First-order phase transition in atom-molecule quantum degenerate mixtures with coherent three-body recombination

• URL: http://arxiv.org/abs/2602.11637v1
• Date: Thu, 12 Feb 2026 06:41:27 GMT
• Title: First-order phase transition in atom-molecule quantum degenerate mixtures with coherent three-body recombination
• Authors: G. A. Bougas, A. Vardi, H. R. Sadeghpour, C. Chin, S. I. Mistakidis,
• Abstract summary: We map the phase diagram of a two-mode atom-molecule Bose-Einstein condensate with Fano-Feshbach and coherent three-body recombination terms.<n>Our results establish cTBR as a powerful knob for quantum state engineering and control of reaction dynamics in ultracold chemistry.
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• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: We map the phase diagram of a two-mode atom-molecule Bose-Einstein condensate with Fano-Feshbach and coherent three-body recombination (cTBR) terms. The standard second order phase transition observed as the molecular energy is tuned through the Feshbach resonance, is replaced by a first order transition when cTBR becomes prominent, due to a double-well structure in the free energy landscape. This transition is associated with atom-molecule entanglement, bistability, and molecular metastability. Our results establish cTBR as a powerful knob for quantum state engineering and control of reaction dynamics in ultracold chemistry.

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