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- W2913247757 abstract "Recently, a honeycomb borophene was reported to grow successfully on Al(111) surface. Since the metallic $sigma$-bonding bands of honeycomb boron sheet play a crucial role in the 39 K superconductivity of MgB$_2$, it is physically interesting to examine whether similar property exists in this material. We have calculated the electronic structures and the electron-phonon coupling for honeycomb borophene by explicitly considering the substrate effect using first-principles density functional theory in conjunction with the Wannier interpolation technique. We find that the $sp^2$-hybridized $sigma$-bonding bands of honeycomb borophene are metallized due to moderate charge transfer from the Al substrate, similar as in MgB$_2$. However, the electron-phonon coupling in honeycomb borophene is much weaker than in MgB$_2$ due to the hardening of the bond-stretching boron phonon modes and the reduction of phonon density of states. Nevertheless, the interlayer coupling between Al-associated phonons and electrons in borophene is strong. Based on this observation, we predict that a 6.5 K superconducting transition can be observed in a free-standing borophene decorated by a single Al layer, namely monolayer AlB$_2$. Accordingly, similar superconducting transition temperature could be expected in honeycomb borophene on Al(111)." @default.
- W2913247757 created "2019-02-21" @default.
- W2913247757 creator A5042241049 @default.
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- W2913247757 date "2019-07-09" @default.
- W2913247757 modified "2023-10-16" @default.
- W2913247757 title "Electron-phonon coupling in a honeycomb borophene grown on Al(111) surface" @default.
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- W2913247757 doi "https://doi.org/10.1103/physrevb.100.024503" @default.
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