Comparison between Monolayer and Bilayer Graphene energy bands using the Tight Binding model

Menacho, Lucila; Carrasco, Mónica A.; Ayala, Z. B.

doi:10.1088/1742-6596/1143/1/012022

Cited by 6 publications

(5 citation statements)

References 5 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Meanwhile, this peak seems to vanish in the same region for SL-AGNRs. These consequences agree well with the alternations in the band structure of SL-AGNRs and BL-AGNRs and can be interpreted as the interlayer (van der Waals) interactions in BL-AGNRs result in the creation of extra subbands [45,50]. In other words, the number of optical peaks in the spectral function of BL-AGNRs is more remarkable than those of SL-AGNRs.…”

Section: Correlation Between the Absorption Spectra And The Electroni...supporting

confidence: 76%

“…In addition, the number of absorption peaks in BL-AGNRs is more outstanding than in SL-AGNRs. The physical explanation is that the energy structure in BL-AGNRs has a more remarkable number of subbands than in SL-AGNRs with the same value of M [45]. This outcome suggests that when increase in the number of layers to three or more, due to the increment in the number of subbands and the decrease in the gap size [46], it likely causes a significant variation in the absorption spectrum, i.e.…”

Section: Correlation Between the Absorption Spectra And The Electroni...mentioning

confidence: 99%

See 1 more Smart Citation

Correlation between energy band transition and optical absorption spectrum in bilayer armchair graphene nanoribbons

Nguyen

Ngo

Thái

et al. 2023

J. Phys.: Condens. Matter

View full text Add to dashboard Cite

In this work, we investigate the intrinsic as well as modulated optical properties of the AB-stacking bilayer in the absence and presence of external electric fields. Single-layer armchair graphene ribbons are also considered for comparison. By using a tight-binding model in combination with the gradient approximation, we examine the energy bands, the density of states as well as the absorption spectra. Our results demonstrate that when external fields are not present, the low-frequency optical absorption spectra display numerous peaks and they vanish at zero point. In addition, the number, the position, and the intensity of the absorption peaks are strongly associated with the ribbon width. With the wider ribbon width, more absorption peaks are present and a lower threshold absorption frequency is observed. Interestingly, in the presence of electric fields, bilayer armchair ribbons exhibit a lower threshold absorption frequency, more absorption peaks, and weaker spectral intensity. When increasing the strength of the electric field, the prominent peaks of the edge-dependent selection rules are lowered, and the sub-peaks satisfying the extra selection rules come to exist. The obtained results certainly provide a more comprehensive understanding of the correlation between the energy band transition and the optical absorption, in both single-layer and bilayer graphene armchair ribbons, and could provide new insights into developments of optoelectronic device applications based on graphene bilayer ribbons.

show abstract

Section: Correlation Between the Absorption Spectra And The Electroni...supporting

confidence: 76%

Section: Correlation Between the Absorption Spectra And The Electroni...mentioning

confidence: 99%

Correlation between energy band transition and optical absorption spectrum in bilayer armchair graphene nanoribbons

Nguyen

Ngo

Thái

et al. 2023

J. Phys.: Condens. Matter

View full text Add to dashboard Cite

show abstract

“…Note that because the number of SL graphene atoms is one‐half that of BL graphene atoms, the energy dispersions in the BL structure have twice the number of subbands in the SL structure. [ 60 ] However, both SL‐ZGNRs and BL‐ZGNRs exhibit a similar electronic structure; that is, the edge states (or flat bands) are around the Fermi level

E_{normalF} = 0

, where the charge distribution is mainly concentrated in the low‐energy region. The partial flat band states derived from the localization of electronic wave function (nonbonding orbital

2 p_{z}

) lie at the zero point of energy.…”

Section: Resultsmentioning

confidence: 99%

Electronic Properties of Single‐Layer and Bilayer Graphene Nanoribbons

Nguyen

Tran

et al. 2023

Physica Status Solidi (b)

View full text Add to dashboard Cite

Herein, a tight‐binding description is utilized to investigate electronic structures and density of states of single‐layer (SL) and bilayer (BL) graphene ribbons with and without the influence of external electric fields. Analyses are implemented to reveal the similarity and difference among electronic properties of three types of structures (specifically SL and BL ribbons with AA and AB stackings). Moreover, both armchair and zigzag edge orientations are considered. It is indicated in the results that variation in electronic properties of these structures in the presence of external electric fields depends on both structural form and edge orientation. The following two points are demonstrated: 1) a transverse field has a significant effect on adjusting bandgap of the zigzag configurations, whereas a vertical electric field has a distinct impact on energy bands of armchair edge structures, and 2) among considered structures, AB‐stacking BL ribbons are invariably the structures that are most strongly influenced by external fields. Interestingly, AB‐stacking BL ribbons are also capable of enlarging bandgap with both edge terminations. Herein, an insight into how the electronic structure and charge distribution of both SL and BL graphene nanoribbons can be controlled not only in armchair but also in zigzag edge terminations using electric stimulants is provided by the results.

show abstract

“…) where, 𝑎 ≈ 1.42 𝐴 ̇ (Menacho et al, 2018) However a single layer of it has atoms arranged in a hexagonal lattice Peres et al, 2009) nanostructure ( Poothanari et al, 2019). Due to its structural uniqueness, properties of the graphene is found to be very different and important and has been studied for it's wide range of applications, especially for carbon-based materials.…”

Section: Introductionmentioning

confidence: 99%

Structural Properties of Graphene

Shrestha,

Thapa,

Pandey

2023

Pragya Darshan

View full text Add to dashboard Cite

Graphene, a flat monolayer of carbon atoms tightly packed into a two-dimensional (2D) honeycomb lattice with six carbon atoms, are of two types due to their bonding. Due to its structural uniqueness, properties of the grapheme is found to be very different and important in application point of view. Hence, the authors have studied the structural properties as co-ordination number, coordinates, distances of nearest atoms from 1st to 5th, analytically using two dimensional coordinate system taking one atom of a unit cell at the origin. Furthermore, packing fraction is also calculated, as the property is very important to study absorption/adsorption of different atoms into the sheet of it.

show abstract

Comparison between Monolayer and Bilayer Graphene energy bands using the Tight Binding model

Cited by 6 publications

References 5 publications

Correlation between energy band transition and optical absorption spectrum in bilayer armchair graphene nanoribbons

Correlation between energy band transition and optical absorption spectrum in bilayer armchair graphene nanoribbons

Electronic Properties of Single‐Layer and Bilayer Graphene Nanoribbons

Structural Properties of Graphene

Contact Info

Product

Resources

About