论文标题
$ s = 1 $二聚体系统k $ _2 $ ni（moo $ _4 $）$ _ 2 $：镁玻色 - 因斯坦冷凝的候选人
The $S=1$ dimer system K$_2$Ni(MoO$_4$)$_2$: a candidate for magnon Bose-Einstein condensation
论文作者
论文摘要
二聚量子磁铁提供了一种独特的可能性，可以在低温下研究晶体系统中磁性激发的玻璃体凝结。在这里，我们对最近合成的旋转$ s = 1 $ dimer System k $ {} _ 2 $ ni（moo $ {} _ 4 $）$ _ 2 $的低温磁性特性建模基于对其电子结构的第一原理分析，我们得出了一个有效的自旋二聚体模型，我们首先在平均场近似中求解，以优化其参数与实验相比。最后，通过采用数值确切的量子蒙特卡洛技术来解决该模型，该技术导致磁性与实验磁化和热力学结果非常吻合。我们讨论了K $ {} _ 2 $ ni（Moo $ {} _ 4 $）$ _ 2 $的紧急旋转模型，以查看广泛参数方面的磁激励的凝结。最后，我们对所提出的模型的几何特殊性发表评论，并讨论如何在结构扭曲时托管超固体阶段。
Dimerized quantum magnets provide a unique possibility to investigate Bose-Einstein condensation of magnetic excitations in crystalline systems at low temperature. Here, we model the low-temperature magnetic properties of the recently synthesized spin $S=1$ dimer system K${}_2$Ni(MoO${}_4$)$_2$ and propose it as a new candidate material for triplon and quintuplon condensation. Based on a first principles analysis of its electronic structure, we derive an effective spin-dimer model that we first solve within a mean-field approximation to refine its parameters in comparison to experiment. Finally, the model is solved by employing a numerically exact quantum Monte Carlo technique which leads to magnetic properties in good agreement with experimental magnetization and thermodynamic results. We discuss the emergent spin model of K${}_2$Ni(MoO${}_4$)$_2$ in view of condensation of magnetic excitations in a broad parameter regime. Finally, we comment on a geometrical peculiarity of the proposed model and discuss how it could host a supersolid phase upon structural distortions.
