Extended Data Fig. 4: Background subtraction of Rxx.
From: High-mobility holes in gallium nitride and their quantum oscillations
a, Solid lines show the measured Rxx, from which a fifth-order polynomial background (dashed lines) is fitted. b, Subtracting out the polynomial background yields the combined light hole and heavy hole oscillations (curves offset for clarity). The combined oscillations are then fitted to the single-channel LK equation (black dashed lines) to obtain the LH oscillations which, when subtracted, reveal the HH oscillations shown in Fig. 2c. See Methods and Supplementary Fig. 1 for more details on background subtraction.
