Tunable band gap in twisted bilayer graphene

Unravelling the formation of carbyne nanocrystals from graphene nanoconstrictions through the hydrothermal treatment of agro-industrial waste molasses

“…Inspired by monolayer thick graphene, 1 the controlled synthesis of sp–sp 2 hybridized monolayer nanostructures acknowledging certain extra degree of freedom fetch paradigm shift towards new age 2D nanomaterials 2,3 that has attracted great attention among scientists. The ‘flat-and-twist’ nature of graphene moiré layers has several significant characteristic properties, including sizeable band gaps, 4 giant electron delocalization, 5 superconductivity, 6,7 interfacial charge transfer and surface reactivity. 8,9 More precisely, the presence of vital defects and edge sites acts as building blocks in the design of customizable 2D van der Waals (vdW) heteronanostructures via the deterministic assembly of multiple layers possessing weak interlayer interactions.…”

Phase transition from a nonmagnetic to a ferromagnetic state in a twisted bilayer graphene nanoflake: the role of electronic pressure on the magic-twist

“…The success in fine-tuning the rotational alignment between the layer in these structures during the synthesis to tune the IEC has made it possible to observe these exotic phases. For example, twisted bilayer graphene (BLG), a widely studied material, 1–48 has been reported to exhibit a variety of intriguing correlated states ranging from superconductivity 2–5,17,24,31,35,37,46 to ferromagnetism 13–15,30 at a small magic twist angle of ∼1°. The emergence of dispersionless energy minibands 7,8,18–23,26–29,33,34,47 in the vicinity of the Fermi energy at ∼1° in twisted BLG leads to complete suppression of the quasiparticle's kinetic energy in frontier states and enhancement of electron–electron interaction strength at the magic angle, which gives rise to these observed, strong IEC-driven correlated phases.…”