Tjhung Elsen, Berthier Ludovic
Laboratoire Charles Coulomb, UMR 5221, CNRS and Université Montpellier, Montpellier 34095, France.
Phys Rev Lett. 2015 Apr 10;114(14):148301. doi: 10.1103/PhysRevLett.114.148301. Epub 2015 Apr 8.
The emergence of particle irreversibility in periodically driven colloidal suspensions has been interpreted as resulting either from a nonequilibrium phase transition to an absorbing state or from the chaotic nature of particle trajectories. Using a simple model of a driven suspension, we show that a nonequilibrium phase transition is accompanied by hyperuniform static density fluctuations in the vicinity of the transition, where we also observe strong dynamic heterogeneities reminiscent of dynamics in glassy materials. We find that single particle dynamics becomes intermittent and strongly non-Fickian, and that collective dynamics becomes spatially correlated over diverging length scales. Our results suggest that the two theoretical scenarii can be experimentally discriminated using particle-resolved measurements of standard static and dynamic observables.
在周期性驱动的胶体悬浮液中，粒子不可逆性的出现被解释为要么源于向吸收态的非平衡相变，要么源于粒子轨迹的混沌性质。通过使用一个简单的驱动悬浮液模型，我们表明非平衡相变伴随着相变附近的超均匀静态密度涨落，在那里我们还观察到类似于玻璃态材料动力学的强烈动态不均匀性。我们发现单粒子动力学变得间歇性且强烈非菲克，并且集体动力学在发散的长度尺度上变得空间相关。我们的结果表明，可以使用标准静态和动态可观测量的粒子分辨测量在实验上区分这两种理论情形。
