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(Color online) Differential conductance in units of as a function of gate voltage at various magnetic fields for . The inset shows a schematic cross section of the split-gate point contact.
(Color online) (a) Differential conductance at as a function of gate voltage at a magnetic field of . (b) Electron beam micrograph of split-gate structures. Only the center point contact, indicated by a dot, was used in the current study. (c) Contour plot of the differential conductance as a function of bias voltage and gate voltage at . The corresponding transconductance is shown as a color scale plot; the light yellow regions correspond to low transconductance regions (conductance plateaus) and the blue regions correspond to high transconductance regions. (d) Differential conductance as a function of at the center of the first (1) and second (2) plateaus.
(Color online) (a) Contour plot of the differential conductance at as a function of bias voltage and gate voltage . The corresponding transconductance is shown as a color scale plot (same scale as used in Fig. 2. (b) Corresponding plot for .
(Color online) Zeeman energy splitting as a function of magnetic field (dots). The full line corresponds to the calculated Zeeman splitting assuming a factor of 4.0. The inset illustrates the energy dispersion of the point contact.
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