(A) Phase diagram plotted based on transport measurement. The half filling states gradually disappear when temperature is higher than 40 K. (B) Displacement field effects (by setting V_TG at different voltages and scanning V_BG) on the full filling and half filling states. The full and half filling states behave differently by changing the displacement fields. The black/red thick dashed lines indicate the ideal full/half filling peak positions. The black thin dashed line indicates the peak positions of half filling states measured. (C) Temperature dependence of the resistance hysteresis. The hysteresis loops gradually disappear at about 40 K.