Effects of thermal and quantum fluctuations on the phase diagram of a spin-1 87Rb Bose-Einstein condensate

Abstract

We investigate effects of thermal and quantum fluctuations on the phase diagram of a spin-1 87Rb Bose-Einstein condensate (BEC) under a quadratic Zeeman effect. Due to the large ratio of spinindependent to spin-dependent interactions of 87Rb atoms, the effect of noncondensed atoms on the condensate is much more significant than that in scalar BECs. We find that the condensate and spontaneous magnetization emerge at different temperatures when the ground state is in the brokenaxisymmetry phase. In this phase, a magnetized condensate induces spin coherence of noncondensed atoms in different magnetic sublevels, resulting in temperature-dependent magnetization of the noncondensate. We also examine the effect of quantum fluctuations on the order parameter at absolute zero, and find that the ground-state phase diagram is significantly altered by quantum depletion.

Comment: 21 pages, 7 figures Comment: 20 pages, 7 figures, paper reconstructed, nomenclature changed, references added, grammatical errors corrected

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Cited by in corpus (23)

• Spinor Bose-Einstein condensates
• Phase diagram of spin 1 antiferromagnetic Bose-Einstein condensates
• Antiferromagnetic Spatial Ordering in a Quenched One-dimensional Spinor Gas
• Quantum quench and non-equilibrium dynamics in lattice-confined spinor condensates
• Spontaneous formation and relaxation of spin domains in antiferromagnetic spin-1 quasi-condensates
• Stepwise Bose-Einstein condensation in a spinor gas
• Finite temperature phase diagram of a spin-1 Bose gas
• Beliaev theory of spinor Bose-Einstein condensates
• Collective excitations in cigar-shaped spin-orbit coupled spin-1 Bose-Einstein condensates
• Condensation and thermalization of an easy-plane ferromagnet in a spinor Bose gas
• Spontaneous symmetry breaking in spinor Bose-Einstein condensates
• Thermodynamics of a spin-1 Bose gas with fixed magnetization
• Thermal fluctuations and quantum phase transition in antiferromagnetic Bose-Einstein condensates
• Superfluidity and spin superfluidity in spinor Bose gases
• Manipulating atom-number distributions and detecting spatial distributions in lattice-confined spinor gases
• Fluctuations of spinor Bose-Einstein condensates
• Phase diagrams and multistep condensations of spin-1 bosonic gases in optical lattices
• Magnetic resonance spectroscopy and characterization of magnetic phases for spinor Bose-Einstein condensates
• Metastable spin-phase diagrams in antiferromagnetic Bose-Einstein condensates
• A variational approach for the ground state profile of a trapped spinor-BEC: A detailed study of phase transition in spin-1 condensate at zero magnetic field
• Multi-component states for trapped spin-1 Bose-Einstein Condensates in the presence of magnetic field
• Thermal amplification and melting of phases in spin-orbit-coupled spin-1 Bose-Einstein condensates
• Finite-temperature phase diagram and collective modes of coherently coupled Bose mixtures