning to the Fermi level at only 0.8% of strain along the $a$ axis.

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