论文标题
违反旋转定理的波动定理和自旋冰中的有效温度
Violation of the fluctuation-dissipation theorem and effective temperatures in spin ice
论文作者
论文摘要
我们介绍了带有适用于滴钛dyprosium titanate的参数的自旋冰模型中波动 - 散文定理（FDT）的数值测试。这些测试是针对局部自旋变量，磁性单极密度和能量进行的。我们能够达到本地平衡，其中FDT满足到$ t = 0.4 $ K，而该系统完全冻结了。尽管如此，在非平衡动力学以及违反FDT的情况下，在热淬灭中，仍观察到进入不可扣除的单极对制度。尽管违反了FDT，但近似的线性响应制度允许识别每个变量不同的有效非平衡温度。自旋变量比热储层更热，单极浓度以较低的有效温度响应，而能量的有效温度为负。在旋转冰的单极图片的背景下，与其他玻璃材料中的FDT违规结构进行了讨论。审查未来实验的准人。
We present numerical tests of the fluctuation-dissipation theorem (FDT) in the dumbbell model of spin ice with parameters suitable for dysprosium titanate. The tests are made for local spin variables, magnetic monopole density, and energy. We are able to achieve local equilibrium in which the FDT is satisfied down to $T=0.4$ K below which the system completely freezes. Non-equilibrium dynamics, together with violation of the FDT, are nonetheless observed following a thermal quench into the non-contractable monopole pair regime. Despite FDT violation, an approximate linear response regime allows for the identification of effective non-equilibrium temperatures which are different for each variable. The spin variable appears hotter than the heat reservoir, the monopole concentration responds with a lower effective temperature while the energy has a negative effective temperature. Results are discussed in the context of the monopole picture of spin ice and compared to the structure of FDT violations in other glassy materials. Prospectives for future experiments are reviewed.
