Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
5418342 | Journal of Molecular Structure: THEOCHEM | 2006 | 8 Pages |
Abstract
Bosons in optical lattices and rings are attractive and active fields of research in cold-atom physics. Here, we apply our recently developed coupled-cluster approach for bosons in external traps to these systems, and extend it to the lowest-in-energy excited states with total quasi- or angular-momentum k. In the coupled-cluster approach the exact many-boson ground state is obtained by applying an exponential operator exp{T}, T=ân=1NTn to the ground configuration, which is (usually) the state where the bosons occupy a single orbital. For excited states, a second exponential operator exp{T(k)}, T(k)=ân=1NTn(k) is employed to accommodate the remaining excitations from the unperturbed excited configuration. Due to the conservation of momentum, T1 and T1(k) can vanish. Working equations for coupled-cluster (singles) doubles (CCD) are provided and their implications are briefly discussed.
Related Topics
Physical Sciences and Engineering
Chemistry
Physical and Theoretical Chemistry
Authors
Ofir E. Alon, Alexej I. Streltsov, Lorenz S. Cederbaum,