Interface Coupling as a Crucial Factor for Spatial Localization of Electronic States in a Heterojunction of Graphene Nanoribbons

2019 ◽  
Vol 11 (2) ◽  
Author(s):  
Yawei Lv ◽  
Qijun Huang ◽  
Sheng Chang ◽  
Hao Wang ◽  
Jin He ◽  
...  
Keyword(s):  
Graphene Nanoribbons ◽  
Electronic States ◽  
Spatial Localization ◽  
Interface Coupling

Tailoring plasmon excitations in α − T3 armchair nanoribbons

2021 ◽  
Author(s):  
Andrii Iurov ◽  
Liubov Zhemchuzhna ◽  
Godfrey Gumbs ◽  
Danhong Huang ◽  
Paula Fekete ◽  
...  
Keyword(s):  
Energy Gap ◽  
Graphene Nanoribbons ◽  
Electronic States ◽  
Landau Damping ◽  
Next Generation ◽  
Polarization Function ◽  
Edge Termination

Abstract We have calculated and investigated the electronic states, dynamical polarization function and the plasmon excitations for α − T3 nanoribbons with armchair-edge termination. The obtained plasmon dispersions are found to depend significantly on the number of atomic rows across the ribbon and the energy gap which is also determined by the nanoribbon geometry. The bandgap appears to have the strongest effect on both the plasmon dispersions and their Landau damping. We have determined the conditions when relative hopping parameter α of an α − T3 lattice has a strong effect on the plasmons which makes our material distinguished from graphene nanoribbons. Our results for the electronic and collective properties of α − T3 nanoribbons are expected to find numerous applications in the development of the next-generation electronic, nano-optical and plasmonic devices.

Character of electronic states in graphene antidot lattices: Flat bands and spatial localization

2009 ◽  
Vol 80 (4) ◽  
Author(s):  
Mihajlo Vanević ◽  
Vladimir M. Stojanović ◽  
Markus Kindermann
Keyword(s):  
Electronic States ◽  
Spatial Localization ◽  
Flat Bands

scholarly journals Time Evolution of Floquet States in Graphene

2018 ◽  
Vol 2018 ◽  
pp. 1-10 ◽  
Author(s):  
F. Manghi ◽  
M. Puviani ◽  
F. Lenzini
Keyword(s):  
Band Structure ◽  
Time Evolution ◽  
Electromagnetic Fields ◽  
Graphene Nanoribbons ◽  
Electronic States ◽  
The State ◽  
Time Dependent ◽  
Edge States ◽  
State Population ◽  
Floquet States

Based on a solution of the Floquet Hamiltonian we have studied the time evolution of electronic states in graphene nanoribbons driven out of equilibrium by time-dependent electromagnetic fields in different regimes of intensity, polarization, and frequency. We show that the time-dependent band structure contains many unconventional features that are not captured by considering the Floquet eigenvalues alone. By analyzing the evolution in time of the state population we have identified regimes for the emergence of time-dependent edge states responsible for charge oscillations across the ribbon.

scholarly journals Tailoring plasmon excitations in $$\alpha -{\mathcal {T}}_3$$ armchair nanoribbons

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Andrii Iurov ◽  
Liubov Zhemchuzhna ◽  
Godfrey Gumbs ◽  
Danhong Huang ◽  
Paula Fekete ◽  
...  
Keyword(s):  
Energy Gap ◽  
Graphene Nanoribbons ◽  
Electronic States ◽  
Landau Damping ◽  
Next Generation ◽  
Polarization Function ◽  
Edge Termination

AbstractWe have calculated and investigated the electronic states, dynamical polarization function and the plasmon excitations for $$\alpha -{\mathcal {T}}_3$$ α - T 3 nanoribbons with armchair-edge termination. The obtained plasmon dispersions are found to depend significantly on the number of atomic rows across the ribbon and the energy gap which is also determined by the nanoribbon geometry. The bandgap appears to have the strongest effect on both the plasmon dispersions and their Landau damping. We have determined the conditions when relative hopping parameter $$\alpha $$ α of an $$\alpha -{\mathcal {T}}_3$$ α - T 3 lattice has a strong effect on the plasmons which makes our material distinguished from graphene nanoribbons. Our results for the electronic and collective properties of $$\alpha -{\mathcal {T}}_3$$ α - T 3 nanoribbons are expected to find numerous applications in the development of the next-generation electronic, nano-optical and plasmonic devices.

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