Experimental Observation of Dirac-like Surface States and Topological Phase Transition in Pb[subscript 1-x]Sn[subscript x]Te(111) Films
The surface of a topological crystalline insulator (TCI) carries an even number of Dirac cones protected by crystalline symmetry. We epitaxially grew high-quality Pb[subscript 1−x]Sn[subscript x]Te(111) films and investigated the TCI phase by in situ angle-resolved photoemission spectroscopy. Pb[sub...
| Main Authors: | , , , , , , , , , , , , , , |
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| Other Authors: | |
| Format: | Article |
| Language: | English |
| Published: |
American Physical Society
2014
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| Online Access: | http://hdl.handle.net/1721.1/88618 https://orcid.org/0000-0002-8803-1017 |
| Summary: | The surface of a topological crystalline insulator (TCI) carries an even number of Dirac cones protected by crystalline symmetry. We epitaxially grew high-quality Pb[subscript 1−x]Sn[subscript x]Te(111) films and investigated the TCI phase by in situ angle-resolved photoemission spectroscopy. Pb[subscript 1−x]Sn[subscript x]Te(111) films undergo a topological phase transition from a trivial insulator to TCI via increasing the Sn/Pb ratio, accompanied by a crossover from n-type to p-type doping. In addition, a hybridization gap is opened in the surface states when the thickness of the film is reduced to the two-dimensional limit. The work demonstrates an approach to manipulating the topological properties of TCI, which is of importance for future fundamental research and applications based on TCI. |
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