Multi-band spectroscopy of inhomogeneous Mott-insulator states of ultracold bosons
نویسندگان
چکیده
In this work, we use inelastic scattering of light to study the response of inhomogeneousMott-insulator gases to external excitations. The experimental setup and procedure to probe the atomic Mott states are presented in detail. We discuss the link between the energy absorbed by the gases and accessible experimental parameters as well as the linearity of the response to the scattering of light. We investigate the excitations of the system in multiple energy bands and a band-mapping technique allows us to identify band and momentum of the excited atoms. In addition, the momentum distribution in the Mott states that is spread over the entire first Brillouin zone enables us to reconstruct the dispersion relation in the high energy bands using a single Bragg excitation with a fixed momentum transfer. 1 Author to whom any correspondence should be addressed. New Journal of Physics 11 (2009) 10303
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