自旋冰中约束跃迁和磁化平台的平均场论
Mean-field theory for confinement transitions and magnetization plateaux in spin ice
摘要：
我们研究在非零磁化的经典自旋冰相变，通过引入平均场论，旨在捕捉禁闭和拓扑约束之间的相互作用。该方法被应用到一个模型的自旋冰在沿[100]晶向的外加磁场，并产生一个相图包含库仑相以及一组磁化平台。我们认为，波瓣结构的相图，强烈地让人想起玻色-哈伯德模型，是通用的库仑自旋液体。
英文摘要：
We study phase transitions in classical spin ice at nonzero magnetization, by introducing a mean-field theory designed to capture the interplay between confinement and topological constraints. The method is applied to a model of spin ice in an applied magnetic field along the [100] crystallographic direction and yields a phase diagram containing the Coulomb phase as well as a set of magnetization plateaux. We argue that the lobe structure of the phase diagram, strongly reminiscent of the Bose-Hubbard model, is generic to Coulomb spin liquids.
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