Fig. 2: Unsupervised clustering by iEDCs (angle-integrated energy distribution curves) K-means algorithm.
a–c The images of the sample, obtained from an optical microscope, include scale bars represented by black lines to indicate the size: the whole sample, BN and MoS2 (monolayer (A) and multilayer (B)). d iEDCs of all scan points by summing up the number of photoelectrons in the angle (θ) dimension. h The SSE (Sum of Squared Errors) curve of cluster numbers from 1 to 10. e, i, l The spatial distribution results for n = 2, 3, 4, respectively. Different colors represent different phases. In Fig. 2e, the grey area labeled (1) corresponds to Au and the yellow area (2) represents BN and MoS2. In Fig. 2i, the grey area labeled (1) corresponds to Au, the yellow area (2) to BN and the orange area (3) represents MoS2. In Fig. 2l, the grey area labeled (1) corresponds to Au, the yellow area (2) to BN, the orange area (3) to MoS2, and the blue area (4) represents the combined signal from both sides of the edge. f, j, m The mean-EDCs obtained by averaging the cluster members in each cluster for n = 2, 3, 4, respectively. g, k, n The 2D ARPES (angle-resolved photoemission spectroscopy) images obtained by averaging the cluster members in each cluster for n = 2, 3, 4 cases, respectively.
