Fig. 2. (a) The conductance through the device measured as a function of external magnetic fields (blue trace). The AB oscillation was observed over a slowly varying background (red trace) as a function of the magnetic fields. To extract only the AB oscillation data, a smooth background (red trace) is subtracted from the measured data (blue trace). (b) The result after subtraction. (c) The frequencies of the AB oscillations obtained by the fast Fourier transformation (FFT) of the measured data.
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