半柔性聚合物环中的能量局域化和形状变换
Energy localization and shape transformations in semiflexible polymer rings
摘要：
考虑了驱动和阻尼分子链中的形状变换。研究了空间均匀时间周期外场作用下弱耦合分子亚基的闭合链。链的内部激励和弯曲自由度之间的耦合修改链的局部弯曲刚度。在没有驱动的情况下，阵列采用圆形形状。当泵入系统的能量超过某个临界值时，链发生非平衡相变：聚集体的圆形形状变得不稳定，链呈椭圆形，或者通常呈多边形。激发能分布在空间上变得不均匀：它局限于链更平坦的地方。链与平面的弱相互作用将动力学限制在平面流形上
英文摘要：
Shape transformations in driven and damped molecular chains are considered. Closed chains of weakly coupled molecular subunits under the action of spatially homogeneous time-periodic external field are studied. The coupling between the internal excitations and the bending degrees of freedom of the chain modifies the local bending rigidity of the chain. In the absence of driving the array takes a circular shape. When the energy pumped into the system exceeds some critical value the chain undergoes a non-equilibrium phase transition: the circular shape of the aggregate becomes unstable and the chain takes the shape of an ellipse or, in general, of a polygon. The excitation energy distribution becomes spatially nonuniform: it localizes in such places where the chain is more flat. The weak interaction of the chain with a flat surface restricts the dynamics to a flat manifold
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