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Dipole and monopole modes in the Bose-Hubbard model in a trap
KTH, Superseded Departments, Physics.
2004 (English)In: Physical Review A. Atomic, Molecular, and Optical Physics, ISSN 1050-2947, E-ISSN 1094-1622, Vol. 70, no 3, 033610- p.Article in journal (Refereed) Published
Abstract [en]

The lowest-lying collective modes of a trapped Bose gas in an optical lattice are studied in the Bose-Hubbard model. An exact diagonalization of the Hamiltonian is performed in a one-dimensional five-particle system in order to find the lowest few eigenstates. The dipole and breathing character of the eigenstates is confirmed in the limit where the tunneling dominates the dynamics, but under Mott-like conditions the excitations do not correspond to oscillatory modes.

Place, publisher, year, edition, pages
2004. Vol. 70, no 3, 033610- p.
National Category
Physical Sciences
URN: urn:nbn:se:kth:diva-40981DOI: 10.1103/PhysRevA.70.033610ISI: 000224623000126ScopusID: 2-s2.0-19644400968OAI: diva2:443023
QC 20110923Available from: 2011-09-23 Created: 2011-09-23 Last updated: 2011-09-23Bibliographically approved

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