ABSTRACT
The combination of the two hot topics of spin-orbit coupling and honeycomb lattices leads to the appearance of fascinating issues. In this paper, we investigate the existence and stability of vector gap solitons of spin-orbit-coupled Bose-Einstein condensates loaded in honeycomb optical lattices. The existence and stability of vector gap solitons are highly sensitive to the properties of interspin and intraspin atomic interaction. We numerically obtain the parametric dependence of the existence of vector gap solitons both in the semi-infinite gap and in the first gap. Since only dynamically stable localized modes in nonlinear systems are likely to be generated and observed in experiments, we examine the stability of the vector gap solitons by using the direct evolution dynamics, and obtain the phase diagram of stable and unstable vector gap solitons on the parameter plane of interspin and intraspin atomic interactions.
ABSTRACT
The stability properties of dark solitons in quasi-one-dimensional Bose-Einstein condensate (BEC) loaded in a Jacobian elliptic sine potential with three-body interactions are investigated theoretically. The solitons are obtained by the Newton-Conjugate Gradient method. A stationary cubic-quintic nonlinear Schrödinger equation is derived to describe the profiles of solitons via the multi-scale technique. It is found that the three-body interaction has distinct effect on the stability properties of solitons. Especially, such a nonlinear system supports the so-called dark solitons (kink or bubble), which can be excited not only in the gap, but also in the band. The bubbles are always linearly and dynamically unstable, and they cannot be excited if the three-body interaction is absent. Both stable and unstable kinks, depending on the physical parameters, can be excited in the BEC system.
ABSTRACT
OBJECTIVE: To explore the effect of auricular points sticking-pressing (APSP) in treating post-cesarean hypogalactia (PCH). METHODS: A randomized, controlled, single-blinded clinical trial on 116 patients with PCH was carried out. They were equally assigned to the treatment group and the control group. The treatment group received APSP, with the pellets pressed for 4 times daily, while the control group was only asked to do lactation to meet infant demand. The therapeutic efficacy and the changes in scores of traditional Chinese medicine (TCM) syndrome, volume of milk secretion, supplementary feeding and serum level of prolactin (PRL) in the two groups were estimated and compared after the patients had been treated for 5 days. RESULTS: The cured and markedly effective rate in the treatment group was 89.7%, which was significantly higher than that in the control group (27.6%, P<0.05), 95% CI (0.1543, 0.2527). The improvement of TCM syndrome, elevation of milking volume, decrease of the supplementary feeding and increase of PRL level revealed in the treatment group were all superior to those in the control group, showing statistical significance (P<0.01). CONCLUSION: APSP shows an apparent efficacy in treating PCH and is worthy of application in clinical practice.