Universality for moving stripes: a hydrodynamic theory of polar active smectics.
Universality for moving stripes: a hydrodynamic theory of polar active smectics.
复制标题
DOI：
10.1103/physrevlett.111.088701
复制
发表时间：
2013-01
影响因子：
8.6
通讯作者：
Leiming Chen;J. Toner
中科院分区：
文献类型：
--
作者：
Leiming Chen;J. Toner
我们提出了一种移动条纹理论(“极活性近晶子”)，它既有数守恒，也有无数守恒。后者用紧凑各向异性的Kardar-Parisi-Zhang方程描述，这意味着近晶有序在d=2范围内是准长的，在d=3范围内是长程的。在d=2时，近晶无序通过Kosterlitz-Thouless相变来描述，这可以通过增加噪声或改变某些非线性来驱动。在数守恒的情况下，d=3的近晶级对巨数涨落有很大的抑制作用，d=2时，非线性效应变得重要。
We present a theory of moving stripes ("polar active smectics"), both with and without number conservation. The latter is described by a compact anisotropic Kardar-Parisi-Zhang equation, which implies smectic order is quasilong ranged in d=2 and long ranged in d=3. In d=2 the smectic disorders via a Kosterlitz-Thouless transition, which can be driven by either increasing the noise or varying certain nonlinearities. For the number-conserving case, giant number fluctuations are greatly suppressed by the smectic order, which is long ranged in d=3. Nonlinear effects become important in d=2.