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Two-dimensional topological insulators of Pb/Sb honeycombs on a Ge(111) semiconductor surface
- Source :
- RSC advances. 8(61)
- Publication Year :
- 2018
-
Abstract
- Based on first-principles hybrid functional calculations, we demonstrate the formation of two-dimensional (2D) topological insulators (TIs) of Pb/Sb honeycombs on Ge(111) semiconductor surface. We show that 1/3 Cl-covered Ge(111) surface offers an ideal template for metal deposition. When Pb and Sb atoms are deposited on Cl–Ge(111) surface, they spontaneously form a hexagonal lattice (Pb/Sb@Cl–Ge(111)). The Pb/Sb@Cl–Ge(111) exhibits a 2D TI state with large bulk gap of 0.27 eV for Pb@Cl–Ge(111) and 0.81 eV for Sb@Cl–Ge(111). The mechanism of 2D TI state is the substrate orbital-filtering effect that effectively removes the pz bands of Pb(Sb) away from the Fermi level, leaving behind only the px and py orbitals at the Fermi level. Our findings pave another way for future design of 2D topological insulators on conventional semiconductor surface, which promotes the application of 2D TIs in spintronics and quantum computing devices at room-temperature.
- Subjects :
- Materials science
Condensed matter physics
Spintronics
business.industry
General Chemical Engineering
Fermi level
02 engineering and technology
General Chemistry
Substrate (electronics)
021001 nanoscience & nanotechnology
01 natural sciences
Hybrid functional
symbols.namesake
Semiconductor
Atomic orbital
Topological insulator
0103 physical sciences
symbols
Hexagonal lattice
010306 general physics
0210 nano-technology
business
Subjects
Details
- ISSN :
- 20462069
- Volume :
- 8
- Issue :
- 61
- Database :
- OpenAIRE
- Journal :
- RSC advances
- Accession number :
- edsair.doi.dedup.....8c736dd0687d7f1713c93c67e760583e