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• W2088150329 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=∑n=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)=∑n=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." @default.
• W2088150329 created "2016-06-24" @default.
• W2088150329 creator A5014971692 @default.
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• W2088150329 date "2006-08-01" @default.
• W2088150329 modified "2023-10-17" @default.
• W2088150329 title "Coupled-cluster theory for bosons in rings and optical lattices" @default.
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• W2088150329 doi "https://doi.org/10.1016/j.theochem.2006.05.026" @default.
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