论文标题
非中心超导体NBRESI的动力学和电子特性的理论研究
Theoretical study of dynamical and electronic properties of noncentrosymmetric superconductor NbReSi
论文作者
论文摘要
具有$ T_ {C} \ Simeq 6.5 $ K的非中心对称NBRESI超导体的特征是相对较大的上部临界磁场。通过实验观察到其多图形。最近的研究表明，P $ \ bar {6} $ 200M或IMA2对称性的实现。我们讨论两个对称性的动力学特性（例如，声子光谱）。在本文中，我们使用AB INDIRE技术澄清了这种歧义，并得出结论，IMA2对称性是不稳定的，应该实现P $ \ bar {6} $ 2M。在存在外部静水压力的情况下，P $ \ bar {6} $ 200M对称性也是稳定的。我们表明，带有P $ \ bar {6} $ 200M对称性的NBRESI应为（100）和（110）表面的声子表面状态。此外，我们使用稳定的对称性讨论系统的主要电子特性。
The noncentrosymmetric NbReSi superconductor with $T_{c} \simeq 6.5$ K is characterized by the relatively large upper critical magnetic field. Its multigap features were observed experimentally. Recent studies suggested realization of P$\bar{6}$2m or Ima2 symmetry. We discuss the dynamical properties of both symmetries (e.g., phonon spectra). In this paper, using the ab initio techniques, we clarify this ambiguity, and conclude that the Ima2 symmetry is unstable, and P$\bar{6}$2m should be realized. The P$\bar{6}$2m symmetry is also stable in the presence of external hydrostatic pressure. We show that NbReSi with the P$\bar{6}$2m symmetry should host phonon surface states for (100) and (110) surfaces. Additionally, we discuss the main electronic properties of the system with the stable symmetry.
