Quantum lattice solitons in ultracold bosons near Feshbach resonance

Details Quantum lattice solitons in ultracold bosons near Feshbach resonance Quantum lattice solitons in ultracold bosons near Feshbach resonance

2005-06-29

arxiv.org/abs/cond-mat/0506766v2

J. Phys. B 39, 3507-3517 (2006)

Physics

Condensed Matter

Other Condensed Matter

Scientific paper

10.1088/0953-4075/39/17/008

Quantum lattice solitons in a system of two ultracold bosons near Feshbach resonance are investigated. It is shown that their binding energy, effective mass, and spatial width, can be manipulated varying the detuning from the Feshbach resonance. In the case of attractive atomic interactions, the molecule creation stabilizes the solitons. In the case of repulsive interactions, the molecule creation leads to the possibility of existence of bright solitons in some interval of detunings. Due to quantum fluctuations the soliton width is a random quantity. Its standard deviation is larger than the mean value for such a small number of particles.

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