Optical properties of armchair graphene nanoribbons under uniaxial strain

2014 ◽  
Vol 251 (6) ◽  
pp. 1252-1256 ◽  
Author(s):  
Yonglei Jia ◽  
Yang Gao
Keyword(s):  
Optical Properties ◽  
Graphene Nanoribbons ◽  
Uniaxial Strain ◽  
Armchair Graphene Nanoribbons ◽  
Armchair Graphene

Electronic and optical properties of surface-functionalized armchair graphene nanoribbons

RSC Advances ◽  
2016 ◽  
Vol 6 (28) ◽  
pp. 23974-23980 ◽  
Author(s):  
Min Wang ◽  
Si Xing Song ◽  
Hai Xing Zhao ◽  
Yu Chen Wang
Keyword(s):  
Optical Properties ◽  
Spatial Distribution ◽  
Functional Groups ◽  
Graphene Nanoribbons ◽  
Electronic And Optical Properties ◽  
Armchair Graphene Nanoribbons ◽  
Armchair Graphene

The functional groups on armchair graphene nanoribbons affect the spatial distribution of the wavefunction and influence the electronic and optical properties as well.

Spin gapless armchair graphene nanoribbons under magnetic field and uniaxial strain

2013 ◽  
Vol 22 (8) ◽  
pp. 087303
Author(s):  
Hai-Ping Hou ◽  
Yue-E Xie ◽  
Yuan-Ping Chen ◽  
Tao Ouyang ◽  
Qing-Xia Ge ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Graphene Nanoribbons ◽  
Uniaxial Strain ◽  
Armchair Graphene Nanoribbons ◽  
Armchair Graphene

Exciton effects in strained armchair graphene nanoribbons

2016 ◽  
Vol 30 (06) ◽  
pp. 1650021 ◽  
Author(s):  
Yonglei Jia ◽  
Junlin Liu
Keyword(s):  
Binding Energy ◽  
Excitation Energy ◽  
Graphene Nanoribbons ◽  
Tight Binding ◽  
Uniaxial Strain ◽  
Exciton Binding Energy ◽  
Coulomb Interactions ◽  
Optomechanical Systems ◽  
Armchair Graphene Nanoribbons ◽  
Armchair Graphene

The exciton effects in 1-nm-wide armchair graphene nanoribbons (AGNRs) under the uniaxial strain were studied within the nonorthogonal tight-binding (TB) model, supplemented by the long-range Coulomb interactions. The obtained results show that both the excitation energy and exciton binding energy are modulated by the uniaxial strain. The variation of these energies depends on the ribbon family. In addition, the results show that the variation of the exciton binding energy is much weaker than the variation of excitation energy. Our results provide new guidance for the design of optomechanical systems based on graphene nanoribbons.

Electronic properties of armchair graphene nanoribbons under uniaxial strain and electric field

2018 ◽  
Vol 32 (24) ◽  
pp. 1850263 ◽  
Author(s):  
Li-Feng Jiang ◽  
Lei Xu ◽  
Jun Zhang
Keyword(s):  
Electric Field ◽  
Electronic Properties ◽  
Energy Gap ◽  
Graphene Nanoribbons ◽  
Uniaxial Strain ◽  
Quantum Phenomenon ◽  
Suitable Combination ◽  
Armchair Graphene Nanoribbons ◽  
Opening And Closing ◽  
Armchair Graphene

The armchair graphene nanoribbons (AGNRs) can be either semiconducting or metallic, depending on their widths. We investigate the electronic properties of AGNRs under uniaxial strain and electric field. We find that the bulk gap decreases gradually with the increase of the electric field for semiconducting case, but it cannot vanish completely in an appropriate range, which is similar to that of a single uniaxial strain. However, a suitable combination of electric field and uniaxial strain can lead to that the energy gap completely vanishes and reopens. For the metallic case, the bulk gap can display the same opening and closing behavior under an electric field and uniaxial strain. Finally, an interesting quantum phenomenon is obtained by applying a perpendicular magnetic field.

scholarly journals Electronic and Optical Properties of the Narrowest Armchair Graphene Nanoribbons Studied by Density Functional Methods

2016 ◽  
Vol 69 (9) ◽  
pp. 960 ◽  
Author(s):  
Chia-Nan Yeh ◽  
Pei-Yin Lee ◽  
Jeng-Da Chai
Keyword(s):  
Density Functional Theory ◽  
Optical Properties ◽  
Ground State ◽  
Density Functional ◽  
Graphene Nanoribbons ◽  
Finite Size ◽  
Functional Theory ◽  
Electronic And Optical Properties ◽  
Armchair Graphene Nanoribbons ◽  
Armchair Graphene

In the present study, a series of planar poly(p-phenylene) (PPP) oligomers with n phenyl rings (n = 1–20), designated as n-PP, are taken as finite-size models of the narrowest armchair graphene nanoribbons with hydrogen passivation. The singlet-triplet energy gap, vertical ionization potential, vertical electron affinity, fundamental gap, optical gap, and exciton binding energy of n-PP are calculated using Kohn-Sham density functional theory and time-dependent density functional theory with various exchange-correlation density functionals. The ground state of n-PP is shown to be singlet for all the chain lengths studied. In contrast to the lowest singlet state (i.e., the ground state) of n-PP, the lowest triplet state of n-PP and the ground states of the cation and anion of n-PP are found to exhibit some multi-reference character. Overall, the electronic and optical properties of n-PP obtained from the ωB97 and ωB97X functionals are in excellent agreement with the available experimental data.

Sign in / Sign up

Export Citation Format

Share Document