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Novel structures for carbon nanotube field effect transistors
, Article International Journal of Modern Physics B ; Volume 23, Issue 19 , 2009 , Pages 3669-3678 ; 02179792 (ISSN) ; Hosseini, S. E ; Sharif University of Technology
2009
Abstract
A carbon nanotube field effect transistor (CNTFET) has been studied based on the SchrödingerPoisson formalism. To improve the saturation range in the output characteristics, new structures for CNTFETs are proposed. These structures are simulated and compared with the conventional structure. Simulations show that these structures have a wider output saturation range. With this, larger drain-source voltage (Vds) can be used, which results in higher output power. In the digital circuits, higher Vds increases noise immunity. © 2009 World Scientific Publishing Company
Stability under Γ-convergence of least energy solutions for semilinear problems in the whole ℝN
, Article SIAM Journal on Mathematical Analysis ; Volume 43, Issue 4 , 2011 , Pages 1759-1786 ; 00361410 (ISSN) ; Sharif University of Technology
2011
Abstract
We study the homogenization of semilinear elliptic equations in divergence form with discontinuous oscillating coefficients in the whole ℝN. As is well known, the homogenization process in a classical framework is concerned with the study of asymptotic behavior of solutions u Isin; of boundary value problems when the period ∈ > 0 of the coefficients is small. By extending some of the classical homogenization results for quasi-linear elliptic equations to unbounded domains and, making use of various variational techniques, we shall establish some stability results under Γ-convergence of least energy solutions for such boundary value problems
A proposed mechanism for mind-brain interaction using extended Bohmian quantum mechanics in Avicenna's monotheistic perspective
, Article Heliyon ; Volume 5, Issue 7 , 2019 ; 24058440 (ISSN) ; Golshani, M ; Jamali, Y ; Sharif University of Technology
Elsevier Ltd
2019
Abstract
In quantum approaches to consciousness, the authors try to propose a model and mechanism for the mind-brain interaction using modern physics and some quantum concepts which do not exist in the classical physics. The independent effect of mind on the brain has been one of the challenging issues in the history of science and philosophy. In some recent mind-brain interaction models, the direct influence of mind on matter is either not accepted (as in Stapp's model) or not clear, and there have not been any clear mechanism for it (as in Penrose-Hameroff's model or in Eccles's model). In this manuscript we propose a model and mechanism for mind's effect on the matter using an extended Bohmian...
The novel soliton solutions for the conformable perturbed nonlinear Schrödinger equation
, Article Modern Physics Letters B ; Volume 36, Issue 8 , 2022 ; 02179849 (ISSN) ; Pashrashid, A ; Gómez Aguilar, J. F ; Akinyemi, L ; Rezazadeh, H ; Sharif University of Technology
World Scientific
2022
Abstract
The sub-equation method is implemented to construct exact solutions for the conformable perturbed nonlinear Schrödinger equation. In this paper, we consider three different types of nonlinear perturbations: The quadratic-cubic law, the quadratic-quartic-quintic law, and the cubic-quintic-septic law. The properties of the conformable derivative are discussed and applied with the help of a suitable wave transform that converts the governing model to a nonlinear ordinary differential equation. Furthermore, the order of the expected polynomial-type solution is obtained using the homogeneous balancing approach. Dark and singular soliton solutions are derived. © 2022 World Scientific Publishing...
Dissociation of C-H molecular bond of methane by pulse shaped ultra-intense laser field
, Article Chemical Physics Letters ; Volume 560 , 2013 , Pages 60-65 ; 00092614 (ISSN) ; Irani, E ; Navid, H. A ; Dehghani, Z ; Anvari, A ; Sadighi Bonabi, R ; Sharif University of Technology
2013
Abstract
The effects of laser field and laser pulse width on the dissociation probability of C-H bond of CH4 have been investigated. Calculation of time dependent Schrödinger equation by grid spectral method is carried out and it is produced optimistic results in comparison to the earlier Quasi-classical calculations. The results show that there is an excellent match with experimental data. In this work, a number of results in the emerging field of laser with intensity of I = 8 × 1013 W cm-2 and pulse duration of 100 fs are presented. The present modulated field leads to more than 20% improvement in the dissociation probability
No-faster-than-light-signaling implies linear evolution. A re-derivation
, Article European Journal of Physics ; Volume 36, Issue 5 , August , 2015 ; 01430807 (ISSN) ; Hejazi, K ; Sharif University of Technology
Institute of Physics Publishing
2015
Abstract
There is a growing interest, both from the theoretical as well as experimental side, to test the validity of the quantum superposition principle, and of theories which explicitly violate it by adding nonlinear terms to the Schrödinger equation. We review the original argument elaborated by Gisin (1989 Helv. Phys. Acta 62 363), which shows that the non-superluminal-signaling condition implies that the dynamics of the density matrix must be linear. This places very strong constraints on the permissible modifications of the Schrödinger equation, since they have to give rise, at the statistical level, to a linear evolution for the density matrix. The derivation is done in a heuristic way here...
Critical slowing down of multiatom entanglement by Rydberg blockade
, Article Physical Review A ; Volume 98, Issue 2 , 2018 ; 24699926 (ISSN) ; Mølmer, K ; Sharif University of Technology
American Physical Society
2018
Abstract
Laser excitation pulses that lead to perfect adiabatic state transfer in an ensemble of three-level ladder atoms lead to highly entangled states of many atoms if their highest excited state is subject to Rydberg blockade. Solution of the Schrödinger equation shows that it is increasingly difficult to ensure the adiabatic evolution as the number of atoms increases. A diminishing energy gap, significant variations in collective observables, and increased work fluctuations link the critical slowing down of the adiabatic evolution with a quantum-phase-transition-like behavior of the system. © 2018 American Physical Society