scholarly journals Topological edge states on time-periodically strained armchair graphene nanoribbons

2017 ◽  
Vol 96 (15) ◽  
Author(s):  
Pedro Roman-Taboada ◽  
Gerardo G. Naumis
Keyword(s):  
Graphene Nanoribbons ◽  
Edge States ◽  
Armchair Graphene Nanoribbons ◽  
Armchair Graphene

scholarly journals Helical edge states and edge-state transport in strained armchair graphene nanoribbons

2017 ◽  
Vol 7 (1) ◽  
Author(s):  
Zheng-Fang Liu ◽  
Qing-Ping Wu ◽  
Ai-Xi Chen ◽  
Xian-Bo Xiao ◽  
Nian-Hua Liu ◽  
...  
Keyword(s):  
Graphene Nanoribbons ◽  
Edge State ◽  
Edge States ◽  
Armchair Graphene Nanoribbons ◽  
Armchair Graphene

scholarly journals Role Played by Edge-Defects in the Optical Properties of Armchair Graphene Nanoribbons

Nanomaterials ◽  
2021 ◽  
Vol 11 (12) ◽  
pp. 3229
Author(s):  
Thi-Nga Do ◽  
Godfrey Gumbs ◽  
Danhong Huang ◽  
Bui D. Hoi ◽  
Po-Hsin Shih
Keyword(s):  
Optical Properties ◽  
Graphene Nanoribbons ◽  
Tight Binding ◽  
Edge States ◽  
Binding Model ◽  
Edge Defect ◽  
Flat Bands ◽  
Edge Defects ◽  
Armchair Graphene Nanoribbons ◽  
Armchair Graphene

We explore the implementation of specific optical properties of armchair graphene nanoribbons (AGNRs) through edge-defect manipulation. This technique employs the tight-binding model in conjunction with the calculated absorption spectral function. Modification of the edge states gives rise to the diverse electronic structures with striking changes in the band gap and special flat bands at low energy. The optical-absorption spectra exhibit unique excitation peaks, and they strongly depend on the type and period of the edge extension. Remarkably, there exist the unusual transition channels associated with the flat bands for selected edge-modified systems. We discovered the special rule governing how the edge-defect influences the electronic and optical properties in AGNRs. Our theoretical prediction demonstrates an efficient way to manipulate the optical properties of AGNRs. This might be of importance in the search for suitable materials designed to have possible technology applications in nano-optical, plasmonic and optoelectronic devices.

scholarly journals Role Played by Edge-Defects in the Optical Properties of Armchair Graphene Nanoribbons

2021 ◽  
Author(s):  
Thi-Nga Do ◽  
Godfrey Gumbs ◽  
Danhong Huang ◽  
D. Hoi Bui ◽  
Po-Hsin Shih
Keyword(s):  
Optical Properties ◽  
Graphene Nanoribbons ◽  
Tight Binding ◽  
Edge States ◽  
Binding Model ◽  
Edge Defect ◽  
Flat Bands ◽  
Edge Defects ◽  
Armchair Graphene Nanoribbons ◽  
Armchair Graphene

We explore the implementation of specific optical properties of armchair graphene nanoribbons (AGNRs) through edge-defect manipulation. This technique employs the tight-binding model in conjunction with the calculated absorption spectral function. Modification of the edge states gives rise to the diverse electronic structures with striking changes in the band gap and special flat bands at low energy. The optical-absorption spectra exhibit exotic excitation peaks and they strongly depend on the type and period of the edge extension. Remarkably, there exist the unusual transition channels associated with the flat bands for selected edge-modified systems. We discover the special rule governing how the edge-defect influences the electronic and optical properties in AGNRs. Our theoretical prediction demonstrates an efficient way to manipulate the optical properties of AGNRs. This might be of importance in the search for suitable materials designed to have possible technology applications in nano-optical, plasmonic and optoelectronic devices.

Effects of band hybridization on electronic properties in tuning armchair graphene nanoribbons

2016 ◽  
Vol 94 (2) ◽  
pp. 218-225 ◽  
Author(s):  
M. Khatun ◽  
Z. Kan ◽  
A. Cancio ◽  
C. Nelson
Keyword(s):  
Fermi Level ◽  
Density Of States ◽  
Graphene Nanoribbons ◽  
Local Density ◽  
Tight Binding ◽  
Edge States ◽  
Local Density Of States ◽  
Periodic Patterns ◽  
Armchair Graphene Nanoribbons ◽  
Armchair Graphene

We explore a model of armchair graphene nanoribbons tuned by functionalizing the edge states. Edge modifications are modeled by changing the electronic energy of the edge states in specific periodic patterns. The model can be considered to mimic a controlled doping process with different elements. The band structure, density of states, conductance, and local density of states are calculated, using the tight binding approach, Green’s function methodology, and the Landauer formula. The results show interesting behaviors, which are considerably different from the properties of the perfect nanoribbons. The hybridization of conducting bands with non-conducting bands, which appear perfectly flat in the perfect ribbon, opens up and modifies gaps in conductance near the Fermi level. One particular pattern of edge functionalization causes a strong, symmetric, and systematic band gap change about the Fermi level, modifying the electronic characteristics in the energy dispersion, density of states, local density of states, and conductance.

Family-dependent magnetism in atomic boron adsorbed armchair graphene nanoribbons

2019 ◽  
Vol 7 (21) ◽  
pp. 6241-6245 ◽  
Author(s):  
Wei-Wei Yan ◽  
Xiao-Fei Li ◽  
Xiang-Hua Zhang ◽  
Xinrui Cao ◽  
Mingsen Deng
Keyword(s):  
Fermi Level ◽  
Graphene Nanoribbons ◽  
Spin Splitting ◽  
Localized State ◽  
The Family ◽  
Armchair Graphene Nanoribbons ◽  
Armchair Graphene ◽  
Boron Adsorption

Boron adsorption induces a heavily localized state right at the Fermi level only in the family of W = 3p + 1 and thus spin-splitting occurs spontaneously.

Oxygen-promoted synthesis of armchair graphene nanoribbons on Cu(111)

2021 ◽  
Author(s):  
Penghui Ji ◽  
Oliver MacLean ◽  
Gianluca Galeotti ◽  
Dominik Dettmann ◽  
Giulia Berti ◽  
...  
Keyword(s):  
Graphene Nanoribbons ◽  
Armchair Graphene Nanoribbons ◽  
Armchair Graphene

scholarly journals Intrinsic properties of bipolarons in armchair graphene nanoribbons

2021 ◽  
Vol 769 ◽  
pp. 138387
Author(s):  
Gesiel G. Silva ◽  
Wiliam F. da Cunha ◽  
Marcelo L. Pereira Júnior ◽  
Luiz F. Roncaratti ◽  
Luiz A. Ribeiro
Keyword(s):  
Graphene Nanoribbons ◽  
Intrinsic Properties ◽  
Armchair Graphene Nanoribbons ◽  
Armchair Graphene
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