By first principles calculations, we predict that the recently prepared borophene is a pristine two-dimensional monolayer superconductor in which the superconductivity can be significantly enhanced by strain and charge carrier doping. The intrinsic metallic ground state with high density of states at Fermi energy and strong Fermi surface nesting lead to sizeable electron-phonon coupling, making the freestanding borophene superconduct with Tc close to 19.0 K. The tensile strain can increase the Tc to 27.4 K, while the hole doping can notably increase Tc to 34.8 K. The results indicate that the borophene grown on substrates with large lattice parameters or under photoexcitation can show enhanced superconductivity with Tc far above the liquid hydrogen temperature of 20.3 K, which will largely broaden the applications of such promising material.
Enhanced superconductivity by strain and carrier-doping in borophene: A first principles prediction
R. C. Xiao, D. F. Shao, W. J. Lu, H. Y. Lv, J. Y. Li, Y. P. Sun; Enhanced superconductivity by strain and carrier-doping in borophene: A first principles prediction. Appl. Phys. Lett. 19 September 2016; 109 (12): 122604. https://doi.org/10.1063/1.4963179
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