 origin. To further corroborate, we also present in the Fig. 0(e) inset the Fourier transform (FT) spectrum of the oscillations observed in R pat . Note that, for an AlAs 0DES, there are two relevant k F for COs along the modulation direction of [000], each for the elliptical Fermi surfaces of the X and Y valley, k F , X and k F , Y , respectively; here k F , X 0 = 0 π n X ( m t / m l ) and k F , Y 0 = 0 π n Y ( m l / m t ) [00] . Based on the expression f CO = 0 ℏ k F / e a , and assuming the average densities of n X = n Y = n / 0 , we mark with green and red circles the expected CO frequencies for the X and Y valleys, respectively. The peaks in the FT spectrum closely agree with the expected COs