Modulational instability of two-component Bose-Einstein condensates in an optical lattice

Journal Article · Sat Oct 15 04:00:00 EDT 2005 · Physical Review. A

DOI:https://doi.org/10.1103/PhysRevA.72.045601· OSTI ID:20718830

Jin, Guang-Ri; Kim, Chul Koo ^[1]; Nahm, Kyun ^[2]

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1. Institute of Physics and Applied Physics, Yonsei University, Seoul 120-749 (Korea, Republic of)
2. Department of Physics, Yonsei University, Wonju 220-710 (Korea, Republic of)

We study modulational instability of two-component Bose-Einstein condensates in an optical lattice, which is modeled as a coupled discrete nonlinear Schroedinger (DNLS) equation. The excitation spectrum and the modulational instability condition of the total system are presented analytically. In the long-wavelength limit, our results agree with the homogeneous two-component Bose-Einstein condensates case. The discreteness effects result in the appearance of the modulational instability for the condensates in miscible region. The numerical calculations confirm our analytical results and show that the interspecies coupling can transfer the instability from one component to another.

• OSTI ID: 20718830
• Journal Information: Physical Review. A, Journal Name: Physical Review. A Journal Issue: 4 Vol. 72; ISSN 1050-2947; ISSN PLRAAN
• Country of Publication: United States
• Language: English

Related Subjects

74 ATOMIC AND MOLECULAR PHYSICS
ABSORPTION SPECTRA
BOSE-EINSTEIN CONDENSATION
COUPLING
EXCITATION
INSTABILITY
NONLINEAR PROBLEMS
SCHROEDINGER EQUATION
WAVELENGTHS