论文标题
耗散系统中的无耗散模式
Dissipation-free modes in dissipative systems
论文作者
论文摘要
系统及其环境（或浴室）之间的耦合总是会导致耗散。但是，我们表明，如果两个子系统之间共享浴缸，则由两个子系统组成的系统可以具有无耗散模式。反向阅读，共享的浴缸并不会导致所有模式的耗散。作为一个关键示例，我们考虑了两个共同的防fiferromagnet的简单模型，其中环境是由两个sublattice磁性之间共享的浴室建模的。在我们的模型中，我们发现Néel订单参数是无耗散模式。对于抗铁磁铁，我们的结果提供了一个解释，说明了为什么NéelVector的耗散率通常远低于平均磁化强度的耗散率。通常，我们的结果提出了一种减少复合系统中某些模式的耗散（和变质）的方法，这些模式可能具有实验性和技术应用。
The coupling between a system and its environment (or bath) always leads to dissipation. We show, however, that a system composed of two subsystems can have a dissipation-free mode, if the bath is shared between the two subsystems. Reading in reverse, a shared bath does not contribute to the dissipation of all modes. As a key example, we consider a simple model for a two-sublattice antiferromagnet, where the environment is modeled by a bath that is shared between the two sublattice magnetizations. In our model, we find that the Néel order parameter is a dissipation-free mode. For antiferromagnets, our results offer an explanation for why the dissipation rate of the Néel vector is typically much lower than that of the average magnetization. In general, our results suggest a way to reduce dissipation (and decoherence) for some modes in composite systems, which could have experimental and technological applications.
