Fig. 2: Detection of chiral edge states at the Chern junction.

a–d A bias current of 2 nA is injected at contact 1 (source) and the drain current is measured at contacts 8 (black) and 9 (red) with other contacts floating. a Schematics for current flow through edge states at µ₀H = −12 T when C_I = 1 and C_II = 2. b Drain current normalized to the total current as a function of back gate voltage V_bg for contacts 8 and 9. Yellow shaded area denotes the gate range where Chern insulator junction forms and functions as a 1:1 current divider. c Same measurement as shown in (b) but performed at µ₀H = 12 T, and (d) is the corresponding edge current flow diagram. e–h Similar as (a–d) but with the bias current injected at contact 9 (source) and the drain current measured at contacts 8 (black) and 10 (blue) with other contacts floating. e Schematics for current flow through edge states at µ₀H = −12 T when C_I = 1 and C_II = 2. f Drain current normalized to the total current versus V_bg for contacts 8 and 10. g Same measurement as shown in (f) but at µ₀H = 12 T, and (h) is the corresponding edge current flow schematics. Red circular arrow denotes the chirality of the edge state, which is clockwise for negative magnetic field (a and e) and counterclockwise for positive field (d and h).