Physics – Condensed Matter – Quantum Gases
Scientific paper
2009-08-28
Nature Physics 6, 56 - 61 (2009)
Physics
Condensed Matter
Quantum Gases
13 pages, 5 figures
Scientific paper
10.1038/nphys1476
Strongly correlated many-body systems show various exciting phenomena in condensed matter physics such as high-temperature superconductivity and colossal magnetoresistance. Recently, strongly correlated phases could also be studied in ultracold quantum gases possessing analogies to solid-state physics, but moreover exhibiting new systems such as Fermi-Bose mixtures and magnetic quantum phases with high spin values. Particularly interesting systems here are quantum gases in optical lattices with fully tunable lattice and atomic interaction parameters. While in this context several concepts and ideas have already been studied theoretically and experimentally, there is still great demand for new detection techniques to explore these complex phases in detail. Here we report on measurements of a fully momentum-resolved excitation spectrum of a quantum gas in an optical lattice by means of Bragg spectroscopy. The bandstructure is measured with high resolution at several lattice depths. Interaction effects are identified and systematically studied varying density and excitation fraction.
Ernst P. T.
Götze Sören
Krauser Jasper Simon
Lühmann Dirk-Sören
Pfannkuche Daniela
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