Phonon instability and self-organized structures in multilayer stacks of confined dipolar Bose-Einstein condensates in optical lattices

Journal Article · Tue Dec 15 00:00:00 EST 2009 · Physical Review. A

DOI:https://doi.org/10.1103/PHYSREVA.80.063601· OSTI ID:21352393

Koeberle, Patrick; Wunner, Guenter ^[1]

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1. Institut fuer Theoretische Physik 1, Universitaet Stuttgart, 70550 Stuttgart (Germany)

In calculations to date [D.-W. Wang and E. Demler, e-print arXiv:0812.1838; M. Klawunn and L. Santos, Phys. Rev. A 80, 013611 (2009)] of multilayer stacks of dipolar condensates, created in one-dimensional optical lattices, the condensates have been assumed to be two dimensional. In a real experiment, however, the condensates do not extend to infinity in the oblate direction, but have to be confined by a trap potential, too. By three-dimensional numerical simulations of this realistic experimental situation we find a crucial dependence of the phonon instability boundary on the number of layers. Moreover, near the boundary of the phonon instability, a variety of structured ground-state wave functions emerges, which may indicate the onset of a roton instability [S. Ronen, D. C. E. Bortolotti, and J. L. Bohn, Phys. Rev. Lett. 98, 030406 (2007); R. M. Wilson, S. Ronen, J. L. Bohn, and H. Pu, Phys. Rev. Lett. 100, 245302 (2008)]. We also consider the effect of a variable number of atoms per layer on the appearance of the phonon instability.

• OSTI ID: 21352393
• Journal Information: Physical Review. A, Vol. 80, Issue 6; Other Information: DOI: 10.1103/PhysRevA.80.063601; (c) 2009 The American Physical Society; ISSN 1050-2947
• Country of Publication: United States
• Language: English

Related Subjects

71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
74 ATOMIC AND MOLECULAR PHYSICS
BOSE-EINSTEIN CONDENSATION
COMPUTERIZED SIMULATION
CONDENSATES
GROUND STATES
INSTABILITY
LAYERS
NUMERICAL ANALYSIS
ONE-DIMENSIONAL CALCULATIONS
PHONONS
THREE-DIMENSIONAL CALCULATIONS
TWO-DIMENSIONAL CALCULATIONS
WAVE FUNCTIONS
ENERGY LEVELS
FUNCTIONS
MATHEMATICS
QUASI PARTICLES
SIMULATION