中国物理B ›› 2025, Vol. 34 ›› Issue (4): 47104-047104.doi: 10.1088/1674-1056/adb94d
Strain-modulated superconductivity of monolayer Tc2B2
Zhengtao Liu(刘正涛)1, Zihan Zhang(张子涵)1, Hao Song(宋昊)2, Tian Cui(崔田)2,1, and Defang Duan(段德芳)1,†
- 1 Key Laboratory of Material Simulation Methods & Software of Ministry of Education, State Key Laboratory of Superhard Materials, College of Physics, Jilin University, Changchun 130012, China;
2 Institute of High Pressure Physics, School of Physical Science and Technology, Ningbo University, Ningbo 315211, China
Strain-modulated superconductivity of monolayer Tc2B2
Zhengtao Liu(刘正涛)1, Zihan Zhang(张子涵)1, Hao Song(宋昊)2, Tian Cui(崔田)2,1, and Defang Duan(段德芳)1,†
- 1 Key Laboratory of Material Simulation Methods & Software of Ministry of Education, State Key Laboratory of Superhard Materials, College of Physics, Jilin University, Changchun 130012, China;
2 Institute of High Pressure Physics, School of Physical Science and Technology, Ningbo University, Ningbo 315211, China
摘要： Two-dimensional (2D) superconductors have attracted significant research interest due to their promising potential applications in optoelectronic and microelectronic devices. Herein, we employ first-principles calculations to predicted a new 2D conventional superconductor, Tc$_{2}$B$_{2}$, demonstrating its stable structural configuration. Remarkably, under biaxial strain, the superconducting transition temperature ($T_{\rm c}$) of Tc$_{2}$B$_{2}$ demonstrates a significant enhancement, achieving 19.5 K under 3% compressive strain and 9.2 K under 11% tensile strain. Our study reveals that strain-induced modifications in Fermi surface topology significantly enhance the Fermi surface nesting effect, which amplifies electron-phonon coupling interactions and consequently elevates $T_{\rm c}$. Additionally, the presence of the Lifshitz transition results in a more pronounced rise in $T_{\rm c}$ under compressive strain compared to tensile strain. These insights offer important theoretical guidance for designing 2D superconductors with high-$T_{\rm c}$ through strain modulation.
中图分类号: (Density functional theory, local density approximation, gradient and other corrections)
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