Evidence of topological surface state in three-dimensional Dirac semimetal Cd3As2.

4b , although the signal is weak, there is an overall trend that, with the momentum cut moving along K y within the K x -K y basal plane (cuts B1 to B5 in Fig. 4c ), the cross point of the BV1 bulk band approaches the Fermi level at K y = 0 and sinks below the Fermi level when the momentum cut moves away from the Γ-K direction.

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