1. School of Physics and Optoelectronic Engineering, Xidian University, Xi’an 710071, China 2. School of Microelectronics, Xidian University, Xi’an 710071, China 3. College of Physics and Optoelectronic Technology, Nonlinear Research Institute, Baoji University of Arts and Sciences, Baoji 721016, China 4. College of Chemistry and Chemical Engineering, Baoji University of Arts and Sciences, Baoji 721013, China
In this paper, we propose a novel hybrid sp-sp2 monoclinic carbon allotrope mC12. This allotrope is a promising light metallic material, the mechanical and electronic properties of which are studied based on first-principles calculations. The structure of this new mC12 is mechanically and dynamically stable at ambient pressure and has a low equilibrium density due to its large cell volume. Furthermore, calculations of the elastic constants and moduli reveal that mC12 has a rigid mechanical property. Finally, it exhibits metallic characteristics, owing to the mixture of sp-sp2 hybrid carbon atoms.
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