Modulation instability and solitary-wave formation in two-component Bose-Einstein condensates
Kenichi KasamatsuDepartment of General Education, Ishikawa National College of Technology, Tsubata, Ishikawa 929-0392, JapanMakoto TsubotaDepartment of Physics, Osaka City University, Sumiyoshi-Ku, Osaka 558-8585, Japan
2006en
ABI
Abstract
We investigate nonlinear dynamics induced by the modulation instability of a two-component mixture in an atomic Bose-Einstein condensate. The nonlinear dynamics is examined using numerical simulations of the time-dependent coupled Gross-Pitaevskii equations. The unstable modulation grows from initially miscible condensates into various types of vector solitary waves, depending on the combinations of the sign of the coupling constants (intracomponent and intercomponent). We discuss the detailed features of the modulation instability, dynamics of solitary wave formation, and an analogy with the collapsing dynamics in a single-component condensate with attractive interactions.
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