We study the efficiency fluctuations of a stochastic heat engine made of $N$ interacting unicyclic machines and undergoing a phase transition in the macroscopic limit. Depending on $N$ and on the observation time, the machine can explore its whole phase space or not. This affects the engine efficiency that either strongly fluctuates on a large interval of equiprobable efficiencies (ergodic case) or fluctuates close to several most likely values (nonergodic case). We also provide a proof that despite the phase transition, the decay rate of the efficiency distribution at the reversible efficiency remains largest one although other efficiencies can now decay equally fast.

中文翻译：

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经历相变的随机电机的效率波动。

我们研究了由以下材料制成的随机热机的效率波动 $ñ$相互作用的单环机器并在宏观极限内经历相变。取决于$ñ$根据观测时间，机器可以探索整个相位空间与否。这会影响发动机效率，发动机效率会在相当大的等概率效率区间内剧烈波动（遍历情况）或接近几个最可能的值波动（非遍历情况）。我们还提供了一个证明，尽管发生了相变，但可逆效率下效率分布的衰减率仍然最大，尽管其他效率现在可以同样快地衰减。