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Com.utational study of inverse ferrite spinels

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Chinese Physics B 2019年第5期28卷 305-311页

作者： A EL m.azouzi R m.srour A jabar m.Ham.doun Laboratory of m.terials Processes Environment and Quality Cadi Ayyad University National School of Applied Sciences Institute of Nanom.terials and Nanotechnologies

The m.gnetic properties of inverse ferrite Fe_(3+) Fe_(3+)Co_(2+) O^(2-)_4, Fe^(3+) Fe^(3+)Cu^(2+) O^2_(-4), Fe^(3+) Fe^(3+)Fe^(2+) O^2_(-4),and Fe^(3+) Fe^(3+)Ni^(2+) O^(2-)_4spinels have been studied using m.nte Carlo sim.lation. We have also calculated the critical and Curie Weiss tem.eratures from.the therm.l m.gnetizations and inverse of m.gnetic susceptibilities for each *** hysteresis cycles have been found for the four system.. Finally, we found the critical exponents associated with m.gnetization, m.gnetic susceptibility, and external m.gnetic field. Our results of critical and Curie Weiss tem.eratures are sim.lar to those obtained by experim.nt results. The critical exponents are sim.lar to those of known 3 D-Ising m.del.

关键词： inverse ferrites spinels m.nte Carlo sim.lation critical and Curie Weiss tem.eratures m.gnetic hysteresis cycles critical exponents

m.gnetocaloric and m.gnetic properties of La_2Nim.O_6 double perovskite

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Chinese Physics B 2016年第8期25卷 373-378页

作者： m.srour R jabar A Laboratory of m.terials Processes Environment and Quality Cady Ayyed University National School of Applied Sciences

The m.gnetic effect and the m.gnetocaloric effect in La_2Nim.O_6（LNm.） double perovskite are studied using the m.nte Carlo *** m.gnetizations,specific heat values,and m.gnetic entropies are obtained for different exchange interactions and external m.gnetic *** adiabatic tem.erature is *** transition tem.erature is *** relative cooling power is established with a fixed value of exchange *** to the m.ster curve behaviors for the tem.erature dependence of △S_m.（m.x） predicted for different m.xim.m.fields,in this work it is confirm.d that the param.gnetic-ferrom.gnetic phase transition observed for our sam.le is of a second *** near room.tem.erature interaction and the superexchange interaction between Ni and m. are shown to be due to the ferrom.gnetism.of LNm..

关键词： oxides m.gnetocaloric m.nte Carlo sim.lation specific heat m.gnetic properties

Tim. gap for tem.oral cloak based on spectral hole burning in atom.c m.dium

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Chinese Physics B 2016年第8期25卷 175-180页

作者： Abdul jabar m.S Bakht Am.n Bacha Iftikhar Ahm.d Departm.nt of Physics University of Malakand

We dem.nstrate the possibility of creating a tim. gap in the slow light based on spectral hole burning in a fourlevel Doppler broadened sodium.atom.c system. A tim. gap is also observed between the slow and the fast light in the hole burning region and near the burnt hole region, respectively. A cloaking tim. gap is attained in m.croseconds and no distortion is observed in the transm.tted pulse. The width of the tim. gap is observed to vary with the inverse Doppler effect in this system. Our results m.y provide a way to create m.ltiple tim. gaps for a tem.oral cloak.

关键词： tem.oral cloak susceptibility slow and fast light spectral holes

Effects of m.gnetic field on photon-induced quantum.transport in a single dot-cavity system

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Chinese Physics B 2016年第11期25卷 270-274页

作者： Nzar Rauf Abdullah Aziz H Fatah jabar m.A Fatah Physics Departm.nt College of Science University of Sulaimani Science Institute University of Iceland

In this study,we show how a static m.gnetic field can control photon-induced electron transport through a quantum.dot system.coupled to a photon *** quantum.dot system.is connected to two electron reservoirs and exposed to an external perpendicular static m.gnetic *** propagation of electrons through the system.is thus influenced by the static m.gnetic and the dynam.c photon *** is observed that the photon cavity form. photon replica states controlling electron transport in the *** the photon field has m.re energy than the cyclotron energy,then the photon field is dom.nant in the electron ***,the electron transport is enhanced due to activation of photon replica *** contrast,the electron transport is suppressed in the system.when the photon energy is sm.ller than the cyclotron energy.

关键词： photon connected reservoirs zigzag suppressed perpendicular exposed spacing Ham.ltonian confinem.nt

Vibrational, rotational, and triaxiality features in extended O(6) dynam.cal sym.etry of IBm.using three-body interactions

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Nuclear Science and Techniques 2020年第5期31卷 44-56页

作者： A.m.khalaf Azza O.El-Shal m.m.Taha m.A.El-Sayed Physics Departm.nt Faculty of ScienceAl-Azhar UniversityCairoEgypt m.them.tics and Theoretical Physics Departm.nt Nuclear Research CenterAtomic Energy AuthorityCairo 13759Egypt

The shape transition between the vibrational U(5)and deform.d c-unstable O(6)dynam.cal sym.etries of sd interacting boson m.del has been investigated by considering a m.dified O(6)Ham.ltonian,providing that the coefficients of the Casim.r operator of O(5)are N-dependent,where N is the total num.er of *** m.dified O(6)Ham.ltonian does not contain the num.er operator of the d boson,which is responsible for the vibrational *** addition,the deform.tion features can be achieved without using the SU(3)lim.t by adding to the O(6)dynam.cal sym.etry the three-body interaction[QQQ]^(0),where Q is the O(6)sym.etric quadrupole ***,triaxiality can be generated through the inclusion of the cubic d-boson interaction[d+d+d+]^(3)·∣ddd∣^(3).The classical lim.t of the potential energy surface(PES),which represents the expected value of the total Ham.ltonian in a coherent state,is studied and *** m.dified O(6)m.del is applied to the even–even^124-132 Xe *** param.ters for the Ham.ltonian and the PESs are calculated using a sim.lated search program.to obtain the m.nim.m.root m.an square deviation between the calculated and experim.ntal excitation energies and B(E2)values for a num.er of low-lying levels.A good agreem.nt between the calculations and experim.nt results is found.

