Journal
NANO LETTERS
Volume 14, Issue 5, Pages 2879-2883Publisher
AMER CHEMICAL SOC
DOI: 10.1021/nl5009212
Keywords
2D topological insulator; Dirac cone state; chemical edge modification; spin texture
Categories
Funding
- NSF-MRSEC [DMR-1121252]
- DOE-BES [DE-FG02-04ER46148]
- National Natural Science Foundation of China [10974076, 11274151, 11147007, 11204120]
- State Key Laboratory of Low-Dimensional Quantum Physics [20120924]
- Key Disciplines of Condensed Matter Physics of Linyi University
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Based on first-principles and tight-binding calculations, we report that the topological edge states of zigzag Bi(111) nanoribbon can be significantly tuned by H edge adsorption. The Fermi velocity is increased by 1 order of magnitude, as the Dirac point is moved from the Brillouin zone boundary to the Brillouin zone center, and the real-space distribution of Dirac states are made twice more delocalized. These intriguing changes are explained by an orbital filtering effect of edge H atoms, which pushes certain components of the p orbital of edge Bi atoms out of the band gap regime that reshapes the topological edge states. In addition, the spin texture of the Dirac states is also modified, which is described by introducing an effective Hamiltonian. Our findings not only are of fundamental interest but also have practical implications in potential applications of topological insulators.
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