论文标题
活性液晶中活性诱导的各向同性偏置过渡
Activity induced isotropic-polar transition in active liquid crystals
论文作者
论文摘要
由于活性成分的内部能量注射，活性流体是本质上不平衡的系统。我们在这里表明，从无运动的极性态向流动的极性状态的过渡可能会通过唯一的主动注入来驱动，而在没有临时自由能的情况下极有利于有序阶段的发展，极性流动力相互作用的作用可能会驱动。特别是，我们提出了一个分析论点，并执行了晶格玻尔兹曼模拟，其中在过渡点观察到系统极性分数中大的时间波动的出现。此外，我们利用比例到规模的分析来揭示能量传递机制，证明弹性吸收在系统的整体动力学中起着相关的作用，与以前在通常的活动凝胶理论上所报道的术语中所报告的相反，该术语实际上可以忽略了该术语。
Active fluids are intrinsically out-of-equilibrium systems due to the internal energy injection of the active constituents. We show here that a transition from a motion-less isotropic state towards a flowing polar one can be possibly driven by the sole active injection through the action of polar-hydrodynamic interactions in absence of an ad hoc free-energy which favors the development of an ordered phase. In particular, we propose an analytical argument and we perform lattice Boltzmann simulations where the appearance of large temporal fluctuations in the polar fraction of the system is observed at the transition point. Moreover, we make use of a scale-to-scale analysis to unveil the energy transfer mechanism, proving that elastic absorption plays a relevant role in the overall dynamics of the system, contrary to what reported in previous works on the usual active gel theory where this term could be factually neglected.
