论文标题
具有有限动量对的超导体中的动力磁反应
Dynamical magnetic response in superconductors with finite momentum pairs
论文作者
论文摘要
我们在具有反转对称性的超导体的FULDE-FERRELL（FF）状态中得出了动力学磁反应函数。通过最小化冷凝能和结果的准粒子状态和光谱函数来获得配对动量2q，由于有限的Q，频谱函数表现为成对的和未配对的区域。然后，在FF状态下以线性响应形式主义计算动态磁敏感性，由S波或D波配对产生的有限Q冷凝物。我们表明内部以及配对和未配对段之间的准粒子激发有助于动态响应。我们讨论了其对频率和动量转移的依赖性，该频率和动量转移会形成与Q平行的特征对称性破坏。此外，我们研究了对骑士移位的可能影响，对于D波配对对FF状态的自旋共振形成的情况。
We derive the dynamical magnetic response functions in the Fulde-Ferrell (FF) state of a superconductor with inversion symmetry. The pair momentum 2q is obtained by minimization of the condensation energy and the resulting quasiparticle states and spectral functions exhibit the segmentation into paired and unpaired regions due to the finite q. The dynamical magnetic susceptibility is then calculated in linear response formalism in the FF state with finite-q condensate resulting from s-wave or d-wave pairing. We show that quasiparticle excitations inside as well as between paired and unpaired segments contribute to the dynamical response. We discuss its dependence on frequency and momentum transfer which develops a characteristic symmetry-breaking parallel to q. Furthermore, we investigate the possible influence on Knight shift and in the case of d-wave pairing on the spin resonance formation in the FF state.
