Moving smectic phase and transverse mode locking in driven vortex matter
Moving smectic phase and transverse mode locking in driven vortex matter
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DOI：
10.1103/physrevresearch.4.033085
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发表时间：
2022-07-29
影响因子：
4.2
通讯作者：
Okuma, S.
中科院分区：
文献类型：
--
作者：
Maegochi, S.;Ienaga, K.;Okuma, S.
非平衡系统表现出具有不同有序度的各种动态相。具有横向周期性的运动近晶相是有序态之一，理论上被认为是二维驱动系统的普遍现象。然而，由于缺乏合适的实验方法，还没有得到包括移动近晶相在内的全面的动态相图。在这里，我们研究了驱动涡旋物质在非晶MoxGe（1-x）薄膜的动态相位通过使用两步测量响应于相互垂直的驱动电流的瞬态电压。我们发现从塑性流动到各向异性近晶流动和从各向异性近晶流动到各向同性移动布拉格玻璃作为电流的函数的动态排序。移动近晶相的令人信服的证据是从第一个横向锁模（ML）的信号大于纵向ML，表明更高的横向阶比纵向的。本文提出的横向最大似然法可用于检测驱动介质中的各向异性周期性。
Out-of-equilibrium systems exhibit various dynamic phases with different degrees of order. A moving smectic phase with transverse periodicity is one of the ordered states, which is theoretically expected to be generic to driven two-dimensional systems. However, a comprehensive dynamic phase diagram, including the moving smectic phase, has not been obtained because of lack of suitable experimental methods. Here we study dynamic phases of driven vortex matter in an amorphous MoxGe(1-x) film by using two-step measurements of transient voltage in response to mutually perpendicular driving currents. We find dynamic orderings from the plastic flow to the anisotropic smectic flow and from the anisotropic smectic flow to the isotropic moving Bragg glass as a function of the current. Convincing evidence of the moving smectic phase is obtained from the first transverse mode locking (ML) with signals larger than those of longitudinal ML, indicating the higher transverse order than the longitudinal one. Transverse ML developed here is useful to detect the anisotropic periodicity in driven media.