Orbital Magnetism of Graphenes

Koshino, Mikito

doi:10.5772/15255

Cited by 4 publications

(4 citation statements)

References 17 publications

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“…As in previous examples, there is a diamagnetic to paramagnetic transition of the logarithmic term at a critical value α c = √ 4 − √ 3 = 0.263, whereas there is a paramagnetic to diamagnetic transition of the second term at α c = √ 12 − √ 11 = 0.147. For α = 0, these expressions coincide with previous results obtained in [16,17]. In [17], the susceptibility was derived from using the analytical form of the effective Landau levels n = B n(n − 1) ( B = eB m * ) that are associated to the lowenergy model.…”

Section: α-T 3 Pseudo-bilayer Modelsupporting

confidence: 79%

“…For α = 0, these expressions coincide with previous results obtained in [16,17]. In [17], the susceptibility was derived from using the analytical form of the effective Landau levels n = B n(n − 1) ( B = eB m * ) that are associated to the lowenergy model. A similar derivation for any α seems difficult to achieve even if the Landau level sequence is known.…”

Section: α-T 3 Pseudo-bilayer Modelsupporting

confidence: 79%

“…where it is necessary to introduce a cutoff scale c [16,17]. As in previous examples, there is a diamagnetic to paramagnetic transition of the logarithmic term at a critical value α c = √ 4 − √ 3 = 0.263, whereas there is a paramagnetic to diamagnetic transition of the second term at α c = √ 12 − √ 11 = 0.147.…”

Section: α-T 3 Pseudo-bilayer Modelmentioning

confidence: 74%

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Tunable orbital susceptibility in α-T₃ tight-binding models

Piéchon

Fuchs

Raoux

et al. 2015

J. Phys.: Conf. Ser.

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We study the importance of interband effects on the orbital susceptibility of three bands α-T3 tight-binding models. The particularity of these models is that the coupling between the three energy bands (which is encoded in the wavefunctions properties) can be tuned (by a parameter α) without any modification of the energy spectrum. Using the gauge-invariant perturbative formalism that we have recently developped [1], we obtain a generic formula of the orbital susceptibility of α-T3 tight-binding models. Considering then three characteristic examples that exhibit either Dirac, semi-Dirac or quadratic band touching, we show that by varying the parameter α and thus the wavefunctions interband couplings, it is possible to drive a transition from a diamagnetic to a paramagnetic peak of the orbital susceptibility at the band touching. In the presence of a gap separating the dispersive bands, we show that the susceptibility inside the gap exhibits a similar dia to paramagnetic transition. arXiv:1502.01976v1 [cond-mat.quant-gas]

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Section: α-T 3 Pseudo-bilayer Modelsupporting

confidence: 79%

Section: α-T 3 Pseudo-bilayer Modelsupporting

confidence: 79%

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Tunable orbital susceptibility in α-T₃ tight-binding models

Piéchon

Fuchs

Raoux

et al. 2015

J. Phys.: Conf. Ser.

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“…As it can be seen, the magnetic intensities of both M-GO hybrids are lower than the pure magnetite NPs, due to the following reasons: (1) presence of graphene, as a diamagnetic material [54], reduces (i.e. dilutes) the superparamagnetic property of the Fe 3 O 4 , (2) nanometric size of the magnetite NPs cause further diminishing of the magnetic property.…”

Section: Magnetic Propertiesmentioning

confidence: 96%

Synthesis and characterization of ultrasound assisted “graphene oxide–magnetite” hybrid, and investigation of its adsorption properties for Sr(II) and Co(II) ions

Tayyebi

Outokesh

Moradi

et al. 2015

Applied Surface Science

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a b s t r a c tMagnetite nanoparticles with a size distribution of 15-21 nm were synthesized and decorated onto surface of graphene oxide by ultrasound assisted precipitation. Size and size distribution of the obtained M-GO hybrid were appreciably finer than the hybrids prepared by stirring method. M-GO is a superparamagnetic material with saturation magnetization of 31 emu g −1 . The Langevin equation was successfully applied for estimation of size of Fe 3 O 4 nanoparticles in M-GO hybrid, with maximum error of 17.5%. The study put forward a formation mechanism for M-GO, based on instrumental analyses. Adsorption isotherms of Sr 2+ and Co 2+ ions, which were fitted by Langmuir monolayer model, displayed two-fold higher capacity for Co 2+ ions, presumably due to its similarity to Fe 2+ (of Fe 3 O 4 component). Uptake of both Co 2+ and Sr 2+ ions were endothermic, and spontaneous, however the former proceeded through inner-shell complex formation, while the latter took place via ion exchange mechanism. Rate of adsorption of Co 2+ was faster, but for both ions, chemical reaction was the rate determining step. Sorption of Sr 2+ and Co 2+ ions greatly increased at pHs above 5, where (1) surface zeta potential changed its sign, and (2) deprotonating reactions at the surface became complete.

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Ground-state magnetic phase diagram of bow-tie graphene nanoflakes in external magnetic field

Szałowski

2013

Journal of Applied Physics

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The magnetic phase diagram of a ground state is studied theoretically for graphene nanoflakes of bow-tie shape and various size in external in-plane magnetic field. The tight-binding Hamiltonian supplemented with Hubbard term is used to model the electronic structure of the systems in question. The existence of the antiferromagnetic phase with magnetic moments localized at the sides of the bow-tie is found for low field and a field-induced spin-flip transition to ferromagnetic state is predicted to occur in charge-undoped structures. For small nanoflake doped with a single charge carrier the low-field phase is ferrimagnetic and a metamagnetic transition to ferromagnetic ordering can be forced by the field. The critical field is found to decrease with increasing size of the nanoflake. The influence of diagonal and off-diagonal disorder on the mentioned magnetic properties is studied. The effect of off-diagonal disorder is found to be more important than this of diagonal disorder, leading to significantly widened distribution of critical fields for disordered population of nanoflakes.

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Orbital Magnetism of Graphenes

Cited by 4 publications

References 17 publications

Tunable orbital susceptibility in α-T₃ tight-binding models

Tunable orbital susceptibility in α-T₃ tight-binding models

Synthesis and characterization of ultrasound assisted “graphene oxide–magnetite” hybrid, and investigation of its adsorption properties for Sr(II) and Co(II) ions

Ground-state magnetic phase diagram of bow-tie graphene nanoflakes in external magnetic field

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Orbital Magnetism of Graphenes

Cited by 4 publications

References 17 publications

Tunable orbital susceptibility in α-T3 tight-binding models

Tunable orbital susceptibility in α-T3 tight-binding models

Synthesis and characterization of ultrasound assisted “graphene oxide–magnetite” hybrid, and investigation of its adsorption properties for Sr(II) and Co(II) ions

Ground-state magnetic phase diagram of bow-tie graphene nanoflakes in external magnetic field

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Tunable orbital susceptibility in α-T₃ tight-binding models

Tunable orbital susceptibility in α-T₃ tight-binding models