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Q: Fachverband Quantenoptik und Photonik

Q 27: Ultra-cold Atoms, Ions and BEC II (joint session A/Q)

Q 27.2: Talk

Wednesday, March 8, 2023, 11:30–11:45, F303

Metastable phases in spinor Bose-Einstein condensates at finite temperatures — •Eduardo Serrano-Ensástiga1,2 and Francisco Mireles11Departamento de Física, Centro de Nanociencias y Nanotecnología, Universidad Nacional Autónoma de México, Ensenada, Baja California, México — 2Institut de Physique Nucléaire, Atomique et de Spectroscopie, CESAM, University of Liège, Liège, Belgium

Spinor Bose-Einstein condensates (BEC) with the spin as a degree of freedom have been studied intensively since its first experimental realization in 1998. A field with current scientific interest is the presence of metastable phases and their role in a variety of phenomena, such as domain formation, quench dynamics, or quantum dynamical phase transitions, among others. In this talk, we present the metastable spin-phase diagrams of a spinor BEC at finite temperatures for spin 1 and 2. The resulting phase diagrams offer further insights of the different quench dynamics observed in experiments, and they allow us to infer similar quench processes due to a sudden change in the temperature or other external fields. Our approach starts with the Hartree-Fock (HF) approximation but takes advantage of the common symmetries between the Hamiltonian and the order parameter. [1] E. Serrano-Ensástiga and F. Mireles, Phys. Rev. A 104, 063308 (2021). [2] E. Serrano-Ensástiga and F. Mireles, arXiv:2211.16428 (2022).

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