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Superconductivity of monolayer functionalized biphenylene with Dirac cones
Guo-Hua Liu1, Liu Yang1, Shu-Xiang Qiao1
1School of Physics and Physical Engineering, Qufu Normal University, Qufu 273165, China. hylu@qfnu.edu.cn.
Physical Chemistry Chemical Physics : PCCP
|January 10, 2023
Summary
Lithium adsorption significantly boosts superconductivity in 2D biphenylene, raising its critical temperature. Applying strain further enhances this effect, creating a promising new material for Dirac-type superconductors.
Area of Science:
- Condensed Matter Physics
- Materials Science
- Nanotechnology
Background:
- Monolayer biphenylene is a novel two-dimensional (2D) carbon allotrope.
- It has been experimentally synthesized and theoretically predicted to exhibit superconductivity.
Purpose of the Study:
- Investigate the effects of lithium (Li) adsorption on the superconducting properties of monolayer biphenylene.
- Explore the potential for enhancing superconductivity through strain engineering.
Main Methods:
- Density Functional Theory (DFT) calculations.
- Analysis of electronic density of states and phonon spectra.
- Simulations of Li adsorption and biaxial tensile strain effects.
Main Results:
- Lithium adsorption increased the superconducting critical temperature (Tc) from 0.59 K to 3.91 K.
- Adsorption shifted the electronic density of states peak closer to the Fermi level.
- Biaxial tensile strain further enhanced Tc to 15.86 K in Li-adsorbed biphenylene.
- Observed type-II Dirac cones below the Fermi level.
Conclusions:
- Li-adsorbed biphenylene exhibits significantly enhanced superconductivity.
- Strain engineering offers a pathway to further tune superconducting properties.
- The material expands the class of Dirac materials and shows potential for applications in superconductivity and electronics.
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