Dipole and monopole modes in the Bose-Hubbard model in a trap
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
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.
IdentifiersURN: urn:nbn:se:kth:diva-40981DOI: 10.1103/PhysRevA.70.033610ISI: 000224623000126ScopusID: 2-s2.0-19644400968OAI: oai:DiVA.org:kth-40981DiVA: diva2:443023
QC 201109232011-09-232011-09-232011-09-23Bibliographically approved