title: Scaling of thermal hysteretic behavior in a parametrically modulated cold atomic system.
abstract: We observe the hysteresis of a spontaneous symmetry breaking (SSB) transition in a parametrically modulated magneto-optical trap by sweeping the total number of atoms and study thermal hysteretic behavior in the system by measuring the scaling exponent of hysteresis. It is shown that the relaxation time of the order parameter in the SSB transition becomes larger near the critical number. The scaling exponent of the hysteresis area with number sweeping rate is found to be 0.64±0.04, which is consistent with the value in the mean-field model.
authors.affiliation: Department of Physics and Astronomy, Seoul National University, Seoul 08826, Republic of Korea.
authors.forename: Wanhee
authors.initials: W
authors.lastname: Lee
authors.affiliation: Department of Physics and Astronomy, Seoul National University, Seoul 08826, Republic of Korea.
authors.forename: Ji-Hyoun
authors.initials: JH
authors.lastname: Kim
authors.affiliation: Department of Physics and Astronomy, Seoul National University, Seoul 08826, Republic of Korea.
authors.forename: Jong Geun
authors.initials: JG
authors.lastname: Hwang
authors.affiliation: Department of Physics, Chonnam National University, Gwangju 61186, Republic of Korea.
authors.forename: Heung-Ryoul
authors.initials: HR
authors.lastname: Noh
authors.affiliation: Department of Physics and Astronomy, Seoul National University, Seoul 08826, Republic of Korea.
authors.forename: Wonho
authors.initials: W
authors.lastname: Jhe