Observation of a modulational instability in Bose-Einstein condensates

被引:85
作者
Everitt, P. J. [1 ]
Sooriyabandara, M. A. [1 ]
Guasoni, M. [2 ]
Wigley, P. B. [1 ]
Wei, C. H. [1 ,3 ]
McDonald, G. D. [1 ]
Hardman, K. S. [1 ]
Manju, P. [1 ]
Close, J. D. [1 ]
Kuhn, C. C. N. [1 ]
Szigeti, S. S. [4 ,5 ]
Kivshar, Y. S. [2 ]
Robins, N. P. [1 ]
机构
[1] Australian Natl Univ, Dept Quantum Sci, Res Sch Phys & Engn, Canberra, ACT 2601, Australia
[2] Australian Natl Univ, Res Sch Phys & Engn, Nonlinear Phys Ctr, Canberra, ACT 2601, Australia
[3] Natl Univ Def Technol, Dept Instrument Sci & Technol, Coll Mechatron Engn & Automat, Changsha 410073, Hunan, Peoples R China
[4] Univ Otago, Dept Phys, Ctr Quantum Sci, Dunedin 9010, New Zealand
[5] Univ Otago, Dodd Walls Ctr Photon & Quantum Technol, Dunedin 9010, New Zealand
基金
澳大利亚研究理事会;
关键词
D O I
10.1103/PhysRevA.96.041601
中图分类号
O43 [光学];
学科分类号
070207 ; 0803 ;
摘要
We observe the breakup dynamics of an elongated cloud of condensed Rb-85 atoms placed in an optical waveguide. The number of localized spatial components observed in the breakup is compared with the number of solitons predicted by a plane-wave stability analysis of the nonpolynomial nonlinear Schrodinger equation, an effective one-dimensional approximation of the Gross-Pitaevskii equation for cigar-shaped condensates. It is shown that the numbers predicted from the fastest growing sidebands are consistent with the experimental data, suggesting that modulational instability is the key underlying physical mechanism driving the breakup.
引用
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页数:5
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