Journal
PHYSICAL REVIEW A
Volume 83, Issue 1, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevA.83.013610
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We study how the bosonic atoms on the excited p band of an optical lattice are coupled to the lowest s band and the second excited d band. We find that in some parameter regimes, the atom-atom interactions can cause a dynamical instability of the p-band atoms toward decay to the s and d bands. Furthermore, even when dynamical instability is not expected s and d bands can become substantially populated. We also find that the stability properties of the excited bands can be improved in superlattices.
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