Impurity induced Modulational instability in Bose-Einstein condensates
arXiv:2301.03806 · doi:10.1016/j.physleta.2023.128640
Abstract
By means of linear stability analysis (LSA) and direct numerical simulations of the coupled Gross-Pitaevskii(GP)equations, we address the impurity induced modulational instability (MI) and the associated nonlinear dynamics in Bose-Einstein condensates (BECs). We explore the dual role played by the impurities within the BECs -- the instigation of MI and the dissipation of the initially generated solitary waves. Because of the impurities, the repulsive BECs are even modulationally unstable and this tendency towards MI increases with increasing impurity fraction and superfluid-impurity coupling strength. However, the tendency of a given BEC towards the MI decreases with the decreasing mass of the impurity atoms while the sign of the superfluid-impurity interaction plays no role. The above results are true even for attractive BECs except for a weak superfluid-impurity coupling, where the MI phenomenon is marginally suppressed by the presence of impurities. The dissipation of the solitons reduces their lifetime and is eminent for a larger impurity fraction and strong superfluid-impurity strength respectively.
A new reference added, Accepted for publication in Phys. Lett. A 2023
References in corpus (8)
- Self-bound droplets of a dilute magnetic quantum liquid
- Spin dynamics in a one-dimensional ferromagnetic Bose gas
- Modulation instability and solitary wave formation in two-component Bose-Einstein condensates
- Spin-charge separation in two-component Bose-gases
- Controlling phase separation of a two-component Bose-Einstein condensate by confinement
- Onset of a modulational instability in trapped dipolar Bose-Einstein condensates
- Modulational instability and soliton generation in chiral Bose-Einstein condensates with zero-energy nonlinearity
- Modulational instability in wind-forced waves