Rudolf Peierls Centre for Theoretical Physics and Worcester College, Oxford University, Oxford OX1 3NP, United Kingdom.
Phys Rev Lett. 2010 Mar 12;104(10):107201. doi: 10.1103/PhysRevLett.104.107201.
We study the diffusion-annihilation process which occurs when spin ice is quenched from a high temperature paramagnetic phase deep into the spin-ice regime, where the excitations--magnetic monopoles--are sparse. We find that due to the Coulomb interaction between the monopoles, a dynamical arrest occurs, in which nonuniversal lattice-scale constraints impede the complete decay of charge fluctuations. This phenomenon is outside the reach of conventional mean-field theory for a two-component Coulomb liquid. We identify the relevant time scales for the dynamical arrest and propose an experiment for detecting monopoles and their dynamics in spin ice based on this nonequilibrium phenomenon.
我们研究了当自旋冰从高温顺磁相淬火到自旋冰区深处时发生的扩散-湮灭过程，在该区域中，激发——磁单极子——稀疏。我们发现，由于单极子之间的库仑相互作用，会发生动力学捕获，其中非普遍的晶格尺度约束阻碍了电荷涨落的完全衰减。这种现象超出了传统的两分量库仑液体的平均场理论的范围。我们确定了动力学捕获的相关时间尺度，并提出了一个实验，基于这种非平衡现象来检测自旋冰中的磁单极子及其动力学。
