Crystallization in Ising quantum magnets
Crystallization in Ising quantum magnets
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DOI：
10.1126/science.1258351
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发表时间：
2015-03-27
期刊：
影响因子：
56.9
通讯作者：
Gross, C.
中科院分区：
文献类型：
--
作者：
Schauss, P.;Zeiher, J.;Gross, C.
在多体系统中占主导地位的有限程相互作用可以导致物质的有趣的自有序相。对于量子磁体，具有幂律相互作用的伊辛模型是支持这种相的最基本的系统之一。这些模型可以通过激光耦合超冷原子系综到里德堡态来实现。在这里，我们报告的实验制备结晶基态的自旋系统。我们观察到磁化阶梯与系统尺寸的函数关系，并直接显示了磁化率消失的结晶态的出现。我们的研究结果证明了里德堡多体系统的精确控制，并可能使相互作用的量子磁体中的相变和量子关联的未来研究。
Dominating finite-range interactions in many-body systems can lead to intriguing self-ordered phases of matter. For quantum magnets, Ising models with power-law interactions are among the most elementary systems that support such phases. These models can be implemented by laser coupling ensembles of ultracold atoms to Rydberg states. Here, we report on the experimental preparation of crystalline ground states of such spin systems. We observe a magnetization staircase as a function of the system size and show directly the emergence of crystalline states with vanishing susceptibility. Our results demonstrate the precise control of Rydberg many-body systems and may enable future studies of phase transitions and quantum correlations in interacting quantum magnets.