Papers by mohsen farokhnezhad
Theoretical analysis of stimulated Brillouin scattering (SBS) in high power ytterbium-doped doubl... more Theoretical analysis of stimulated Brillouin scattering (SBS) in high power ytterbium-doped double-clad (YDDC) fiber lasers is presented by solving the steady-state rate equations with regard to SBS at different pumping configurations. Distribution of pump, signal and Stokes waves powers in forward, backward and bi-directional pumping configurations through the fiber are investigated. Also, distribution of population inversion through the fiber is shown. Studies shows that amount of backward Brillouin Stokes power in forward pumping configuration is higher than other configurations.
Physical chemistry chemical physics/PCCP. Physical chemistry chemical physics, 2024
Physical Chemistry Chemical Physics
Transition metal dichalcogenides (TMDs) coated gold nanoshells (GNSs), in addition to low cytotox... more Transition metal dichalcogenides (TMDs) coated gold nanoshells (GNSs), in addition to low cytotoxicity and biocompatibility higher than graphene, exhibit strong light absorption in the near-infrared (NIR) region and high photothermal...
Physical review, Dec 23, 2021
Physical review, Nov 9, 2017
Physical Chemistry Chemical Physics, 2019
Optical and photothermal properties of graphene coated gold nanoparticles show that these nanopar... more Optical and photothermal properties of graphene coated gold nanoparticles show that these nanoparticles are more suitable candidates for photothermal therapy applications.
arXiv (Cornell University), Oct 13, 2021
arXiv (Cornell University), Oct 14, 2022
By using non-equilibrium Green's function (NEGF) method and tight-binding (TB) approximation, we ... more By using non-equilibrium Green's function (NEGF) method and tight-binding (TB) approximation, we investigated a perfect control on spin transport in a zigzag α-boron nanoribbon (zigzag α-BNR) as the most stable semi-conducting structure of borophene. It has been found that, when an α-BNR is exposed to an out-of-plane exchange magnetic field, spin filtering occurs for both spin-up and spin-down in specific ranges of energy, so that the spin polarization of current could be controlled by adjusting the energy of incoming electrons by means of an external back gate voltage. We focus on the edge manipulation of α-BNR by ferromagnetic (FM) or anti ferromagnetic (AFM) exchange field which leads to the emergence of a giant magnetoresistance and a perfect spin filter. Local currents provide the best picture of spin distribution of current in the nanoribbon. In order to observe the response of the system to the proximity effect of magnetic strips, we calculated the magnetic moment of each site. Then, we show that applying a transverse or perpendicular electric field in the presence of the exchange magnetic field gives a another controlling tool on the spin polarization of current in a constant energy. Finally, by the simultaneous effect of in-plane and out-of-plane exchange magnetic field on the edges of nanoribbon, we reach a control even on the spin rotation in the scattering region. Our investigation guarantees the α-BNR as a promising two dimensional (2D) structure for spintronic purposes.
Journal of Physics: Materials
The origins of the spin-orbit torque (SOT) at ferromagnet/topological insulator interfaces are in... more The origins of the spin-orbit torque (SOT) at ferromagnet/topological insulator interfaces are incompletely understood. The theory has overwhelmingly focussed on the Edelstein effect due to the surface states in the presence of a scalar scattering potential. We investigate here the contribution to the SOT due to extrinsic spin-orbit (SO) scattering of the surface states, focusing on the case of an out-of-plane magnetization. We show that SO scattering brings about a sizable renormalization of the field-like SOT, which exceeds 20 % at larger strengths of the extrinsic SO parameter. The resulting SOT exhibits a maximum as a function of the Fermi energy, magnetization, and extrinsic SO strength. The field-like SOT decreases with increasing disorder strength, while the damping-like SOT is independent of the impurity density. With experimental observation in mind we also determine the role of extrinsic SO scattering on the anomalous Hall effect. Our results suggest extrinsic SO scatterin...
Journal of Physics D: Applied Physics, 2020
In the current work, the optical properties of graphene wrapped gold nanoshells (GGNSs) with s... more In the current work, the optical properties of graphene wrapped gold nanoshells (GGNSs) with silica core for different sizes and geometries are investigated based on effective medium and Gans theories in tumor tissue. In addition, the bioheat transfer equations are used to obtain the temperature distribution in the kidney tumor and its surrounding medium. The localized surface plasmon resonance (LSPR) peak of GGNSs can be easily tuned inside a large region of biological windows by controlling the thicknesses of gold and graphene layers and their aspect ratios for spheroidal nanoshells. Also, we show that oblate spheroidal GGNSs due to high temperature rise are very effective for photothermal cancer therapy. Moreover, the amount of temperature rise for spherical nanoshells increases as the thickness of graphene shell increases, while it is independent of the thickness of graphene shell for spheroidal GNSs. Finally, the regions of tumor tissue with permanent thermal damage are determined by calculating thermal damage in tumor tissue. Our results demonstrate that GGNSs have a high potential for photothermal cancer therapy.
The Journal of Physical Chemistry C, 2019
Physical Chemistry Chemical Physics, 2019
Optical and photothermal properties of graphene coated gold nanoparticles show that these nanopar... more Optical and photothermal properties of graphene coated gold nanoparticles show that these nanoparticles are more suitable candidates for photothermal therapy applications.
Journal of Applied Physics, 2015
Using non-equilibrium Green's function, we study the spin-dependent electron transport proper... more Using non-equilibrium Green's function, we study the spin-dependent electron transport properties in a zigzag silicene nanoribbon. To produce and control spin polarization, it is assumed that two ferromagnetic strips are deposited on the both edges of the silicene nanoribbon and an electric field is perpendicularly applied to the nanoribbon plane. The spin polarization is studied for both parallel and anti-parallel configurations of exchange magnetic fields induced by the ferromagnetic strips. We find that complete spin polarization can take place in the presence of perpendicular electric field for anti-parallel configuration and the nanoribbon can work as a perfect spin filter. The spin direction of transmitted electrons can be easily changed from up to down and vice versa by reversing the electric field direction. For parallel configuration, perfect spin filtering can occur even in the absence of electric field. In this case, the spin direction can be changed by changing the e...
Journal of physics. Condensed matter, Apr 25, 2024
Physical review, Feb 8, 2023
JPhys materials, Dec 2, 2022
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Papers by mohsen farokhnezhad