Abstract
In two-dimensional multivalley semiconductors, at low doping, even a moderate electron-electron interaction enhances the response to any perturbation inducing a valley polarization. If the valley polarization is due to the electron-phonon coupling, the electron-electron interaction results in an enhancement of the superconducting critical temperature. By performing first-principles calculations beyond density functional theory, we prove that this effect accounts for the unconventional doping dependence of the superconducting transition temperature () and of the magnetic susceptibility measured in . Finally, we discuss what are the conditions for a maximal enhancement in weakly doped two-dimensional semiconductors.
- Received 26 August 2014
DOI:https://doi.org/10.1103/PhysRevLett.114.077001
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