59 citations · 373 across the 15 of their papers we have counts for
15 papers
Optical properties of hydrogenated graphene superlattices
Vasil A. Saroka, Olivia Pulci, Marco D'Alessandro
We investigate with first principles theoretical methods optical response accounting for excitonic effects of quasi-one dimensional monolithic arrays of graphene nanostripes -- two…
On flat band engineering and graphene magnonics
Vasil A. Saroka
Graph-theoretic topological frustration is a peculiar situation on a finite piece of the honeycomb lattice that prevents a full pairwise coupling of the lattice sites via nearest n…
Beyond the Quantum Picture: The Electrodynamic Origin of Chiral Nanoplasmonics
Vasil Saroka, Lorenzo Cupellini, Nicolò Maccaferri +2
Chiral plasmonic nanostructures are rapidly emerging as ideal substrates for enantioselective sensing, chiral near-field engineering, and plasmon-assisted catalysis, owing to their…
Tunable chiral anomalies and coherent transport on a honeycomb lattice
Vasil A. Saroka, Fanmiao Kong, Charles A. Downing +4
The search for energy efficient materials is urged not only by the needs of modern electronics but also by emerging applications in neuromorphic computing and artificial intelligen…
Exceptional points in oligomer chains
C. A. Downing, V. A. Saroka
Symmetry underpins our understanding of physical law. Open systems, those in contact with their environment, can provide a platform to explore parity-time symmetry. While classical…
Interband transitions in narrow-gap carbon nanotubes and graphene nanoribbons
R. R. Hartmann, V. A. Saroka, M. E. Portnoi
We use the robust nearest-neighbour tight-binding approximation to study on the same footing interband dipole transitions in narrow-bandgap carbon nanotubes and graphene nanoribbon…
Momentum alignment and the optical valley Hall effect in low-dimensional Dirac materials
V. A. Saroka, R. R. Hartmann, M. E. Portnoi
We study the momentum alignment of photoexcited carriers and the optical control of valley population in gapless and gapped two-dimensional Dirac materials. The trigonal warping ef…
Phosphorene quantum dot electronic properties and gas sensing
Hazem Abdelsalam, Vasil A. Saroka, Waleed O. Younis
Density functional theory calculations are performed on phosphorene quantum dots having different shapes and edge terminations to investigate their structure stability, electronic…
Hidden correlation between absorption peaks in achiral carbon nanotubes and nanoribbons
V. A. Saroka, A. L. Pushkarchuk, S. A. Kuten +1
In this paper we study the effect of absorption peak correlation in finite length carbon nanotubes and graphene nanoribbons. It is shown, in the orthogonal π-orbital tight-binding…
Tuning terahertz transitions in a double-gated quantum ring
T. P. Collier, V. A. Saroka, M. E. Portnoi
We theoretically investigate the optical functionality of a semiconducting quantum ring manipulated by two electrostatic lateral gates used to induce a double quantum well along th…
Strong Light-Matter Coupling in Carbon Nanotubes as a Route to Exciton Brightening
Vanik A. Shahnazaryan, Vasil A. Saroka, Ivan A. Shelykh +2
We show that strong light-matter coupling can be used to overcome a long standing problem that has prevented efficient optical emission from carbon nanotubes. The luminescence from…
Electro-optical properties of phosphorene quantum dots
V. A. Saroka, I. Lukyanchuk, M. E. Portnoi +1
We study electronic and optical properties of single layer phosphorene quantum dots with various shapes, sizes, and edge types (including disordered edges) subjected to an external…
Optical selection rules of zigzag graphene nanoribbons
V. A. Saroka, M. V. Shuba, M. E. Portnoi
We present an analytical tight-binding theory of the optical properties of graphene nanoribbons with zigzag edges. Applying the transfer matrix technique to the nearest-neighbor ti…
Electro-absorption of silicene and bilayer graphene quantum dots
H. Abdelsalam, M. H. Talaat, I. Lukyanchuk +2
We study numerically the optical properties of low-buckled silicene and AB-stacked bilayer graphene quantum dots subjected to an external electric field, which is normal to their s…
Band Gaps in Jagged and Straight Graphene Nanoribbons Tunable by an External Electric Field
V. A. Saroka, K. G. Batrakov, V. A. Demin +1
Band gap control by an external field is useful in various optical, infrared and THz applications. However, widely tunable band gaps are still not practical due to variety of reaso…