论文标题
具有超大相互作用的模型中的多体效应
Many-Body Effects in Models with Superexponential Interactions
论文作者
论文摘要
甲基化系统的特征是潜在的,即动态自由度在势力法的基础和指数中都出现。我们探讨了受甲基电位控制的多体系统的散射动力学。每个潜在的项都通过两个区域的两个鞍点表现出一个特征性的交叉,该区域限制通道到两个渐近自由运动的区域。随着通道中的散射能量的增加,我们观察到从直接反向散射行为到此通道中多个反向散射和回忆事件的过渡。我们通过探索单个多体轨迹和大型轨迹统计集合的特性来详细分析这一转变。回忆轨迹发生在鞍点以下和上方的能量,通常表现出间歇性的振荡行为,并具有强烈不同的幅度。如果统计,将反射时间分布到通道中的分布随着两平原结构到单个宽阔的不对称峰结构的增加而变化。可以通过分析相应的动量时间地图来理解这一点,从而经历了从两个值曲线到广泛分布的过渡。我们通过提供对这些不常见模型系统的未来观点的展望结束。
Superexponential systems are characterized by a potential where dynamical degrees of freedom appear in both the base and the exponent of a power law. We explore the scattering dynamics of many-body systems governed by superexponential potentials. Each potential term exhibits a characteristic crossover via two saddle points from a region with a confining channel to two regions of asymptotically free motion. With increasing scattering energy in the channel we observe a transition from a direct backscattering behaviour to multiple backscattering and recollision events in this channel. We analyze this transition in detail by exploring both the properties of individual many-body trajectories and of large statistical ensembles of trajectories. The recollision trajectories occur for energies below and above the saddle points and typically exhibit an intermittent oscillatory behaviour with strongly varying amplitudes. In case of statistical ensembles the distribution of reflection times into the channel changes with increasing energy from a two-plateau structure to a single broad asymmetric peak structure. This can be understood by analyzing the corresponding momentum-time maps which undergo a transition from a two-valued curve to a broad distribution. We close by providing an outlook onto future perspectives of these uncommon model systems.