论文标题
等热活动物质引擎的效率：强驾驶节拍较弱的驾驶
Efficiency of isothermal active matter engines: Strong driving beats weak driving
论文作者
论文摘要
我们研究使用单个活性粒子作为其“工作介质”的显微镜发动机。即使在恒定温度下，也可以作为工作来恢复驱动粒子的有向运动所需的部分能量。可以通过示意性地考虑到定向运动的化学自由度，而无需解决精确的显微镜机制，可以通过示意性地考虑宽阔的合成活性颗粒。我们得出了准静态热力学效率的分析结果，即可以回收为机械工作的可用化学能的比例。尽管对于胶体颗粒而言，这种效率却很小，但随着耗散的增加，它会增加，而不是线性响应制度，并且在较大的推进速度下的最大值。我们的结果表明，超越线性响应制度的行驶对活动发动机的效率产生了非平凡的后果。
We study microscopic engines that use a single active particle as their "working medium". Part of the energy required to drive the directed motion of the particle can be recovered as work, even at constant temperature. A wide class of synthetic active particles can be captured by schematically accounting for the chemical degrees of freedom that power the directed motion without having to resolve the exact microscopic mechanism. We derive analytical results for the quasi-static thermodynamic efficiency, i.e., the fraction of available chemical energy that can be recovered as mechanical work. While this efficiency is vanishingly small for colloidal particles, it increases as the dissipation is increased beyond the linear response regime and goes through a maximum at large propulsion speeds. Our results demonstrate that driving beyond the linear response regime has non-trivial consequences for the efficiency of active engines.
