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The surface of a topological crystalline insulator (TCI) carries an evennumber of Dirac cones protected by crystalline symmetry. We epitaxially grewhigh quality Pb$_{1-x}$Sn$_x$Te(111) films and investigated the TCI phase byin-situ angle-resolved photoemission spectroscopy. Pb$_{1-x}$Sn$_x$Te(111)films undergo a topological phase transition from trivial insulator to TCI viaincreasing the Sn/Pb ratio, accompanied by a crossover from n-type to p-typedoping. In addition, a hybridization gap is opened in the surface states whenthe thickness of film is reduced to the two-dimensional limit. The workdemonstrates an approach to manipulating the topological properties of TCI,which is of importance for future fundamental research and applications basedon TCI.

Experimental observation of Dirac-like surface states and topological phase transition in Pb$_{1-x}$Sn$_x$Te(111) films