期刊
SCIENCE
卷 354, 期 6317, 页码 1269-1273出版社
AMER ASSOC ADVANCEMENT SCIENCE
DOI: 10.1126/science.aah6233
关键词
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资金
- DFG [SFB 1170]
- Polish National Science Centre NCN [2014/15/B/ST3/03833, 2012/07/B/ST3/03607]
- European Research Council (ERC) [ERC-StG-TOPOLECTRICS-Thomale-336012]
- Gauss Centre for Supercomputing e.V.
Topological crystalline insulators are materials in which the crystalline symmetry leads to topologically protected surface states with a chiral spin texture, rendering them potential candidates for spintronics applications. Using scanning tunneling spectroscopy, we uncover the existence of one-dimensional (1D) midgap states at odd-atomic surface step edges of the three-dimensional topological crystalline insulator (Pb,Sn)Se. A minimal toy model and realistic tight-binding calculations identify them as spin-polarized flat bands connecting two Dirac points. This nontrivial origin provides the 1D midgap states with inherent stability and protects them from backscattering. We experimentally show that this stability results in a striking robustness to defects, strong magnetic fields, and elevated temperature.
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