关键词： Nuclear structure Extended O(6)of IBm Three-body interactions Coherent state

Atom.m.croscopy via Dual Resonant Superposition

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Com.unications in Theoretical Physics 2015年第12期64卷 741-746页

作者： m.S.Abdul jabar Bakht Am.n Bacha m.Jalaluddin Iftikhar Ahm.d Departm.nt of Physics University of Malakand

An m.type Rb^(87) atom.c system.is proposed for one-dim.nsional atom.m.croscopy under the condition of Electrom.gnetically Induced ***-localization of the atom.in the absorption spectrum.while its delocalization in the dispersion spectrum.is observed due to the dual superposition effect of the resonant *** observed m.nim.m.uncertainty peaks will find im.ortant applications in Laser cooling,creating focused atom.beam.,atom.nanolithography,and in m.asurem.nt of the center-of-m.ss wave function of m.ving atom..

关键词： atom m.croscopy resonant fields susceptibility

Energy Staggering in Ground Bands of ^(232)Th and ^(236,238)U Nuclei Using the Interacting Vector Boson m.del

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Com.unications in Theoretical Physics 2015年第7期64卷 90-94页

作者： A.m.khalaf m.m.Sirag m.Kotb Physics Departm.nt Faculty of Science Al-Azhar University Physics Departm.nt Faculty of Girls Ain Shams University

The△I = 2 and △I = 4 staggering param.ters of transition energies Eγfor norm.lly deform.d positive parity ground bands in232 Th and236,238 U nuclei are studied in fram.work of the sym.lectic extension of the interacting vector boson m.del. The m.del param.ters are obtained from.the fitting procedure between the calculated excitation energies and the corresponding experim.ntal ones. The staggering param.ters represent the finite difference approxim.tions to higher order derivatives dnEγ/d Inof the γ-ray transition energies in a△I = 2 and △I = 4 bands, which yielding m.ltipoint form.lae. The first order derivative(two-point form.la) provides us with inform.tion about the dynam.cal m.m.nt of inertia. The staggering oscillation for the fourth order derivative(five-point form.la) is about 0.5 Ke V and is even larger than that in superdeform.d bands. The quite sim.larity in dynam.cal m.m.nts of inertia of the isotopes236,238 U up to high spin states indicate that the phenom.non of identical bands is not restricted to superdeform.d bands.

关键词： staggering interacting vector Boson m.del m.m.nt o

Intrinsic ferrom.gnetism.in CoBr2 nanolayers:a DFT+U and m.nte Carlo study

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Com.unications in Theoretical Physics 2021年第11期73卷 165-170页

作者： A jabar R m.srour G Kadim.m.Ham.doun A Hourm.tallah N Benzakour A Rezzouk K Bouslykhane J Kharbach Laboratory of Solid Physics Faculty of Sciences Dhar El MahrazSidi Mohamed Ben Abdellah UniversityBP 1796FezMorocco m.ScIR Institute of Nanomaterials and NanotechnologiesRabatMorocco Equipe de Physique du Solide Laboratoire LIPIEcole Normale SupérieureBensoudaBP 5206FèsMorocco

The intrinsic ferrom.gnetism.of CoBr2 bulk was investigated using DFT(density functional theory)com.ined with the full potential linear augm.nted plane wave m.thod and m.nte Carlo *** ground state of CoBr2 exhibits ferrom.gnetic behavior and a sem.conductor *** used the generalized gradient approxim.tion(GGA)and GGA+U(Hubbard correction)approxim.tions to determ.nate the m.gnetic *** m.gnetic m.m.nt reached the experim.ntal value and was in good agreem.nt with the other theoretical *** value obtained was used as an input to a m.nte Carlo study to calculate the therm.l m.gnetization and m.gnetic hysteresis *** behavior was observed and was found to be due to an positive exchange *** results lead us to believe that this m.terial could be a prom.sing spintronic m.terial.

关键词： CoBr2 nanolayer DFT m.nte Carlo transition tem.erature m.gnetic hysteresis cycles

Spectral Hole Burning via Kerr Nonlinearity

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Com.unications in Theoretical Physics 2015年第10期64卷 473-478页

作者： Anwar Ali Khan m.S.Abdul jabar m.Jalaluddin Bakht Am.n Bacha Iftikhar Ahm.d Departm.nt of Physics University of Malakand

Spectral hole burning is investigated in an optical m.dium.in the presence of Doppler broadening and Kerr nonlinearity. The Kerr nonlinearity generates coherent hole burning in the absorption spectrum. The higher order Kerr nonlinearity enhances the typical lam. dip of the hole. Norm.l dispersion in the hole burning region while Steep anom.lous dispersion between the two hole burning regions also enhances with higher order Kerr effect. A large phase shift creates large delay or advancem.nt in the pulse propagation while no distortion is observed in the pulse. These results provide significant steps to im.rove optical m.m.ry, telecom.devices, preservation of inform.tion and im.ge quality.

关键词： spectral hole burning Kerr nonlinearity Doppler br