scholarly journals Exciton absorption spectra in narrow armchair graphene nanoribbons in an electric field

2019 ◽  
Vol 99 (16) ◽  
Author(s):  
B. S. Monozon ◽  
P. Schmelcher
Keyword(s):  
Electric Field ◽  
Absorption Spectra ◽  
Graphene Nanoribbons ◽  
Exciton Absorption ◽  
Armchair Graphene Nanoribbons ◽  
Armchair Graphene

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 THE EFFECT OF CRITICAL ELECTRIC FIELDS ON THE ELECTRONIC DISTRIBUTION OF BILAYER ARMCHAIR GRAPHENE NANORIBBONS

2021 ◽  
pp. 98-112
Author(s):  
Lam Thuy Duong Nguyen ◽  
Thi Kim Quyen Nguyen ◽  
Nguyen Huu Hanh Pham ◽  
Dang Khoa Le ◽  
Van Chinh Ngo ◽  
...  
Keyword(s):  
Electric Field ◽  
Electric Fields ◽  
Energy Band ◽  
Graphene Nanoribbons ◽  
Strong Impact ◽  
Parallel Electric Field ◽  
Electronic Distribution ◽  
Wide Range ◽  
Armchair Graphene Nanoribbons ◽  
Armchair Graphene

We employed tight-binding calculations and Green’s function formalism to investigate the effect of applied electric fields on the energy band and electronic properties of bilayer armchair graphene nanoribbons (BL-AGNRs). The results show that the perpendicular electric field has a strong impact on modifying and controlling the bandgap of BL-AGNRs. At the critical values of this electric field, distortions of energy dispersion in subbands and the formation of new electronic excitation channels occur strongly. These originate from low-lying energies near the Fermi level and move away from the zero-point with the increment of the electric field. Phase transitions and structural changes clearly happen in these materials. The influence of the parallel electric field is less important in changing the gap size, resulting in the absence of the critical voltage over a very wide range [–1.5 V; 1.5 V] for the semiconductor-insulator group. Nevertheless, it is interesting to note the powerful role of the parallel electric field in modifying the energy band and electronic distribution at each energy level. These results contribute to an overall picture of the physics model and electronic structure of BL-AGNRs under stimuli, which can be a pathway to real applications in the future, particularly for electronic devices.

Tunable Bandgap in Bilayer Armchair Graphene Nanoribbons: Concurrent Influence of Electric Field and Uniaxial Strain

2013 ◽  
Vol 60 (8) ◽  
pp. 2464-2470 ◽  
Author(s):  
Kaveh Khaliji ◽  
Maziar Noei ◽  
Seyed Mohammad Tabatabaei ◽  
Mahdi Pourfath ◽  
Morteza Fathipour ◽  
...  
Keyword(s):  
Electric Field ◽  
Graphene Nanoribbons ◽  
Uniaxial Strain ◽  
Tunable Bandgap ◽  
Armchair Graphene Nanoribbons ◽  
Armchair Graphene

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
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