We report an analysis of the inhomogeneous broadening of the excitation spectrum of a three-dimensional (3D) Mott insulator (MI) due to the presence of weak disorder. We present a theoretical model predicting the modification in the spectrum and compare the results to the experimental data obtained for a system of ultracold 87Rb atoms in a 3D optical lattice, where quasi-disorder is added by means of an auxiliary 1D optical lattice with non-commensurate wavelength. The model shows good agreement with the measured points, confirming a significant broadening of the MI spectrum resonances even for a very small height of the disordering potential.
Inhomogeneous broadening of a Mott insulator spectrum / V. Guarrera; L. Fallani; J. E. Lye; C. Fort; M. Inguscio. - In: NEW JOURNAL OF PHYSICS. - ISSN 1367-2630. - ELETTRONICO. - 9:(2007), pp. 107-107. [10.1088/1367-2630/9/4/107]
Inhomogeneous broadening of a Mott insulator spectrum
FALLANI, LEONARDO;FORT, CHIARA;INGUSCIO, MASSIMO
2007
Abstract
We report an analysis of the inhomogeneous broadening of the excitation spectrum of a three-dimensional (3D) Mott insulator (MI) due to the presence of weak disorder. We present a theoretical model predicting the modification in the spectrum and compare the results to the experimental data obtained for a system of ultracold 87Rb atoms in a 3D optical lattice, where quasi-disorder is added by means of an auxiliary 1D optical lattice with non-commensurate wavelength. The model shows good agreement with the measured points, confirming a significant broadening of the MI spectrum resonances even for a very small height of the disordering potential.File | Dimensione | Formato | |
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Inhomogeneous broadening of a MI spectrum [NJP 9, 107 (2007)].pdf
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