Fig. 2
From: Conductance through a helical state in an Indium antimonide nanowire
Magnetic field dependence of the helical gap. a The nanowire lies in the x–y plane at an angle θ = 17° relative to the external magnetic field. b Differential conductance dI/dV at zero source-drain bias as a function of backgate voltage and external magnetic field. At low magnetic fields conductance plateaus at multiples of 0.5·G 0 are visible. Above B = 3 T, a re-entrant conductance feature at 0.5·G 0 appears in the 1·G 0 plateau. The feature evolves linearly with Zeeman energy indicated by dashed green lines. c Numerical simulations of the differential conductance as a function of the potential E a and external magnetic field for L = 325 nm, θ = 17° and l SO = 20 nm (Supplementary Note 1 and Supplementary Fig. 1 for a more detailed description of the model). In the numerical simulations, the conductance plateaus have a different slope compared to the experimental data as the calculations neglect screening by charges in the wire. d (Top) Sketch of the expected conductance together with the color scheme explained in Fig. 1 and (bottom) line traces of the conductance map in b taken at B = 3 T (green), B = 4.5 T (pink) and B = 5.5 T (brown). As the helical gap is independent of disorder or interference effects, these and other anomalous conductance features average out in a 2D colorplot improving the visibility of the helical gap in b compared to the individual traces in d
