Physics – Condensed Matter – Quantum Gases
Scientific paper
2011-04-15
Physics
Condensed Matter
Quantum Gases
6 pages, 5 figures
Scientific paper
We use a coherent Bragg diffraction method to impart an external momentum to ultracold bosonic atoms trapped in a one-dimensional optical lattice. This method is based on the application of a single light pulse, with conditions where scattering of photons can be resonantly amplified by the atomic density grating. An oscillatory behavior of the momentum distribution resulting from the time evolution in the lattice potential is then observed. By measuring the oscillating frequencies, we extract multi-band energy structures of single-particle excitations with zero pseudo-momentum transfer for a wide range of lattice depths. The excitation energy structures reveal the interaction effect through the whole range of lattice depth.
Chen Xuzong
Liu Xinxing
Lu Bo
Vogt Thibault
Yue Xuguang
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