Recent progresses on graphene-based artificial nanostructures: a perspective from scanning tunneling microscopy

Abstract

Graphene, a Dirac semimetal, exhibits the simplest lattice configuration and band structure in the world of two-dimensional materials. Due to its remarkable brevity and tunability, graphene becomes an ideal platform for studying the fundamental physics arising from the linear dispersion around the Dirac point, as well as for exploring symmetry-breaking orders in the flat band through playing with various artificial structures and external fields. In this review, we provide an overview of the nanoscale graphene model structures such as defects, quantum dots, strains, and superlattices in scanning tunneling microscopy measurements. Utilizing nanostructures in diverse dimensions, we present some behaviors of electrons near singularities of density of states from the perspective of scanning tunneling microscopy.

Magic-angle twisted bilayer graphene under orthogonal and in-plane magnetic fields

“…Therefore, increasing the number of layers will enhance the effect. Though not taking into account the electron-electron interaction, which is more relevant for high-quality samples and low temperatures, our results should be experimentally observable by measuring electronic transport [70] or density of states, for example using scanning tunneling microscopy [71].…”

Bimodal growth of Fe islands on graphene

“…[13] Other than pristine graphene, the hybrid systems of graphene and other materials may generate new possibilities. [14] One example is that properly doped graphene is theoretically predicted to possess d + i d superconductivity due to repulsive interactions. [15][16][17] This superconductivity has been experimentally demonstrated in Ca-intercalated bilayer graphene.…”