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• W3025881423 abstract "We explore a few-body mixture of two bosonic species confined in quasi-one-dimensional parabolic traps of different length scales. The ground state phase diagrams in the three-dimensional parameter space spanned by the harmonic length scale ratio, inter-species coupling strength and particle number ratio are investigated. As a first case study we use the mean-field ansatz (MF) to perform a detailed analysis of the separation mechanism. It allows us to derive a simple and intuitive rule predicting which of the immiscible phases is energetically more favorable at the miscible-immiscible phase boundary. We estimate the critical coupling strength for the miscible-immiscible transition and perform a comparison to correlated many-body results obtained by means of the Multi-Layer Multi-Configuration Time Dependent Hartree method for bosonic mixtures (ML-X). At a critical ratio of the trap frequencies, determined solely by the particle number ratio, the deviations between MF and ML-X are very pronounced and can be attributed to a high degree of entanglement between the components. As a result, we evidence the breakdown of the effective one-body picture. Additionally, when many-body correlations play a substantial role, the one-body density is in general not sufficient for deciding upon the phase at hand which we demonstrate exemplarily." @default.
• W3025881423 created "2020-05-21" @default.
• W3025881423 creator A5049298471 @default.
• W3025881423 creator A5064525551 @default.
• W3025881423 date "2020-08-05" @default.
• W3025881423 modified "2023-09-24" @default.
• W3025881423 title "Phase separation of a Bose-Bose mixture: Impact of the trap and particle-number imbalance" @default.
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• W3025881423 doi "https://doi.org/10.1103/physreva.102.023305" @default.
• W3025881423 hasPublicationYear "2020" @default.

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