English: The schematic is an illustration of the edge states in typical 2D material. The energy profile shows a positive value (E>0) for the conduction band and a negative value (E<0) for the valence band. In addition, there are states with zero energy values (E=0)called edge states.
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Schematic for illustration of edge states in typical two-dimensional material. The onduction band (CB), edge states (ES) and valance band (VB) are charcterized by postive, zero and negative energy eigenvalues..