Fragmented many-body states of definite angular momentum and stability of attractive three-dimensional condensates

Journal Article · Wed Sep 15 00:00:00 EDT 2010 · Physical Review. A

DOI:https://doi.org/10.1103/PHYSREVA.82.033613· OSTI ID:21450614

Tsatsos, Marios C; Streltsov, Alexej I; Alon, Ofir E; Cederbaum, Lorenz S ^[1]

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1. Theoretische Chemie, Physikalisch-Chemisches Institut, Universitaet Heidelberg, Im Neuenheimer Feld 229, D-69120 Heidelberg (Germany)

A three-dimensional attractive Bose-Einstein condensate is expected to collapse when the number of the particles N in the ground state or the interaction strength {lambda}{sub 0} exceeds a critical value. We study systems of different particle numbers and interaction strength and find that even if the overall ground state is collapsed there is a plethora of fragmented excited states that are still in the metastable region. Utilizing the configuration interaction expansion we determine the spectrum of the ground (''yrast'') and excited many-body states with definite total angular-momentum quantum numbers 0{<=}L{<=}N and -L{<=}M{sub L{<=}}L, and we find and examine states that survive the collapse. This opens up the possibility of realizing a metastable system with overcritical numbers of bosons in a ground state with angular momentum L{ne}0. The multiorbital mean-field theory predictions about the existence of fragmented metastable states with overcritical numbers of bosons are verified and elucidated at the many-body level. The descriptions of the total angular momentum within the mean-field and the many-body approaches are compared.

• OSTI ID: 21450614
• Journal Information: Physical Review. A, Vol. 82, Issue 3; Other Information: DOI: 10.1103/PhysRevA.82.033613; (c) 2010 The American Physical Society; ISSN 1050-2947
• Country of Publication: United States
• Language: English

Related Subjects

74 ATOMIC AND MOLECULAR PHYSICS
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ANGULAR MOMENTUM
BOSE-EINSTEIN CONDENSATION
BOSONS
CONFIGURATION INTERACTION
GROUND STATES
MANY-BODY PROBLEM
MEAN-FIELD THEORY
METASTABLE STATES
PHASE STABILITY
QUANTUM NUMBERS
THREE-DIMENSIONAL CALCULATIONS
ENERGY LEVELS
EXCITED STATES
STABILITY