标题： 通过相干声子探测多轨道超导体中的超导性和配对对称性 显示英文标题

标题： Probing superconductivity and pairing symmetry by coherent phonons in multiorbital superconductors

摘要： 我们证明，在多轨道超导体中由激光脉冲产生的相干声子振荡中的相位信息可以作为实验工具，用于探测超导性和配对对称性。 正常态和超导态之间的相位差在超导转变温度Tc以下与超导序参量成正比。 对于具有不同配对对称性的超导态，它也表现出不同的行为。 特别是，如果存在轨道依赖的内部符号变化态，那么在Tc以下相位差可能会出现不连续的跳跃。 显示英文摘要

摘要： We show that the phase information contained in coherent phonon oscillations generated by a laser pulse in a multi- orbital superconductor can be used as an experimental tool to probe super- conductivity and pairing symmetries. The phase difference between the normal and superconducting states is proportional to the superconducting order parameter just below the superconducting transition temperature, Tc. It also exhibits different behaviors for superconducting states with different pairing symmetries. In particular, if there is an orbital-dependent internal sign change state, the phase difference can have a discontinuous jump below Tc.