Dynamical instability and dispersion management of an attractive condensate in an optical lattice

Journal Article · Mon Oct 15 00:00:00 EDT 2007 · Physical Review. A

DOI:https://doi.org/10.1103/PHYSREVA.76.041601· OSTI ID:21020639

Barontini, G ^[1]; Modugno, M ^[2]

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1. LENS and Dipartimento di Fisica, Universita di Firenze via Nello Carrara 1, I-50019 Sesto Fiorentino (Italy)
2. LENS, Dipartimento di Matematica Applicata, Universita di Firenze and INFN (Italy)

We investigate the stability of an attractive Bose-Einstein condensate in a one-dimensional lattice in the presence of radial confinement. We find that the system is dynamically unstable for low quasimomenta and becomes stable near the band edge, in a specular fashion with respect to the repulsive case. For low interactions the instability occurs via long-wavelength excitations that produce an oscillating density pattern in both real and momentum space instead of spoiling the condensate coherence. This behavior is illustrated by simulations for the expansion of the condensate in a moving lattice.

• OSTI ID: 21020639
• Journal Information: Physical Review. A, Vol. 76, Issue 4; Other Information: DOI: 10.1103/PhysRevA.76.041601; (c) 2007 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); ISSN 1050-2947
• Country of Publication: United States
• Language: English

Related Subjects

71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
BOSE-EINSTEIN CONDENSATION
CONDENSATES
CONFINEMENT
DENSITY
EXCITATION
EXPANSION
INSTABILITY
INTERACTIONS
ONE-DIMENSIONAL CALCULATIONS
SIMULATION
STABILITY
WAVELENGTHS