Researcher:
Almasri, Mohammad Walid

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PhD Student

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Mohammad Walid

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Almasri

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Almasri, Mohammad Walid
Almasri, Muhammet Valıt

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2019 - 201912020 - 20212

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Researcher Of Publications: search.filters.isAuthorOfPublication.2fc68e86-1430-4a86-85bc-7dab2ab6fcc8

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Now showing 1 - 3 of 3
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    Supersymmetry of PT-symmetric tridiagonal hamiltonians
    (World Scientific Publ Co Pte Ltd, 2021) N/A; Almasri, Mohammad Walid; PhD Student; Graduate School of Sciences and Engineering; N/A
    We extend the study of supersymmetric tridiagonal Hamiltonians to the case of non-Hermitian Hamiltonians with real or complex conjugate eigenvalues. We find the relation between matrix elements of the non-Hermitian Hamiltonian H and its supersymmetric partner H+ in a given basis. Moreover, the orthogonal polynomials in the eigenstate expansion problem attached to H+ can be recovered from those polynomials arising from the same problem for H with the help of kernel polynomials. Besides its generality, the developed formalism in this work is a natural home for using the numerically powerful Gauss quadrature techniques in probing the nature of some physical quantities such as the energy spectrum of PT-symmetric complex potentials. Finally, we solve the shifted PT-symmetric Morse oscillator exactly in the tridiagonal representation.
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    Axial-anomaly in noncommutative QED and Pauli-Villars regularization
    (World Scientific Publ Co Pte Ltd, 2019) N/A; Almasri, Mohammad Walid; PhD Student; Graduate School of Sciences and Engineering; N/A
    We calculate the U(1) axial-anomaly in two and four dimensions using a modified path integral method coupled to a Pauli-Villars regulator field in the noncommutative QED. Pauli-Villars regularization method provides us with unambiguous way to connect the modified path integral formalism with perturbative axial Ward identities at each step of calculations.
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    SU(4) description of bilayer skyrmion-antiskyrmion pairs
    (Institute of Physics (IOP) Publishing, 2020) Department of Physics; Almasri, Mohammad Walid; PhD Student; Department of Physics; College of Sciences
    The antiferromagnetic coupling and entanglement between skyrmion lattices are treated in magnetic bilayer systems. We first formulate the problem of large bilayer skyrmions using the-theory. We have considered bilayer skyrmions under the presence of Dzyaloshinskii-Moriya (DMI) and Zeeman interactions confined in a two-dimensional chiral magnet such as Fe0.5Co0.5Si. We parametrize bilayer skyrmions using the SU(4) representation, and represent each skyrmion and antiskyrmion using the Schmidt decomposition. The reduced density matrices for skyrmion and antiskyrmion have been calculated. The conditions for maximal, partial entanglement and separable bilayer skyrmions are presented. Our results can be used for generating entanglement in systems with a large number of spins.