论文标题
在分层铜层中的非线性Terahertz驾驶等离子体波
Non-linear Terahertz Driving of Plasma Waves in Layered Cuprates
论文作者
论文摘要
超导性的标志是电子量子阶段的刚度，负责超氟行为和迈斯纳效应。相位刚度的强度是由约瑟夫森耦合设定的，约瑟夫森耦合在分层的超导酸奶油中强烈各向异性。到目前为止，THZ的光脉冲已有效地用于实现非线性对照Josephson等离子体模式，其频率尺度位于THZ范围内。但是，已经假定高能内部等离子体模式对THZ泵送不敏感。在这里，我们表明，通过一般的两样式激发机制，可以驱动低频和高频等离子体波。约瑟夫森耦合的各向异性导致平面外和面内响应之间的热效应明显差异，这与实验一致。我们的结果将观察到的平面THZ非线性驾驶的存活率高于$ t_c $，以增强库酸酯相位刚度的波动效应，从而铺平了对非常规超导体中相位刚性的冲动控制。
The hallmark of superconductivity is the rigidity of the quantum-mechanical phase of electrons, responsible for superfluid behavior and Meissner effect. The strength of the phase stiffness is set by the Josephson coupling, which is strongly anisotropic in layered superconducting cuprates. So far, THz light pulses have been efficiently used to achieve non-linear control of the out-of-plane Josephson plasma mode, whose frequency scale lies in the THz range. However, the high-energy in-plane plasma mode has been assumed to be insensitive to THz pumping. Here, we show that THz driving of both low-frequency and high-frequency plasma waves is possible via a general two-plasmon excitation mechanism. The anisotropy of the Josephson couplings leads to marked differences in the thermal effects among the out-of-plane and in-plane response, consistently with the experiments. Our results link the observed survival of the in-plane THz non-linear driving above $T_c$ to enhanced fluctuating effects in the phase stiffness in cuprates, paving the way to THz impulsive control of phase rigidity in unconventional superconductors.
