Institute of Nanomaterials and Nanotechnology MAScIR

Rabat, Morocco

Institute of Nanomaterials and Nanotechnology MAScIR

Rabat, Morocco
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Drissi L.B.,Institute of Nanomaterials and Nanotechnology MAScIR | Drissi L.B.,International Center for Theoretical Physics | Mhamdi H.,Institute of Nanomaterials and Nanotechnology MAScIR | Mhamdi H.,Mohammed V University | And 2 more authors.
Journal of High Energy Physics | Year: 2011

Boriçi-Creutz (BC) model describing the dynamics of light quarks in lattice QCD has been shown to be intimately linked to the four dimensional extension of 2D graphene refereed below to as four dimensional graphene (4D-graphene). Borrowing ideas from the field theory description of the usual 2D graphene, we study in this paper the anomalous quantum Hall effect (AQHE) of the BC fermions in presence of a constant background field strength F μv with a special focuss on the case Fμv = Bεμv34 + Eε12μvwith B and E two real moduli and detFμv = B2×E2. First, we revisit the anomalous 2D graphene by using QFT method. Then, we consider the AQHE of BC fermions for both regular detFμv 6= 0 and singular detF μv = 0 cases. We show, amongst others, that the exact solutions of the BC fermions coupled to constant Fμv have a 5D interpretation; and the filling factor ?BC of the BC model coupled to constant F μv is given by 24(2N+1)(2M+1)/2 with N, M positive integers. Others features, such as FQCD μv 6= 0 and the extension of the obtained results to the lattice fermions like Karsten-Wilzeck (KW) fermions and naïve ones, are also discussed. © 2011 SISSA.

Drissi L.B.,Institute of Nanomaterials and Nanotechnology MAScIR | Drissi L.B.,International Center for Theoretical Physics | Benyoussef A.,Institute of Nanomaterials and Nanotechnology MAScIR | Benyoussef A.,Mohammed V University | And 3 more authors.
Journal of Magnetism and Magnetic Materials | Year: 2011

The magnetic properties of Mn-doped ZnO semiconductor have been investigated using the Monte Carlo method within the Ising model. The temperature dependences of the spontaneous magnetization, specific heat and magnetic susceptibility have been constructed for different concentrations of magnetic dopant Mn and different carrier concentrations. The exact values of Mn concentration and carrier concentration at which high temperature transition occurs are determined. An alternative for the explanation of some controversies concerning the existence and the nature of magnetism in Mn diluted in ZnO systems is given. Other features are also studied. © 2011 Elsevier B.V. All rights reserved.

Naji S.,Mohammed V University | Naji S.,Ibb University | Ziti S.,Mohammed V University | Belhaj A.,Sultan Moulay Slimane University | And 7 more authors.
Journal of Superconductivity and Novel Magnetism | Year: 2015

Borrowing ideas from Lie algebras, we propose a new nanotube model based on a double hexagonal geometry appearing in the G2 Lie symmetry. This structure involves two hexagons of unequal side length at angle 30 ∘ producing (3×3)R30∘$(\sqrt {3}~\times ~\sqrt {3})R30~^{\circ }$ and (1 × 1) geometries. In this configuration system, the principal unit cell contains 12 sites instead of only 6 ones, arising in the single hexagonal structure on which the graphene-like models are based. More precisely, we engineer a superlattice model based on periodic bilayers consisting of particles with the spins σ=±12$\sigma =\pm \frac {1}{2}$ having two possible states, placed at sites of the double hexagonal structure. Then, we investigate the phase diagrams and the magnetic properties using the mean field method. In particular, we find six stable phases required by a global Z2 symmetry associated with the spin values placed at the site of the G2 double hexagonal structure. © 2015, Springer Science+Business Media New York.

Mamouni N.,Université Ibn Tofail | Belaiche M.,Laboratoire Of Magnetisme | Belaiche M.,Institute of Nanomaterials and Nanotechnology MAScIR | Benyoussef A.,Université Ibn Tofail | And 7 more authors.
Chinese Physics B | Year: 2011

Electronic and magnetic structures of zinc blende ZnO doped with V impurities are studied by first-principles calculations based on the Korringa - Kohn - Rostoker (KKR) method combined with the coherent potential approximation (CPA). Calculations for the substitution of O by N or P are performed and the magnetic moment is found to be sensitive to the N or P content. Furthermore, the system exhibits a half-metallic band structure accompanied by the broadening of vanadium bands. The mechanism responsible for ferromagnetism is also discussed and the stability of the ferromagnetic state compared with that of the paramagnetic state is systematically investigated by calculating the total energy difference between them by using supercell method. © 2011 Chinese Physical Society and IOP Publishing Ltd.

Al Mamari K.,Mohammed V University | Ennajih H.,Mohammed V University | Bouhfid R.,Institute of Nanomaterials and Nanotechnology MAScIR | Essassi E.M.,Mohammed V University | And 2 more authors.
Acta Crystallographica Section E: Structure Reports Online | Year: 2012

The molecule of the title compound, C30H32N 4O2, lies on a twofold rotation axis that passes through the mid-points of the C - C bonds of the piperazine ring, which adopts a chair conformation. The pyrrolidine ring that is fused to the piperazine ring adopts an envelope conformation (in which the N atom represents the flap). The indoline fused-ring system is nearly planar (r.m.s. deviation = 0.044 Å); the two symmetry-related indoline fused-rings systems are aligned at 71.44 (3)°.

Al Mamari K.,Mohammed V University | Ennajih H.,Mohammed V University | Bouhfid R.,Institute of Nanomaterials and Nanotechnology MAScIR | Essassi E.M.,Mohammed V University | And 2 more authors.
Acta Crystallographica Section E: Structure Reports Online | Year: 2012

In the molecule of the title compound, C30H30Br 2N4O2, the piperazine ring adopts a chair conformation. The pyrrolidine rings that are fused to the piperazine ring adopt envelope conformations (in which the N atom represents the flap). The indoline fused-ring systems are nearly planar (r.m.s. deviations = 0.009 and 0.019 Å); the two fused rings are aligned at 60.63 (6)°.

Al Mamari K.,Mohammed V University | Ennajih H.,Mohammed V University | Bouhfid R.,Institute of Nanomaterials and Nanotechnology MAScIR | Essassi E.M.,Mohammed V University | And 2 more authors.
Acta Crystallographica Section E: Structure Reports Online | Year: 2012

In the title compound, C38H34Cl2N 4O2, the piperazine ring adopts a chair conformation. The pyrrolidine rings that are fused to the piperazine ring adopt envelope conformations (in which the C atoms connecting the two rings represent the flap). The indoline ring systems are approximately planar (r.m.s. deviations = 0.026 and 0.034 Å) and are aligned at a dihedral angle of 54.98 (3)°.

Rida M.,Mohammed V University | Alsubari A.,Mohammed V University | Essassi E.M.,Mohammed V University | Zouihri H.,Institute of Nanomaterials and Nanotechnology MAScIR | And 2 more authors.
Acta Crystallographica Section E: Structure Reports Online | Year: 2011

In the title compound, C17H16N2O 3, the seven-membered diazepine ring adopts a boat conformation with the hy-droxy-substituted C atom at the prow and fused benzene ring C atoms at the stern. The phenyl substituent occupies an equatorial position. The amino group of the ring system is a hydrogen-bond donor to the oxo O atom of an inversion-related molecule, and the hy-droxy group is a hydrogen-bond donor to the acetyl O atom of another inversion-related molecule. The two hydrogen bonds generate a ribbon motif parallel to [10 ] in the crystal structure.