Jiacheng Ye1, Jun Li2*, DingYong Zhong1, and Dao-Xin Yao1,3*
1State Key Laboratory of Optoelectronic Materials and Technologies, Guangdong Provincial Key Laboratory of Magnetoelectric Physics and Devices, School of Physics, Sun Yat-Sen University, Guangzhou 510275, China 2Key Laboratory for Microstructural Material Physics of Hebei Province, School of Science, Yanshan University, Qinhuangdao 066004, China 3International Quantum Academy, Shenzhen 518048, China
Abstract：A new two-dimensional allotrope of carbon known as biphenylene has been synthesized. Building on previous research investigating the superconductivity of octagraphene with a square-octagon structure, we conduct a systematic study on possible superconductivity of biphenylene with partial square-octagon structure. First-principle calculations are used to fit the tight-binding model of the material and to estimate its superconductivity. We find that the conventional superconducting transition temperature $T_{\rm c}$ based on electron-phonon interaction is 3.02 K, while the unconventional $T_{\rm c}$ primarily caused by spin fluctuation is 1.7 K. We hypothesize that the remaining hexagonal $C_6$ structure of biphenylene may not be conducive to the formation of perfect Fermi nesting, leading to a lower $T_{\rm c}$. The superconducting properties of this material fall between those of graphene and octagraphene, and it lays a foundation for achieving high-temperature superconductivity in carbon-based materials.
. [J]. 中国物理快报, 2023, 40(7): 77401-.
Jiacheng Ye, Jun Li, DingYong Zhong, and Dao-Xin Yao. Possible Superconductivity in Biphenylene. Chin. Phys. Lett., 2023, 40(7): 77401-.
2023, Vol. 40 
