Superlattices Consisting of "Lines" of Adsorbed Hydrogen Atom Pairs on Graphene

TL;DR

This paper theoretically explores new hydrogen-adsorbed superlattices on graphene, revealing their electronic structures and similarities to carbon nanotubes, with potential applications in nanoscale devices.

Contribution

It introduces novel superlattice structures formed by hydrogen pairs on graphene and analyzes their electronic properties, highlighting their similarities to nanotube spectra.

Findings

Superlattices of (n, 0) type resemble (n, 0) nanotubes in band structure.

(n, n) superlattices are metallic with high density of states at Fermi level.

Spectral features exhibit Van Hove singularities characteristic of each superlattice.

Abstract

The structures and electron properties of new superlattices formed on graphene by adsorbed hydrogen molecules are theoretically described. It has been shown that superlattices of the (n, 0) zigzag type with linearly arranged pairs of H atoms have band structures similar to the spectra of (n, 0) carbon nanotubes. At the same time, superlattices of the (n, n) type with a "staircase" of adsorbed pairs of H atoms are substantially metallic with a high density of electronic states at the Fermi level and this property distinguishes their spectra from the spectra of the corresponding (n, n) nanotubes. The features of the spectra have the Van Hove form, which is characteristic of each individual superlattice. The possibility of using such planar structures with nanometer thickness is discussed.