Ultracold Atoms in a Disordered Crystal of Light: Towards a Bose Glass
Autor: | J. E. Lye, V. Guarrera, Leonardo Fallani, Massimo Inguscio, Chiara Fort |
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Rok vydání: | 2007 |
Předmět: | |
Zdroj: | Physical Review Letters. 98 |
ISSN: | 1079-7114 0031-9007 |
DOI: | 10.1103/physrevlett.98.130404 |
Popis: | We use a bichromatic optical lattice to experimentally realize a disordered system of ultracold strongly interacting $^{87}\mathrm{Rb}$ 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. |
Databáze: | OpenAIRE |
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