scholarly journals Dirac point resonances due to atoms and molecules adsorbed on graphene and transport gaps and conductance quantization in graphene nanoribbons with covalently bonded adsorbates

2011 ◽  
Vol 83 (24) ◽  
Author(s):  
Siarhei Ihnatsenka ◽  
George Kirczenow
Keyword(s):  
Dirac Point ◽  
Graphene Nanoribbons ◽  
Conductance Quantization ◽  
Atoms And Molecules ◽  
Covalently Bonded ◽  
Transport Gaps

EFFECTIVE MOBILITY MODEL OF GRAPHENE NANORIBBON IN PARABOLIC BAND ENERGY

2011 ◽  
Vol 25 (10) ◽  
pp. 739-745 ◽  
Author(s):  
N. A. AMIN ◽  
M. T. AHMADI ◽  
Z. JOHARI ◽  
S. M. MOUSAVI ◽  
R. ISMAIL
Keyword(s):  
Experimental Data ◽  
Band Structure ◽  
Transport Properties ◽  
Conventional Method ◽  
Dirac Point ◽  
Graphene Nanoribbons ◽  
Mobility Model ◽  
Band Energy ◽  
One Dimensional ◽  
Effective Mobility

In this letter, we investigate the transport properties of one-dimensional semiconducting Graphene nanoribbons (GNRs) with parabolic band structure near the Dirac point. The analytical model of effective mobility is developed by using the conductance approach, which differs from the conventional method of extracting the effective mobility using the well-known Matthiessen rule. Graphene nanoribbons conductance model developed was applied in the Drude model to obtain the effective mobility, which then gives nearly close comparison with the experimental data.

Energy and transport gaps in etched graphene nanoribbons

2010 ◽  
Vol 25 (3) ◽  
pp. 034002 ◽  
Author(s):  
F Molitor ◽  
C Stampfer ◽  
J Güttinger ◽  
A Jacobsen ◽  
T Ihn ◽  
...  
Keyword(s):  
Graphene Nanoribbons ◽  
Transport Gaps

scholarly journals Topological Metal-Insulator Transition in Narrow Graphene Nanoribbons?

2020 ◽  
Author(s):  
Aristides Zdetsis ◽  
Eleftherios Economou
Keyword(s):  
Dirac Point ◽  
Energy Gap ◽  
Graphene Nanoribbons ◽  
Critical Length ◽  
Dimensional System ◽  
Edge States ◽  
Aromatic Rings ◽  
Metal Insulator ◽  
A Value ◽  
Armchair Graphene Nanoribbons

We show that very narrow armchair graphene nanoribbons (AGNRs) of length L and width of 2 zigzag-rings undergo a metal-insulator-like transition at a critical length of 10nm, where the energy gap drops rather abruptly, and the conductivity, estimated, through an invoked computational scheme, rises almost discontinuously to a value between that of a perfect quasi one-dimensional system, and the nominal minimum conductivity of graphene. At this length, the aromatic and non-aromatic rings are interchanged, and sharp peaks appear in the density of states around the Fermi level, suggesting metallic-like behaviour. Such peaks linked to edge states at the Dirac point(s) coincide with the charge-neutrality point(s), associated with the minimum conductivity of graphene. Thus, we have an uncommon combination of interrelated “short-long”, “core-edge,” topological-aromatic transition(s) due to strong quantum confinement, driven by inversion symmetry conflict. The bandgap decreases with the 2/3 power of length before the “transition” and logarithmically afterwards. These effects are practically non-existent for wider AGNRs

scholarly journals Topological Metal-Insulator Transition in Narrow Graphene Nanoribbons?

2020 ◽  
Author(s):  
Aristides Zdetsis ◽  
Eleftherios Economou
Keyword(s):  
Dirac Point ◽  
Energy Gap ◽  
Graphene Nanoribbons ◽  
Critical Length ◽  
Dimensional System ◽  
Edge States ◽  
Aromatic Rings ◽  
Metal Insulator ◽  
A Value ◽  
Armchair Graphene Nanoribbons

We show that very narrow armchair graphene nanoribbons (AGNRs) of length L and width of 2 zigzag-rings undergo a metal-insulator-like transition at a critical length of 10nm, where the energy gap drops rather abruptly, and the conductivity, estimated, through an invoked computational scheme, rises almost discontinuously to a value between that of a perfect quasi one-dimensional system, and the nominal minimum conductivity of graphene. At this length, the aromatic and non-aromatic rings are interchanged, and sharp peaks appear in the density of states around the Fermi level, suggesting metallic-like behaviour. Such peaks linked to edge states at the Dirac point(s) coincide with the charge-neutrality point(s), associated with the minimum conductivity of graphene. Thus, we have an uncommon combination of interrelated “short-long”, “core-edge,” topological-aromatic transition(s) due to strong quantum confinement, driven by inversion symmetry conflict. The bandgap decreases with the 2/3 power of length before the “transition” and logarithmically afterwards. These effects are practically non-existent for wider AGNRs

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