Light-induced collective pseudospin precession resonating with Higgs mode in a superconductor
Light-induced collective pseudospin precession resonating with Higgs mode in a superconductor
复制标题
DOI：
10.1126/science.1254697
复制
发表时间：
2014-09-05
期刊：
影响因子：
56.9
通讯作者：
Shimano, Ryo
中科院分区：
文献类型：
--
作者：
Matsunaga, Ryusuke;Tsuji, Naoto;Shimano, Ryo
超导体拥有可以用光操纵的集体模式。我们证明了强太赫兹光场可以诱导NbN中超导序参量振荡，振荡频率是太赫兹场的两倍。结果可以被捕获为交流驱动场中安德森伪自旋的集体进动。场和超导体的希格斯幅值之间的共振会产生大太赫兹的三次谐波。本文提出的方法为研究超导体中的非线性量子光学铺平了道路，并有可能扩展到奇异超导体中，以揭示有序参数的特征及其与其他自由度的耦合。
Superconductors host collective modes that can be manipulated with light. We show that a strong terahertz light field can induce oscillations of the superconducting order parameter in NbN with twice the frequency of the terahertz field. The result can be captured as a collective precession of Anderson's pseudospins in ac driving fields. A resonance between the field and the Higgs amplitudemode of the superconductor then results in large terahertz third-harmonic generation. The method we present here paves a way toward nonlinear quantum optics in superconductors with driving the pseudospins collectively and can be potentially extended to exotic superconductors for shedding light on the character of order parameters and their coupling to other degrees of freedom.