论文标题
流体粘弹性触发双井粒子的快速转变
Fluid viscoelasticity triggers fast transitions of a Brownian particle in a double well optical potential
论文作者
论文摘要
热活化的过渡本质上是普遍存在的，发生在通常被认为是理想粘性流体的复杂环境中。我们报告了在粘弹性流体中具有单个长松弛时间的井眼中的孔之间的首次直接观察。我们精确地表征了电势和流体，从而可以在我们的实验结果与基于广义Langevin方程的理论模型之间进行整洁的比较。我们的发现表明，与牛顿流体中的流体相比，过渡速率大大扩增，这是由于粒子交叉事件中流体的松弛而引起的。
Thermally activated transitions are ubiquitous in nature, occurring in complex environments which are typically conceived as ideal viscous fluids. We report the first direct observations of a Brownian bead transiting between the wells of a bistable optical potential in a viscoelastic fluid with a single long relaxation time. We precisely characterize both the potential and the fluid, thus enabling a neat comparison between our experimental results and a theoretical model based on the generalized Langevin equation. Our findings reveal a drastic amplification of the transition rates compared to those in a Newtonian fluid, stemming from the relaxation of the fluid during the particle crossing events.
