论文标题
一维周期基板上二维尘土等离子体的连续和不连续的过渡
Continuous and Discontinuous Transitions in the Depinning of Two-Dimensional Dusty Plasmas on a One-Dimensional Periodic Substrate
论文作者
论文摘要
进行Langevin动力学模拟，以研究一维周期底物上二维灰尘等离子体的含量动力学。从六倍协调粒子的诊断$ p_6 $和集体漂移速度$ v_x $，出现三种不同的状态，它们是固定，无序的塑料流量和移动有序状态。发现基板的深度能够根据$ p_6 $和$ v_x $的结果调节默认相位过渡的属性，以及观察$ v_x $的滞后，同时单调地增加并减少驱动力。当底物的深度浅时，有两个连续的相变。当潜在的孔深度略微增加时，从固定到无序塑料流量状态的相变是连续的。但是，从无序的塑料流到移动有序状态的相变是不连续的。当底物更深时，从固定到无序塑料流量状态的相变为不连续的。当底物进一步增加时，随着驱动力的增加，固定的状态会直接改变对移动有序状态的变化，从而使无序的塑性流量状态完全消失。
Langevin dynamical simulations are performed to study the depinning dynamics of two-dimensional dusty plasmas on a one-dimensional periodic substrate. From the diagnostics of the sixfold coordinated particles $P_6$ and the collective drift velocity $V_x$, three different states appear, which are the pinning, disordered plastic flow, and moving ordered states. It is found that the depth of the substrate is able to modulate the properties of the depinning phase transition, based on the results of $P_6$ and $V_x$, as well as the observation of hysteresis of $V_x$ while increasing and decreasing the driving force monotonically. When the depth of the substrate is shallow, there are two continuous phase transitions. When the potential well depth slightly increases, the phase transition from the pinned to the disordered plastic flow states is continuous; however, the phase transition from the disordered plastic flow to the moving ordered states is discontinuous. When the substrate is even deeper, the phase transition from the pinned to the disordered plastic flow states changes to discontinuous. When the substrate further increases, as the driving force increases, the pinned state changes to the moving ordered state directly, so that the disordered plastic flow state disappears completely.
