Ultracold atoms in a disordered crystal of light: Towards a Bose glass
Ultracold atoms in a disordered crystal of light: Towards a Bose glass
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DOI：
10.1103/physrevlett.98.130404
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发表时间：
2007-03-30
影响因子：
8.6
通讯作者：
Inguscio, M.
中科院分区：
文献类型：
--
作者：
Fallani, L.;Lye, J. E.;Inguscio, M.
我们利用双色光学晶格实验实现了一个超冷强相互作用Rb-87玻色子的无序系统。在没有无序的情况下，原子在理想光学晶体的位置上被排斥相互作用所束缚，形成一维莫特绝缘体状态。我们测量了系统的激发谱作为无序强度的函数，并用飞行时间技术表征了系统的相相干特性。随着无序度的增加，我们观察到莫特-绝缘子共振的扩大，以及向远程相相干性消失和激发密度平坦的状态的转变，这表明玻色-玻璃相的形成。
We use a bichromatic optical lattice to experimentally realize a disordered system of ultracold strongly interacting Rb-87 bosons. In the absence of disorder, the atoms are pinned by repulsive interactions in the sites of an ideal optical crystal, forming one-dimensional Mott-insulator states. We measure the excitation spectrum of the system as a function of disorder strength and characterize its phase-coherence properties with a time-of-flight technique. Increasing disorder, we observe a broadening of the Mott-insulator resonances and the transition to a state with vanishing long-range phase coherence and a flat density of excitations, which suggest the formation of a Bose-glass phase.