Inhomogeneous broadening of a Mott insulator spectrum

Details Inhomogeneous broadening of a Mott insulator spectrum Inhomogeneous broadening of a Mott insulator spectrum

Apr 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007njph....9..107g&link_type=abstract

New Journal of Physics, Volume 9, Issue 4, pp. 107 (2007).

Physics

10

Scientific paper

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.

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