One-dimensional purely Lee-Huang-Yang fluids dominated by quantum fluctuations in two-component Bose-Einstein condensates

Lee-Huang-Yang (LHY) fluids are an exotic quantum matter dominated purely by quantum fluctuations. Re-cently, the three-dimensional LHY fluids were observed in ultracold atoms experiments, while their low-dimensional counterparts have not been well known. Herein, based on the Gross-Pitaevskii equation of one-dimensional LHY quantum fluids in two-component Bose-Einstein condensates, we reveal analytically and nu-merically the formation, properties, and dynamics of matter-wave structures therein. Considering a harmonic trap, approximate analytical results are obtained based on variational approximation, and higher-order nonlinear localized modes with nonzero nodes are constructed numerically. Stability regions of all the LHY nonlinear local-ized modes are identified by linear-stability analysis and direct perturbed numerical simulations. Movements and oscillations of single localized mode, and collisions between two modes, under the influence of different ini-tial kicks are also studied in dynamical evolutions. The predicted results are available to quantum-gas experi-ments, providing a new insight into LHY physics in low-dimensional settings.(c) 2022 Elsevier Ltd. All rights reserved.

Automated summary

In this study, the formation, properties, and dynamics of matter-wave structures in one-dimensional LHY quantum fluids are analyzed and numerically simulated. The findings are significant for quantum-gas experiments, providing new insights into low-dimensional LHY physics.