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Instabilities in Binary Mixtures of One-Dimensional Quantum Degenerate Gases

Instabilities in Binary Mixtures of One-Dimensional Quantum Degenerate Gases

We show that one-dimensional binary mixtures of bosons or of a boson and a spin-polarized fermion are Luttinger liquids with the following instabilities: (i) For different particle densities, strong attraction between the mixture components leads to collapse, while strong repulsion leads to demixing, and (ii) For a low-density mixture of …