Observation of resonant symmetry lifting by an effective bias field in a parametrically modulated atomic trap

Yonghee Kim, Myoung-Sun Heo, Geol Moon, Ji-Hyoun Kim, Heung-Ryoul Noh and Wonho Jhe, ”Observation of resonant symmetry lifting by an effective bias field in a parametrically modulated atomic trap”, Phys. Rev. A 82 (6), 063407 (2010)