Entropy Scaling Laws in Self Propelled Glass Formers

Here we probe a glass forming liquid composed of self-
propelled “active” particles and show that increasing the duration of self-propulsion
makes the pair excess entropy negatively larger. The associated reduction in
the number of accessible configurations per particle leads to a reduction in self-
diffusivity. At moderate supercooling, the self-diffusivity is Arrhenius and in
a reduced form obeys a Dzugutov like scaling law, directly yielding us a pair
excess entropy that is inversely proportional to the effective temperature. In
the strongly super-cooled regime, Dzugutov law does not apply and we observe
that, the pair excess entropy shows a non-Arrhenius (power law) dependence on
the effective temperature with an exponent that depends on the self propulsion
time of the active particles.

本研究针对由自驱动‘活性’粒子（self-propelled active particles）构成的玻璃形成液体（glass forming liquid）展开探究，结果表明：提升自驱动时长会使双体过剩熵（pair excess entropy）的负值进一步增大。由此带来的单粒子可及构型数目减少，会导致自扩散系数（self-diffusivity）降低。在中等过冷条件下，自扩散系数符合阿伦尼乌斯（Arrhenius）行为，且以约化形式满足类朱古托夫（Dzugutov）标度律，由此可直接推导出与有效温度（effective temperature）成反比的双体过剩熵。在强过冷区域，朱古托夫标度律不再适用，此时我们观测到双体过剩熵与有效温度呈非阿伦尼乌斯（幂律（power law））依赖关系，其幂指数取决于活性粒子的自驱动时长。