The phase-separation mechanism of a binary mixture in a ring trimer

Abstract

We show that, depending on the ratio between the inter- and the intra-species interactions, a binary mixture trapped in a three-well potential with periodic boundary conditions exhibits three macroscopic ground-state configurations which differ in the degree of mixing. Accordingly, the corresponding quantum states feature either delocalization or a Schrödinger cat-like structure. The two-step phase separation occurring in the system, which is smoothed by the activation of tunnelling processes, is confirmed by the analysis of the energy spectrum that collapses and rearranges at the two critical points. In such points, we show that also Entanglement Entropy, a quantity borrowed from quantum-information theory, features singularities, thus demonstrating its ability to witness the double mixining-demixing phase transition. The developed analysis, which is of interest to both the experimental and theoretical communities, opens the door to the study of the demixing mechanism in complex lattice geometries.

14 pages, 9 figures

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Cited by in corpus (11)

• Interaction-resistant metals in multicomponent Fermi systems
• The mixing-demixing phase diagram of ultracold heteronuclear mixtures in a ring trimer
• Phase separation can be stronger than chaos
• Pathway toward the formation of supermixed states in ultracold boson mixtures loaded in ring lattices
• Making ghost vortices visible in two-component Bose-Einstein condensates
• Quantum-classical correspondence of a system of interacting bosons in a triple-well potential
• Enhancement of chiral edge currents in ($d$+1)-dimensional atomic Mott-band hybrid insulators
• Phase separation of a Bose-Bose mixture: impact of the trap and particle number imbalance
• Spatial Phase Separation of a Binary Mixture in a Ring Trimer
• Quantum-granularity effect in the formation of supermixed solitons in ring lattices
• Entangling lattice-trapped bosons with a free impurity: impact on stationary and dynamical properties