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Superconductivity in gallenene

Superconductivity in gallenene Among the large variety of two-dimensional (2D) materials discovered to date, elemental monolayers that host superconductivity are very rare. Using ab initio calculations we show that recently synthesized gallium monolayers, coined gallenene, are intrinsically superconducting through electron–phonon coupling. We reveal that Ga-100 gallenene, a planar monolayer isostructural with graphene, is the structurally simplest 2D superconductor to date, furthermore hosting topological edge states due to its honeycomb structure. Our anisotropic Eliashberg calculations show distinctly three-gap superconductivity in Ga-100, in contrast to the alternative buckled Ga-010 gallenene which presents a single anisotropic superconducting gap. Strikingly, the critical temperature (Tc) of gallenene is in the range of 7–10 K, exceeding the Tcof bulk gallium from which it is exfoliated. Finally we explore chemical functionalization of gallenene with hydrogen, and report induced multigap superconductivity with an enhanced Tcin the resulting gallenane compound. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png 2D Materials IOP Publishing

Superconductivity in gallenene

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Publisher
IOP Publishing
Copyright
© 2021 IOP Publishing Ltd
eISSN
2053-1583
DOI
10.1088/2053-1583/ac0713
Publisher site
See Article on Publisher Site

Abstract

Among the large variety of two-dimensional (2D) materials discovered to date, elemental monolayers that host superconductivity are very rare. Using ab initio calculations we show that recently synthesized gallium monolayers, coined gallenene, are intrinsically superconducting through electron–phonon coupling. We reveal that Ga-100 gallenene, a planar monolayer isostructural with graphene, is the structurally simplest 2D superconductor to date, furthermore hosting topological edge states due to its honeycomb structure. Our anisotropic Eliashberg calculations show distinctly three-gap superconductivity in Ga-100, in contrast to the alternative buckled Ga-010 gallenene which presents a single anisotropic superconducting gap. Strikingly, the critical temperature (Tc) of gallenene is in the range of 7–10 K, exceeding the Tcof bulk gallium from which it is exfoliated. Finally we explore chemical functionalization of gallenene with hydrogen, and report induced multigap superconductivity with an enhanced Tcin the resulting gallenane compound.

Journal

2D MaterialsIOP Publishing

Published: Jul 1, 2021

Keywords: superconductivity; electron–phonon coupling; Eliashberg theory; density functional theory; hydrogenated materials; topological states; elemental 2D materials

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