Dynamics in spinor condensates tuned by a microwave dressing field

摘要: We experimentally study spin dynamics in a sodium antiferromagnetic spinor condensate as result of spin-dependent interactions $c$ and microwave dressing field characterized by the net quadratic Zeeman effect ${q}_{\mathrm{net}}$. In contrast to magnetic fields, fields enable us access both negative positive values find an experimental signature determine sign ${q}_{\mathrm{net}}$ observe harmonic population oscillations at every except near each separatrix phase space where oscillation period diverges. No domains spatial modes are observed our system. Our data region exactly resembles what is predicted occur ferromagnetic region. This observation agrees with important prediction derived from mean-field theory: spin-1 condensates substantially depends on ${q}_{\mathrm{net}}/c$. work uses only one atomic species reveal dynamics, especially remarkably different relationship between magnetization, condensates.