Figure 4

(a) SIM pattern: curves of R_s(B) at different temperatures for V= −5 V. Note the crossing point at 810 mT that defines the quantum critical point (QCP) with (B_c = 810 mT, R_c = 1297.54 Ω). The inset shows the bi-value curve obtained by collapse of the date by finite-size scaling analysis. (b) Curves of R_s(T) at different magnetic fields B and for V_G = −5 V. Dashed line shows a plateau corresponding to QCP. Continuous lines are guide for the eyes.