Ultracold Atoms in a Disordered Crystal of Light: Towards a Bose Glass

Autor: J. E. Lye, V. Guarrera, Leonardo Fallani, Massimo Inguscio, Chiara Fort
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