The present paper discusses the band structure of graphene based on the rectangular 4-atom unit cell model to establish an appropriate k-vector for the Bloch electron dynamics. To obtain the band energy of a Bloch electron in graphene, we extend the tight-binding calculations for the Wigner-...
Researchers have used a specially crafted electric potential to manipulate the electronic band structure of graphene, laying the groundwork for on-demand electronic band design. Scientists have long been trying to tune the electronic band structures of materials so that those materials exhibit desired p...
The results of ab initio study of the opportunities for tuning the band structure, magnetic and transport properties of graphene materials on semiconductor substrates by transverse electric field (Eext) are present. This study was performed within the framework of the density functional theory (DFT)...
The Dirac band structure of graphene1,2has endowed this atomically thin two-dimensional material with exceptional optical and transport properties. As a scale-invariant host of chiral carriers3, graphene exhibits a universal optical response in absorption, with a single sheet capable of absorbing ~2.3...
Bernal bilayer graphene (BLG) offers a highly flexible platform for tuning the band structure, featuring two distinct regimes. One is a tunable band gap induced by large displacement fields. Another is a gapless metallic band occurring at low fields, featuring rich fine structure consisting of four...
The G band of monolayer graphene can be observed clearly at ~1590 cm−1. No perceptible D band (~1350 cm−1) indicates that the graphene has few defects. Moreover, compared with FePc/MLG/Si, the G band of MLG/FePc/Si has a slight shift from 1595 to 1588 cm−1, indicating ...
Raman spectroscopy is a fast and non-destructive technique for the structural investigation of carbon nanomaterials, specifically for determining defects and ordered/disordered structure of graphene. The intensity ratios of the D-band to the G-band (ID/IG) are generally accepted as representative of ...
The graphene-like features in the electronic structure arise from electronic states with coexisting honeycomb and Kagome symmetries. As a result, a flat energy band appears in the middle of the Dirac cone, which itself has been relocated at the Γ-point in reciprocal space. A necessary ...
Graphene is a rapidly rising star on the horizon of materials science and condensed-matter physics. This strictly two-dimensional material exhibits exceptionally high crystal and electronic quality, and, despite its short history, has already revealed a
In fact, it has been shown that graphene mobility, when deposited on hBN8, is dramatically improved as compared to those on SiO2 substrates9. Furthermore, the large band gap of hBN has the advantage of having little interaction between the states of hBN and graphene that is opposite to the...