Strain-modulated superconductivity of monolayer Tc_(2)B_(2)  

作　　者：Zhengtao Liu Zihan Zhang Hao Song Tian Cui Defang Duan 刘正涛;张子涵;宋昊;崔田;段德芳

机构地区：[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

出　　处：《Chinese Physics B》2025年第4期221-227,共7页中国物理B(英文版)

基　　金：Project supported by the National Natural Science Foundation of China(Grant Nos.12274169,12122405,and 52072188);the National Key Research and Development Program of China(Grant No.2022YFA1402304);the Program for Science and Technology Innovation Team in Zhejiang Province,China(Grant No.2021R01004);the Fundamental Research Funds for the Central Universities.

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_(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 Tc.Additionally,the presence of the Lifshitz transition results in a more pronounced rise in Tc under compressive strain compared to tensile strain.These insights offer important theoretical guidance for designing 2D superconductors with high-Tc through strain modulation.

关 键 词：TWO-DIMENSIONAL SUPERCONDUCTIVITY strain modulation first-principles calculation 

分 类 号：O469[理学—凝聚态物理]