Fig. 4: Transport and magnetic properties tuned by V_g.

a, b μ₀H-dependent σ_xy and σ_xx at the CNP for device #16 at various Ts. The hysteresis and the double peak in σ_xx disappear at around T = 21 K. The black triangles mark the position of H_c at different Ts. c H_c extracted from the field sweep data as a function of T at varied V_gs. The solid squares are the data points. The black lines are the data fittings in the form of ~(1 − T/T_N)^β. The red dashed lines represent the position of H_c = 0 for each curve. d Summarized T_N and β from the fittings as a function of V_g. The blue and red dashed lines represent the average positions of the β and T_N values for different V_gs. T_N and β are found to be ~21.2 K and 0.52, respectively, both of which are independent of V_g. e Colormap of σ_xy in the parameter space of μ₀H and V_g. The boundary between blue and orange region marks the V_g-independent H_c.