98 citations · 616 across the 41 of their papers we have counts for
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Strong Spin Filtering by Silicon Nanoparticles with Adsorbed Bismuth Atom Clusters: Role of Symmetry and Electrostatic Control of the Direction of the Spin Polarization
Alireza Saffarzadeh, George Kirczenow
We present a theoretical study, based on density functional theory and tight binding modeling, of the electronic structure and spin transport properties of silicon nanoparticles wi…
Electron beam splitting at topological insulator surface states and a proposal for electronic Goos-Hanchen shift measurement
Hassan Ghadiri, Alireza Saffarzadeh
The hexagonal warping effect on transport properties and Goos-Hänchen (GH) lateral shift of electrons on the surface of a topological insulator with a potential barrier is investig…
Doping-controlled surface conduction in topological insulators with warping effects
Masomeh Arabikhah, Alireza Saffarzadeh
Based on a self-consistent -matrix approximation, we explore the influence of magnetic and nonmagnetic doping on the surface electronic states and conductivity of topological in…
Nearly perfect spin-filtering in curved two-dimensional topological insulators
Alireza Saffarzadeh, George Kirczenow
The spintronic properties of curved nanostructures derived from two-dimensional topological insulators (2DTI's) are explored theoretically with density functional theory-based (DFT…
Electron scattering in a superlattice of line defects on the surface of topological insulators
H. Dehnavi, A. A. Masoudi, M. Saadat +2
The electron scattering from periodic line defects on the surface of topological insulators with hexagonal warping effect is investigated theoretically by means of a transfer matri…
Gas adsorption effects on electronic and magnetic properties of triangular graphene antidot lattices
Zahra Talebi Esfahani, Alireza Saffarzadeh, Ahmad Akhound +1
The adsorption effects of small molecules (HO, CO, NH, NO) and large molecules (Tetracyanoquinodimethane (TCNQ) and Tetrafluoro-tetracyanoquinodimethane (F4TCNQ))…
Mechanisms of jump to contact and conductance plateau formation in copper atomic junctions in vacuum and aqueous environments
Alireza Saffarzadeh, George Kirczenow
The interplay between groups of water molecules and single-atom contacts, as reflected in the electrical conductances and mechanical forces of copper atomic junctions, is explored…
Surface state transport in double-gated and magnetized topological insulators with hexagonal warping effects
Masomeh Arabikhah, Alireza Saffarzadeh
We explore the scattering of Dirac electrons in a double-gated topological insulator in the presence of magnetic proximity effects and warped surface states. It is found that a mag…
A DFT study on the electronic and magnetic properties of triangular graphene antidot lattices
Zahra Talebi Esfahani, Alireza Saffarzadeh, Ahmad Akhound
We explore the effect of antidot size on electronic and magnetic properties of graphene antidot lattices from first-principles calculations. The spin-polarized density of states, b…
Thermoelectric voltage switching in gold atomic wire junctions
Alireza Saffarzadeh, Firuz Demir, George Kirczenow
We explore the thermoelectric properties of gold atomic chains bridging gold electrodes by means of \textit{ab initio} and semi-empirical calculations, and heuristic reasoning. We…
Optoelectronic properties of defective MoS and WS monolayers
Saboura Salehi, Alireza Saffarzadeh
We theoretically explore the effect of metal and disulphur vacancies on electronic and optical properties of MoS and WS monolayers based on a Slater-Koster tight-binding mo…
Band-offset-induced lateral shift of valley electrons in ferromagnetic MoS/WS planar heterojunctions
Hassan Ghadiri, Alireza Saffarzadeh
Low-energy coherent transport and Goos-Hänchen (GH) lateral shift of valley electrons in planar heterojunctions composed of normal MoS and ferromagnetic WS monolayers are t…
Malleability at the extreme nanoscale: Slow and fast quakes of few-body systems
Alireza Saffarzadeh, George Kirczenow
We explore the malleability of ultra-small metal nanoparticles by means of ab initio calculations. It is revealed that, when strained, such nanoparticles exhibit complex behavior,…
Gate-controlled valley transport and Goos-Hänchen effect in monolayer WS
Hassan Ghadiri, Alireza Saffarzadeh
Based on a Dirac-like Hamiltonian and coherent scattering formalism, we study spin-valley transport and Goos-Hänchen like (GHL) effect of transmitted and reflected electrons in a g…
Atomic defect states in monolayers of MoS and WS
Saboura Salehi, Alireza Saffarzadeh
The influence of atomic vacancy defects at different concentrations on electronic properties of MoS and WS monolayers is studied by means of Slater-Koster tight-binding mod…
Generation of fully spin-polarized currents in three-terminal graphene-based transistors
Rouhollah Farghadan, Alireza Saffarzadeh
We propose three-terminal spin devices with graphene nanoribbons (terminals) and a graphene flake (channel) to generate a highly spin-polarized current without an external magnetic…
Coulomb bound states and resonances due to groups of Ca dimers adsorbed on suspended graphene
Alireza Saffarzadeh, George Kirczenow
The electronic bound states and resonances in the vicinity of the Dirac point energy due to the adsorption of calcium dimers on a suspended graphene monolayer are explored theoreti…
Mechanism of the enhanced conductance of a molecular junction under tensile stress
Alireza Saffarzadeh, Firuz Demir, George Kirczenow
Despite its fundamental importance for nano physics and chemistry and potential device applications, the relationship between atomic structure and electronic transport in molecular…
Voltage-controlled spin injection with an endohedral fullerene CoC dimer
Alireza Saffarzadeh, George Kirczenow
Spin-dependent transport through an endohedral fullerene Co@C dimer with gold electrodes is explored theoretically using density functional and extended Hückel theory. Densi…
Scanning tunneling spectroscopy and Dirac point resonances due to a single Co adatom on gated graphene
Alireza Saffarzadeh, George Kirczenow
Based on the standard tight-binding model of the graphene -band electronic structure, the extended Hückel model for the adsorbate and graphene carbon atoms, and spin splittings…
Electronic and optical spectra in a diluted magnetic semiconductor multilayer
Leili Gharaee, Alireza Saffarzadeh
The effects of random distribution of magnetic impurities with concentration in a semiconductor alloy multilayer at a paramagnetic temperature are investigated by means of cohe…
Modeling of gas adsorption on graphene nanoribbons
Alireza Saffarzadeh
We present a theory to study gas molecules adsorption on armchair graphene nanoribbons (AGNRs) by applying the results of \emph{ab} \emph{initio} calculations to the single-band ti…
The effect of vacancy-induced magnetism on electronic transport in armchair carbon nanotubes
R. Farghadan, A. Saffarzadeh
The influence of local magnetic moment formation around three kinds of vacancies on the electron conduction through metallic single-wall carbon nanotubes is studied by use of the L…
Optical absorption spectrum in disordered semiconductor multilayers
Alireza Saffarzadeh, Leili Gharaee
The effects of chemical disorder on the electronic and optical properties of semiconductor alloy multilayers are studied based on the tight-binding theory and single-site coherent…