Micrometre-scale single-crystalline borophene on a square-lattice Cu(100) surface
- Yale Univ., New Haven, CT (United States); Yale Univ., New Haven, CT (United States). Energy Sciences Inst.
- Yale Univ., New Haven, CT (United States)
- Brookhaven National Lab. (BNL), Upton, NY (United States)
- Yale Univ., New Haven, CT (United States). Energy Sciences Inst.; Yale Univ., New Haven, CT (United States)
- Yale Univ., New Haven, CT (United States); Yale Univ., New Haven, CT (United States). Energy Sciences Inst.; Brookhaven National Lab. (BNL), Upton, NY (United States)
Borophene, a crystalline monolayer boron sheet, is a new two-dimensional (2D) quantum material, predicted to feature tunable structure, intriguing physics and to find applications in flexible electronics, energy storage and catalysis. Nanoscale borophene flakes have been synthesized on noble-metal surfaces, but for device fabrication, one needs large single-crystal domains. In this work, we report the synthesis of borophene on a square lattice Cu(100) surface and show that incommensurate coordinations could reduce the borophene-substrate interactions and alter the borophene structures in interesting ways. Micrometer-scale single-crystal domains can form as isolated faceted islands or merge together to achieve full monolayer coverage. We have discovered a new crystal structure of borophene, with ten boron atoms and two hexagonal vacancies in the unit cell. First-principle calculations indicate that charge transfer rather than covalent bonding binds 2D boron to the copper surface, and confirm its integrity and uniformity The electronic band structure features multiple anisotropic tilted Dirac cones, heralding emergent quantum fermions.
- Research Organization:
- Brookhaven National Lab. (BNL), Upton, NY (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC), Basic Energy Sciences (BES); Gordon and Betty Moore Foundation; National Science Foundation (NSF)
- Grant/Contract Number:
- SC0012704; GBMF9074; DGE-1752134; ACI-1548562
- OSTI ID:
- 1839210
- Report Number(s):
- BNL-222571-2021-JAAM; TRN: US2301061
- Journal Information:
- Nature Chemistry, Vol. 14, Issue 4; ISSN 1755-4330
- Publisher:
- Nature Publishing GroupCopyright Statement
- Country of Publication:
- United States
- Language:
- English
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