Energy localization and shape transformations in semiflexible polymer rings.
Energy localization and shape transformations in semiflexible polymer rings.
复制标题
半柔性聚合物环中的能量局部化和形状转变。
作者：
Y. Gaididei;Juan F. R. Archilla;V. Sánchez;C. Gorria
考虑了驱动分子链和阻尼分子链的形状变换。研究了空间均匀时间周期外场作用下弱耦合分子亚基闭合链。内部激励与链的弯曲自由度之间的耦合改变了链的局部弯曲刚度。在没有驱动的情况下，阵列呈圆形。当注入系统的能量超过某个临界值时，链就会经历非平衡相变：聚集体的圆形变得不稳定，链就会变成椭圆形，或者通常是多边形。激发能的分布在空间上变得不均匀：它集中在链更平坦的地方。链与平面的弱相互作用限制了链的动力学为平面流形。
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 nonequilibrium 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.