论文标题
非中心多组分超导体中的Bogoliubov-Fermi表面
Bogoliubov-Fermi Surfaces in Noncentrosymmetric Multicomponent Superconductors
论文作者
论文摘要
我们表明，当时间逆转对称性在没有反转对称的多组分超导冷凝物中破裂时，所得的bogoliubov准粒子一般都会表现出Mini-Bogoliubov-Fermi（BF）表面，用于小型超导顺序参数。不存在反转对称性使BF表面相对于弱扰动而稳定。但是，随着顺序参数的足够增加，Bogoliubov-Fermi表面可能会通过LIFSHITZ过渡消失，并且这种方式的频谱变得完全掩盖。我们的演示是基于对正常费米表面附近的有效哈密顿量的计算，这是通过高能量状态的整合。简要讨论了该规则的例外和实验后果。
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 are briefly discussed.
