Abstract
Two-dimensional (2D) superconductors are important for both fundamental superconducting physics and potential nanoscale applications. Here, using first-principles calculations, we unravel that an Na-deposited InSe monolayer (NaIn2Se2) is dynamically stable and may constitute a novel 2D superconductor with a transition temperature (Tc) of 4.42 K due to the combined effect of strong Fermi nesting and strong electron-phonon coupling (EPC) from in-plane phonons. In contrast, Li- and Mg-deposited InSe monolayers are dynamically unstable. Furthermore, a 3% biaxial tensile strain increases the EPC strength of NaIn2Se2 and Tc is increased to 4.88 K. However, a 3% compressive strain slightly lowers Tc to 4.12 K. Our work demonstrates that Na-deposited InSe monolayer may be a novel 2D superconductor and that strain is important to maximize its Tc.
Published Version
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