scholarly journals PERFECTLY CONDUCTING CHANNEL AND ITS ROBUSTNESS IN DISORDERED CARBON NANOSTRUCTURES

2012 ◽  
Vol 11 ◽  
pp. 157-162 ◽  
Author(s):  
YUKI ASHITANI ◽  
KEN-ICHIRO IMURA ◽  
YOSITAKE TAKANE
Keyword(s):  
Carbon Nanotubes ◽  
Carbon Nanostructures ◽  
Graphene Nanoribbons ◽  
Numerical Study ◽  
Conducting Channel ◽  
Disordered Carbon ◽  
Zigzag Graphene Nanoribbons

We report our recent numerical study on the effects of dephasing on a perfectly conducting channel (PCC), its presence believed to be dominant in the transport characteristics of a zigzag graphene nanoribbons (GNR) and of a metallic carbon nanotubes (CNT). Our data confirms an earlier prediction that a PCC in GNR exhibits a peculiar robustness against dephasing, in contrast to that of the CNT. By studying the behavior of the conductance as a function of the system's length we show that dephasing destroys the PCC in CNT, whereas it stabilizes the PCC in GNR. Such opposing responses of the PCC against dephasing stem from a different nature of the PCC in these systems.

scholarly journals 2N+4-rule and an atlas of bulk optical resonances of zigzag graphene nanoribbons

2020 ◽  
Vol 11 (1) ◽  
Author(s):  
Renebeth B. Payod ◽  
Davide Grassano ◽  
Gil Nonato C. Santos ◽  
Dmitry I. Levshov ◽  
Olivia Pulci ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Structural Characterization ◽  
Graphene Nanoribbons ◽  
Building Blocks ◽  
Linear Mapping ◽  
Unit Cell ◽  
Single Wall Carbon Nanotubes ◽  
On Chip ◽  
Zigzag Graphene Nanoribbons

AbstractDevelopment of on-chip integrated carbon-based optoelectronic nanocircuits requires fast and non-invasive structural characterization of their building blocks. Recent advances in synthesis of single wall carbon nanotubes and graphene nanoribbons allow for their use as atomically precise building blocks. However, while cataloged experimental data are available for the structural characterization of carbon nanotubes, such an atlas is absent for graphene nanoribbons. Here we theoretically investigate the optical absorption resonances of armchair carbon nanotubes and zigzag graphene nanoribbons continuously spanning the tube (ribbon) transverse sizes from 0.5(0.4) nm to 8.1(12.8) nm. We show that the linear mapping is guaranteed between the tube and ribbon bulk resonance when the number of atoms in the tube unit cell is $$2N+4$$2N+4, where $$N$$N is the number of atoms in the ribbon unit cell. Thus, an atlas of carbon nanotubes optical transitions can be mapped to an atlas of zigzag graphene nanoribbons.

Calcium-decorated carbon nanostructures for the selective capture of carbon dioxide

2016 ◽  
Vol 18 (42) ◽  
pp. 29086-29091 ◽  
Author(s):  
Jahyun Koo ◽  
Hyeonhu Bae ◽  
Lei Kang ◽  
Bing Huang ◽  
Hoonkyung Lee
Keyword(s):  
Carbon Dioxide ◽  
First Principles ◽  
Carbon Nanostructures ◽  
Graphene Nanoribbons ◽  
First Principles Calculations ◽  
Carbon Dioxide Adsorption ◽  
Zigzag Graphene Nanoribbons

First-principles calculations of carbon dioxide adsorption on Ca-decorated nanostructures were performed to examine the feasibility of using the nanostructures for the selective capture of carbon dioxide. Ca-decorated nanostructures, such as zigzag graphene nanoribbons and graphyne, can serve as highly selective CO2 capture materials.

Topological Surface State in Epitaxial Zigzag Graphene Nanoribbons

Nano Letters ◽  
2021 ◽  
Vol 21 (7) ◽  
pp. 2876-2882
Author(s):  
Thi Thuy Nhung Nguyen ◽  
Niels de Vries ◽  
Hrag Karakachian ◽  
Markus Gruschwitz ◽  
Johannes Aprojanz ◽  
...  
Keyword(s):  
Surface State ◽  
Graphene Nanoribbons ◽  
Topological Surface ◽  
Topological Surface State ◽  
Zigzag Graphene Nanoribbons

scholarly journals Spin current distribution in antiferromagnetic zigzag graphene nanoribbons under transverse electric fields

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Jie Zhang ◽  
Eric P. Fahrenthold
Keyword(s):  
Electric Fields ◽  
Transverse Electric ◽  
Graphene Nanoribbons ◽  
Spin Current ◽  
Differential Resistance ◽  
Current Control ◽  
Field Analysis ◽  
Current Transmission ◽  
Transverse Electric Fields ◽  
Zigzag Graphene Nanoribbons

AbstractThe spin current transmission properties of narrow zigzag graphene nanoribbons (zGNRs) have been the focus of much computational research, investigating the potential application of zGNRs in spintronic devices. Doping, fuctionalization, edge modification, and external electric fields have been studied as methods for spin current control, and the performance of zGNRs initialized in both ferromagnetic and antiferromagnetic spin states has been modeled. Recent work has shown that precise fabrication of narrow zGNRs is possible, and has addressed long debated questions on their magnetic order and stability. This work has revived interest in the application of antiferromagnetic zGNR configurations in spintronics. A general ab initio analysis of narrow antiferromagnetic zGNR performance under a combination of bias voltage and transverse electric field loading shows that their current transmission characteristics differ sharply from those of their ferromagnetic counterparts. At relatively modest field strengths, both majority and minority spin currents react strongly to the applied field. Analysis of band gaps and current transmission pathways explains the presence of negative differential resistance effects and the development of spatially periodic electron transport structures in these nanoribbons.

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