Mixing-demixing transition and collapse of a vortex state in a quasi-two-dimensional boson-fermion mixture

2007/04/18 by Sadhan K. Adhikari, Luca Salasnich · 19 citations
Physics and Astronomy · #Boson #Cold Atom Physics and Bose-Einstein Condensates #Condensed matter physics #Degenerate energy levels #Fermion #Mixing (physics) #Physics #Quantum mechanics #Quantum, superfluid, helium dynamics #Strong Light-Matter Interactions #Thermodynamics #Vortex #cond-mat.other

paper · pdf · doi:10.1103/physreva.75.053603

published in Physical Review A 75(5) (American Physical Society) · 9 pages, 11 figures

arxiv created 2007/04/18 · openalex publication_date 2007/05/08 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28

Abstract

We investigate the mixing-demixing transition and the collapse in a quasi-two-dimensional degenerate boson-fermion mixture (DBFM) with a bosonic vortex. We solve numerically a quantum-hydrodynamic model based on a new density functional which accurately takes into account the dimensional crossover. It is demonstrated that with the increase of interspecies repulsion, a mixed state of DBFM could turn into a demixed state. The system collapses for interspecies attraction above a critical value which depends on the vortex quantum number. For interspecies attraction just below this critical limit there is almost complete mixing of boson and fermion components. Such mixed and demixed states of a DBFM could be experimentally realized by varying an external magnetic field near a boson-fermion Feshbach resonance, which will result in a continuous variation of interspecies interaction.

Citations

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Cited by

• Structure of two-component Bose-Einstein condensates with respective vortex-antivortex superposition states
• Superfluid Bose-Fermi mixture from weak coupling to unitarity