Carbon Kagome lattice and orbital frustration-induced metal-insulator transition for optoelectronics

Abstract

A three-dimensional elemental carbon Kagome lattice (CKL), made of only fourfold coordinated carbon atoms, is proposed based on first-principles calculations. Despite the existence of 60° bond angles in the triangle rings, widely perceived to be energetically unfavorable, the CKL is found to display exceptional stability comparable to that of C60. The system allows us to study the effects of triangular frustration on the electronic properties of realistic solids, and it demonstrates a metal-insulator transition from that of graphene to a direct gap semiconductor in the visible blue region. By minimizing s-p orbital hybridization, which is an intrinsic property of carbon, not only the band edge states become nearly purely frustrated p states, but also the band structure is qualitatively different from any known bulk elemental semiconductors. For example, the optical properties are similar to those of direct-gap semiconductors GaN and ZnO, whereas the effective masses are comparable or smaller than those of Si.

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• Three-dimensional Pentagon Carbon with a genesis of emergent fermions
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• Electron and phonon properties and gas storage in carbon honeycomb
• Semi-Dirac Semimetal in Silicene Oxide
• Double Kagome bands in a two-dimensional phosphorus carbide P2C3
• Three-dimensional graphene networks modified with acetylenic linkages for high-performance optoelectronics and Li-ion battery anode material
• Grapheayne: a class of low-energy carbon allotropes with diverse optoelectronic and topological properties
• Interlocking nodal chains and their examples in carbon networks
• Coexistence of flat bands and Dirac bands in a carbon-Kagome-lattice family
• 2D clathrate graphene in minimum egg-tray-shape: An \textit{ab initio} study