Bogoliubov-Fermi Surfaces in Noncentrosymmetric Multicomponent Superconductors
Bogoliubov-Fermi Surfaces in Noncentrosymmetric Multicomponent Superconductors
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DOI：
10.1103/physrevlett.125.237004
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发表时间：
2020-12-02
影响因子：
8.6
通讯作者：
Herbut, Igor F.
中科院分区：
文献类型：
--
作者：
Link, Julia M.;Herbut, Igor F.
我们表明，当时间反演对称性在一个多组分超导凝聚体没有反演对称性的破缺所产生的Bogoliubov准粒子一般表现出mini-Bogoliubov-Fermi（BF）表面，小超导序参数。反演对称性的缺乏使得BF表面相对于弱扰动是稳定的。然而，随着序参数的充分增加，Bogoliubov-Fermi表面可能通过Lifshitz跃迁消失，并且这种方式的光谱变得完全带隙。我们的证明是基于对正常费米面附近的带的有效哈密顿量的计算的高能状态的积分。的规则，和实验结果进行了简要的讨论。
We show that when the time reversal symmetry is broken in a multicomponent superconducting condensate without inversion symmetry the resulting Bogoliubov quasiparticles generically exhibit mini-Bogoliubov-Fermi (BF) surfaces, for small superconducting order parameter. The absence of inversion symmetry makes the BF surfaces stable with respect to weak perturbations. With sufficient increase of the order parameter, however, the Bogoliubov-Fermi surface may disappear through a Lifshitz transition, and the spectrum this way become fully gapped. Our demonstration is based on the computation of the effective Hamiltonian for the bands near the normal Fermi surface by the integration over high-energy states. Exceptions to the rule, and experimental consequences arc briefly discussed.