Quantum phase transition in a 2D atomic Bose gas with a g-wave Feshbach resonance

• URL: http://arxiv.org/abs/2505.19070v1
• Date: Sun, 25 May 2025 10:07:11 GMT
• Title: Quantum phase transition in a 2D atomic Bose gas with a g-wave Feshbach resonance
• Authors: Fan Zhang, Lan Yin,
• Abstract summary: We study quantum phase transition in quasi-2D atomic Bose gas with a g-wave Feshbach resonance.<n>We show two phase transitions in this system: from a phase with only a atomic Bose-Einstein condensate to a phase with coexistence of atomic and molecular condensation.
• Score: 2.3498163541080683
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: Recent repoet on the formation of two-dimensional Bose-Einstein condensates (BECs) of spinning g-wave molecules is surprise. Here we study quantum phase transition in the quasi-2D atomic Bose gas with a g-wave Feshbach resonance, and show that there are two phase transitions in this system: from a phase with only a atomic Bose-Einstein condensate to a phase with coexistence of atomic and molecular condensation and from the coexistence phase to a phase with only a molecular Bose-Einstein condensate. We show that the g-wave resonance Feshbach has two features in the phase transitions, a phase with only a atomic Bose-Einstein condensate is no longer forbidden and resonance effects appear only at levels beyond the mean-field. We determine the T=0 beyond mean-field phase diagram of the gas as a function of magnetic field and molecular condensation density. We also detemine the ratio of atomic to molecular condensation in the coexistence phase, which can be tested in experiments.

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