胶体系统中的反常加热
Anomalous heating in a colloidal system
摘要：
我们报告异常加热的胶体系统中，逆Mpemba效应的第一个观察，其中一个最初冷的系统升温速度比一个相同的温暖的系统耦合到同一个热浴。对于一个过阻尼，布朗胶体粒子在倾斜的双势阱中移动，我们发现一个非单调的依赖于系统的初始温度的加热时间，预测由相关的Fokker-Planck方程的本征函数展开。通过仔细调整参数，我们还观察到一个“强”版本的异常加热，其中冷系统比在稍微不同的条件下制备的系统以指数速度升温
英文摘要：
We report anomalous heating in a colloidal system, the first observation of the inverse Mpemba effect, where an initially cold system heats up faster than an identical warm system coupled to the same thermal bath. For an overdamped, Brownian colloidal particle moving in a tilted double-well potential, we find a non-monotonic dependence of the heating times on the initial temperature of the system, as predicted by an eigenfunction expansion of the associated Fokker-Planck equation. By carefully tuning parameters, we also observe a "strong" version of anomalous heating, where a cold system heats up exponentially faster than systems prepared under slightly different conditions
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