Experimental Observation of Dirac-like Surface States and Topological Phase Transition in Pb1-xSnxTe ( 111 ) Films
The surface of a topological crystalline insulator (TCI) carries an even number of Dirac cones protected by crystalline symmetry. We epitaxially grew here high-quality ${\mathrm{Pb}}_{1{-}x}{\mathrm{Sn}}_{x}\mathrm{Te}(111)$ films and investigated the TCI phase by in situ angle-resolved photoemissio...
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| Veröffentlicht in: | Physical review letters 2014-05, Vol.112 (18) |
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| creator | Yan, Chenhui Liu, Junwei Zang, Yunyi Wang, Jianfeng Wang, Zhenyu Wang, Peng Zhang, Zhi-Dong Wang, Lili Ma, Xucun Ji, Shuaihua He, Ke Fu, Liang Duan, Wenhui Xue, Qi-Kun Chen, Xi |
| description | The surface of a topological crystalline insulator (TCI) carries an even number of Dirac cones protected by crystalline symmetry. We epitaxially grew here high-quality ${\mathrm{Pb}}_{1{-}x}{\mathrm{Sn}}_{x}\mathrm{Te}(111)$ films and investigated the TCI phase by in situ angle-resolved photoemission spectroscopy. ${\mathrm{Pb}}_{1{-}x}{\mathrm{Sn}}_{x}\mathrm{Te}(111)$ 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. |
| doi_str_mv | 10.1103/PhysRevLett.112.186801 |
| format | Article |
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We epitaxially grew here high-quality ${\mathrm{Pb}}_{1{-}x}{\mathrm{Sn}}_{x}\mathrm{Te}(111)$ films and investigated the TCI phase by in situ angle-resolved photoemission spectroscopy. ${\mathrm{Pb}}_{1{-}x}{\mathrm{Sn}}_{x}\mathrm{Te}(111)$ 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. 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| title | Experimental Observation of Dirac-like Surface States and Topological Phase Transition in Pb1-xSnxTe ( 111 ) Films |
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