Fig. 1. Bistable generalized potential with different barrier heights.

Fig. 2. Time correlation function with different aspect ratios of energy barrier: (a) When , the correlation function presents single peak; when and time correlation length , the time correlation function tends to 1.3; (b) when , time correlation function increases with time correlation length exponentially, .

Fig. 3. (a) Dependence of relaxation time on aspect ratio of energy barrier under different noise intensities; (b) dependence of relaxation time on noise intensity under different aspect ratios of energy barrier.

Fig. 4. Dotted blue line shows the critical condition of , red circle line presents the critical condition .

Fig. 5. (a) Relaxation time depends linearly on noise intensity; (b) correlation coefficient depends linearly on aspect ratio of energy barrier.