Universal enhancement of superconductivity in two dimensional semiconductors at low doping by electron-electron interaction

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 (T${}_c$) and of the magnetic susceptibility measured in Li${}_x$ZrNCl. By finding the conditions for a maximal T${}_c$ enhancement, we show how weakly-doped two-dimensional semiconductors provide a route towards high T${}_c$ superconductivity.

arXiv comment5 Pages + Supplementary materials, 9 Pictures overall, to appear on Phys. Rev. Lett

References in corpus (15)

• Quantum ESPRESSO: a modular and open-source software project for quantum simulations of materials
• Two Dimensional Atomic Crystals
• Superconductivity in diamond
• Correlation energy and spin polarization in the 2D electron gas
• Valley susceptibility of an interacting two-dimensional electron system
• Dependence of the superconducting transition temperature on the doping level in single crystalline diamond films
• Adiabatic and non-adiabatic phonon dispersion in a Wannier function approach
• Correlation-enhanced electron-phonon coupling: Applications of GW and screened hybrid functional to bismuthates, chloronitrides, and other high Tc superconductors
• High-temperature Superconductivity in Layered Nitrides β-Li${}_x$MNCl (M = Ti, Zr, Hf): Insights from Density-functional Theory for Superconductors
• Dramatic Changes in the Electronic Structure Upon Transition to the Collapsed Tetragonal Phase in CaFe2As2
• Density dependent spin susceptibility and effective mass in interacting quasi-two dimensional electron systems
• Specific heat and electronic states of superconducting boron-doped silicon carbide
• First-Principles Study of Electronic and Vibrational Properties of BaHfN${}_2$
• Exchange instabilities in electron systems: Bloch versus Stoner Ferromagnetism
• Valley dependent many-body effects in 2D semiconductors

Cited by in corpus (10)

• EPW: Electron-phonon coupling, transport and superconducting properties using maximally localized Wannier functions
• Gate-controlled BCS-BEC crossover in a two-dimensional superconductor
• Critical role of the exchange interaction for the electronic structure and charge-density-wave formation in TiSe2
• Gate-controlled low carrier density superconductors: Toward the two-dimensional BCS-BEC crossover
• Revisiting the homogeneous electron gas in pursuit of the properly normed ab initio Eliashberg theory
• High-$T_c$ superconductivity in weakly electron-doped HfNCl
• Spin susceptibility and electron-phonon coupling of two-dimensional materials by range-separated hybrid density functionals: Case study of Li${}_x$ZrNCl
• Enhancement of Superconductivity upon reduction of carrier density in proximitized graphene
• Variational formulation of dynamical electronic response functions in presence of nonlocal exchange interactions
• Exchange Enhancement of the Electron-Phonon Interaction: the Case of Weakly Doped Two-Dimensional Multivalley Semiconductors