Extended Data Fig. 5: Comparison between 2-terminal and 4-terminal measurements.

a,b Schematic drawing of the 2-terminal and 4-terminal measurement set-ups, respectively. c, I–V measurements of the 2-terminal and 4-terminal configurations under different magnetic field directions. d, Magnetic-field-dependent tunnelling conductance determined from the 2-terminal and 4-terminal configurations at the bias of 0.1 V. 2T, 2-terminal; 4T, 4-terminal. Our 4-terminal and 2-terminal measurements essentially gave the same results, indicating negligible contribution from the contact resistance or the series resistance from the Cr₃Te₄ and H-TaS₂. Compared with the overall resistance of the CMIS junction (typically larger than 10 MΩ at 10 K), the contribution from the contact and series resistance is estimated to be only about 0.1% of the total measured resistance in the 2-terminal measurement and, thus, would not affect our interpretation.