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Title: Two-dimensional hexagonal M 3 C 2 (M = Zn, Cd and Hg) monolayers: novel quantum spin Hall insulators and Dirac cone materials

Journal Article · · Journal of Materials Chemistry C
DOI:https://doi.org/10.1039/C7TC02739G· OSTI ID:1505970
ORCiD logo [1]; ORCiD logo [2];  [2]; ORCiD logo [1]
  1. State Key Laboratory of Structural Chemistry; Fujian Institute of Research on the Structure of Matter; Chinese Academy of Sciences; Fuzhou; People's Republic of China
  2. Theoretical Division; Center for Nonlinear Studies and Center for Integrated Nanotechnologies; Los Alamos National Laboratory; Los Alamos; USA

The intriguing Dirac cones in honeycomb graphene have motivated the search for novel two-dimensional (2D) Dirac materials. Based on density functional theory and the global particle-swarm optimization method, herein, we predict a new family of 2D materials in honeycomb transition-metal carbides M3C2 (M = Zn, Cd and Hg) with intrinsic Dirac cones. The M3C2 monolayer is a kinetically stable state with a linear geometry (C=M=C), which to date has not been observed in other transition-metal-based 2D materials. The intrinsic Dirac cones in the Zn3C2, Cd3C2 and Hg3C2 monolayers arise from p–d band hybridizations. Importantly, the Hg3C2 monolayer is a room-temperature 2D topological insulator with a sizable energy gap of 44.3 meV. When an external strain is applied, additional phases with node-line semimetal states emerge in the M3C2 monolayer. These novel stable transition-metal–carbon-framework materials hold great promise for 2D electronic device applications.

Research Organization:
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Sponsoring Organization:
USDOE Laboratory Directed Research and Development (LDRD) Program
DOE Contract Number:
89233218CNA000001
OSTI ID:
1505970
Report Number(s):
LA-UR-17-23763; JMCCCX
Journal Information:
Journal of Materials Chemistry C, Vol. 5, Issue 35; ISSN 2050-7526
Publisher:
Royal Society of Chemistry
Country of Publication:
United States
Language:
English

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