Uncertainty product of an out-of-equilibrium Bose-Einstein condensate

25th Annual International Laser Physics Workshop

Klaiman, S.^1 ; Streltsov, A.I.^1 ; Alon, O.E.^2

Theoretische Chemie, Heidelberg University, Heidelberg, Germany^1

Department of Physics, University of Haifa at Oranim, Tivon, Israel^2

关键词: A-particles;    Bose-Einstein condensates;    Inter-particle interaction;    Long ranges;    Monotonous functions;    Out of equilibrium;    Particle operators;    Single well;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/826/1/012020/pdf
DOI  :  10.1088/1742-6596/826/1/012020

来源: IOP

【 摘 要 】

The variance and uncertainty product of the position and momentum many-particle operators of structureless bosons interacting by a long-range inter-particle interaction and trapped in a single-well potential are investigated. In the first example, of an out-of-equilibrium interaction-quench scenario, it is found that, despite the system being fully condensed, already when a fraction of a particle is depleted differences with respect to the mean-field quantities emerge. In the second example, of the pathway from condensation to fragmentation of the ground state, we find out that, although the cloud's density broadens while the system's fragments, the position variance actually decreases, the momentum variance increases, and the uncertainty product is not a monotonous function but has a maximum. Implication are briefly discussed.