期刊
PHYSICAL REVIEW LETTERS
卷 125, 期 5, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.125.050405
关键词
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资金
- National Science Foundation [PHY-1402249, PHY-1607221, PHY-1912542]
- Binational (U.S.Israel) Science Foundation [2015616]
- Army Research Office Multidisciplinary University Research Initiative [W911NF-14-1-0003]
- Office of Naval Research
- NSF [PHY-1707992]
- Welch Foundation [C-1133]
- Israel Science Foundation [1286/17]
- German Aeronautics and Space Administration (DLR) [50 WM 1957]
- Tel Aviv University-Swinburne University of Technology Research Collaboration award
We study quantum fluctuations of macroscopic parameters of a nonlinear Schrodinger breather-a nonlinear superposition of two solitons, which can be created by the application of a fourfold quench of the scattering length to the fundamental soliton in a self-attractive quasi-one-dimensional Bose gas. The fluctuations are analyzed in the framework of the Bogoliubov approach in the limit of a large number of atoms N, using two models of the vacuum state: white noise and correlated noise. The latter model, closer to the ab initio setting by construction, leads to a reasonable agreement, within 20% accuracy, with fluctuations of the relative velocity of constituent solitons obtained from the exact Bethe-ansatz results [Phys. Rev. Lett. 119, 220401 (2017)] in the opposite low-N limit (for N <= 23). We thus confirm, for macroscopic N, the breather dissociation time to be within the limits of current cold-atom experiments. Fluctuations of soliton masses, phases, and positions are also evaluated and may have experimental implications.
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