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(a) Imin versus Imax at Vd = 0.3 V for devices grown intentionally without InAs shell (red circles) and devices with shell grown for 3 min (blue diamonds). Each point has the same gate-voltage sweep range. (b) Id − Vg at Vd = 0.05 and 0.3 V for a device with shell (blue circle) and grown intentionally without shell (red circle). The devices without shell provide a measure of the axial leakage across the GaAs barrier. Axial leakage is at least 100× less than the measured current.
