自旋分裂场激发的超导能隙无碰撞动力学
Collisionless dynamics of superconducting gap excited by spin-splitting field
AI总结：
该研究采用含时 Bogoliubov-de Gennes 理论，揭示自旋分裂场经自旋轨道耦合激发超导 Higgs 模式及诱导准粒子非绝热隧穿、干涉和动态磁化的机制。
摘要：
我们利用含时 Bogoliubov-de Gennes 理论，研究了由自旋轨道耦合介导的含时自旋分裂场与均匀超导序参量 $Δ(t)$ 之间的相干动力学相互作用。在工作的第一部分，我们表明超导体的线性响应受到 Zeeman 场和自旋翻转过程的强烈影响，从而产生超导 Higgs 模式的多个共振频率。这些模式既可以通过猝灭激发，也可以通过自旋分裂场的附加非平稳分量激发，该分量与 Higgs 模式线性耦合。在第二部分，我们分析了由不同自旋子带的谱支相交引起的准粒子态非绝热动力学，这种相交可由线性增长的 Zeeman 场诱发。我们深入阐明了序参量 $Δ(t)$ 对该场的依赖关系，以及态在避免相交点处隧穿所导致的干涉效应。我们还表明，由于非绝热隧穿与自旋翻转过程相关，准粒子气体会经历动态磁化，从而对其自旋磁化率产生贡献。
英文摘要：
We study the coherent dynamic interaction of a time-dependent spin-splitting field with the homogeneous superconducting order parameter $Δ(t)$ mediated by spin-orbit coupling using the time-dependent Bogoliubov-de Gennes theory. In the first part of the work we show that linear response of the superconductor is strongly affected by the Zeeman field and spin-flip processes, giving rise to multiple resonant frequencies of the superconducting Higgs modes. These modes can be excited either by a quench, or by an additional non-stationary component of the spin-splitting field, which couples linearly to the Higgs modes. In the second part, we analyze the nonadiabatic dynamics of quasiparticle states arising from the intersection of spectral branches from different spin subbands, which can be provoked by a linearly growing Zeeman field. We provide insights into the dependence of the order parameter $Δ(t)$ on this field and interference effects caused by tunneling of states at the avoided crossing points. We also show that since the nonadiabatic tunneling is related to spin-flip processes, the quasiparticle gas experiences a dynamic magnetization that contributes to its spin susceptibility.
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。
