Strain enhanced superconductivity of MoX2 (X=S or Se) bilayers with Na intercalation
Abstract
MoX2 (X=S or Se) is a semiconductor family with two-dimensional structure. And a recent calculation predicted the superconductivity in electron doped MoS2 monolayer. In this work, the electronic structure and lattice dynamics of MoX2 bilayers with monolayer Na intercalated, have been calculated. According to the electron-phonon interaction, it is predicted that these bilayers can be transformed from indirect-gap semiconductors to a superconductors by Na intercalation. More interestingly, the biaxial tensile strain can significantly enhance the superconducting temperature up to 10 K in Na-intercalated MoS2. In addition, the phonon mean free path at room-temperature is also greatly improved in Na intercalated MoSe2, which is advantaged for related applications.
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