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arXiv 1910.02407cond-mat.supr-con
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自旋-轨道耦合对压力诱导超导体CrAs电子性质的影响

Spin-orbit coupling effects on the electronic properties of the pressure-induced superconductor CrAs

Giuseppe Cuono, Carmine Autieri, Giuseppe Guarnaccia, Adolfo Avella, Mario Cuoco, Filomena Forte, Canio Noce

摘要:

本文研究了自旋轨道耦合对最近发现的压致超导体CrAs的低能带和费米面的影响。我们应用Löwdin向下折叠程序的紧束缚哈密顿量,其中包括内在的自旋轨道相互作用,起源于铬3d电子以及从4p的。结果表明,As的贡献可以忽略不计,而Cr的贡献对能带结构和费米面的改变主要是由于Cr的贡献。我们表明,包括自旋轨道相互作用允许选择性地去除由于晶体对称性,沿特定的高对称线的带简并。这种能带简并的释放自然决定了费米表面的重建,包括改变口袋数量的可能性。

英文摘要:

We present the effects of spin-orbit coupling on the low-energy bands and Fermi surface of the recently discovered pressure-induced superconductor CrAs. We apply the Löwdin down-folding procedure to a tight-binding hamiltonian that includes the intrinsic spin-orbit interaction, originating from the Cr 3d electrons as well as from As 4p ones. Our results indicate that As contributions have negligible effects, whereas the modifications to the band structure and the Fermi surface can be mainly ascribed to the Cr contribution. We show that the inclusion of the spin-orbit interaction allows for a selective removal of the band degeneracy due to the crystal symmetries, along specific high symmetry lines. Such release of the band degeneracy naturally determines a reconstruction of the Fermi surface, including the possibility of changing the number of pockets.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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