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. 2017 Feb 10;8:14468. doi: 10.1038/ncomms14468

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(a–h) The evolution of the ARPES dispersion as the surface carrier density increases from n_2D≈1.8 × 10¹³–6.0 × 10¹³ cm⁻². The red curve marks the replica band in a, while the yellow curve marks quantum well subband in h. The upper part of each panel shows the second energy derivative of the lower part in the −100 meV ≤E-E_F≤0 energy window. (i) EDCs of the main band and replica band as the carrier increases from n_2D≈1.8 × 10¹³–6.0 × 10¹³ cm⁻². The dashed red line marked the positon of replica band.