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Zeeman splitting for the first three subbands of the QPC. (a) Transconductance as a function of gate voltage (horizontal axis) and magnetic field (vertical axis). Regions of yellow and red correspond to a large amplitude of , indicating the locations of subband transitions. (b) Conductance vs gate voltage for (thick blue line) and 10 T (thin red line). Dashed lines in (a) indicate the region of the plot corresponding to the colored traces in (b).
Transconductance plotted as a function of gate voltage (horizontal axis) and source-drain bias (vertical axis) at . Regions of yellow and red correspond to a large amplitude of , indicating the locations of subband transitions. The conductance is labeled on each plateau in units of . Arrows indicate the plateaus that are linked to the 0.7 feature (Refs. 16 and 17). The blue dashed line indicates the region of the plot that is equivalent to the blue trace in Fig. 1(b).
Effective Landé -factor in the QPC as a function of 1D subband index . Dashed lines bound the range of previously measured for 2D systems (Refs. 5–8). Inset: Zeeman splitting plotted vs magnetic field . Linear fits are calculated between and are then extrapolated to .
Subband-dependent parameters of the QPC: subband spacing , subband splitting rates and , and effective Landé -factor .
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