Higher-order effective interactions for bosons near a two-body zero crossing
| Autor: | Pricoupenko, A., Petrov, D. S. |
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| Rok vydání: | 2020 |
| Předmět: | |
| Zdroj: | Phys. Rev. A 103, 033326 (2021) |
| Druh dokumentu: | Working Paper |
| DOI: | 10.1103/PhysRevA.103.033326 |
| Popis: | We develop the perturbation theory for bosons interacting via a two-body potential $V$ of vanishing mean value. We find that the leading nonpairwise contribution to the energy emerges in the third order in $V$ and represents an effective three-body interaction, the sign of which in most cases (although not in general) is anticorrelated with the sign of the long-range tail of $V$. Explicit results are obtained for a few particular two-body interaction potentials and we perform a detailed perturbative analysis of tilted dipoles in quasi-low-dimensional geometries. Comment: 11 pages, 1 figure |
| Databáze: | arXiv |
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