کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
5418342 | 1506989 | 2006 | 8 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Coupled-cluster theory for bosons in rings and optical lattices
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
شیمی
شیمی تئوریک و عملی
پیش نمایش صفحه اول مقاله
![عکس صفحه اول مقاله: Coupled-cluster theory for bosons in rings and optical lattices Coupled-cluster theory for bosons in rings and optical lattices](/preview/png/5418342.png)
چکیده انگلیسی
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.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Molecular Structure: THEOCHEM - Volume 768, Issues 1â3, 31 August 2006, Pages 151-158
Journal: Journal of Molecular Structure: THEOCHEM - Volume 768, Issues 1â3, 31 August 2006, Pages 151-158
نویسندگان
Ofir E. Alon, Alexej I. Streltsov, Lorenz S. Cederbaum,