Abstract
Spinor condensates immersed in a microwave dressing field, which access both negative and positive values of the net quadratic Zeeman effect, have been realized in a recent experiment. In this report, we study the ground state properties of a spinor condensate with a microwave dressing field which enables us to access both negative and positive values of quadratic Zeeman energy. The ground state exhibits three different phases by varying the magnetization and the net quadratic Zeeman energy for both cases of ferromagnetic and antiferromagnetic interactions. We investigate the atomic-number fluctuations of the ground state and show that the hyperfine state displays super-Poissonian and sub-Poissonian distributions in the different phases. We also discuss the dynamical properties and show that the separatrix has a remarkable relation to the magnetization.
Highlights
Spinor condensates immersed in a microwave dressing field, which access both negative and positive values of the net quadratic Zeeman effect, have been realized in a recent experiment
The quantum phase transition in the spinor condensates with antiferromagnetic interactions have been investigated by adiabatically tuning the microwave field[40]
It is found that the hyperfine state of mF = 0 exhibits super-Poissonian distributions in the AFM phase for both ferromagnetic and antiferromagnetic interactions, while sub-Poissonian distributions are presented in the broken axis symmetry phase (BA) phase
Summary
Spinor condensates immersed in a microwave dressing field, which access both negative and positive values of the net quadratic Zeeman effect, have been realized in a recent experiment. For spin-1 condensate, the magnetic field can only introduce a positive net quadratic Zeeman energy where δnet ∝ B2 > 0 . We study the ground state properties of a spin-1 condensate with a microwave dressing field where both negative and positive values of δnet can be accessed.
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