Fig. 4: Signatures of helical edge states transport in multiterminal and nonlocal measurements in the C = 0 phase.
From: Magnetic-field-induced robust zero Hall plateau state in MnBi2Te4 Chern insulator
a Magnetic field dependent Rxx and Ryx near the C = −1 to C = 0 phase transition for Vg = 2 V and 4 V. The spatial distribution of edge states in the magnetic field is displayed in the inset. b Two-terminal, three-terminal, and nonlocal measurements in various configurations. The inset shows the schematic layout of the experimental setup. The expected values for R2T and R3T are 2 h/e2 and 1/2 h/e2, as denoted by the broken lines in the top panels. Middle panel: nonlocal measurements with current flowing through electrodes 1 and 8. The convergence of all three curves near 1/8 h/e2 (denoted by the broken lines) indicates the helical edge transport at the onset of the C = 0 phase. Bottom panel: nonlocal measurements in another setup with current flowing through electrodes 1 and 7. Depending on the position of the voltage probes, the resistance values of 1/4 and 3/4 h/e2 are expected, which are confirmed by the experimental results.
