Dynamical spin polarization in single-layer graphene

Aghel, F.; Safaiee, R.; Golshan, M.M.

doi:10.1016/j.physe.2013.06.010

Cited by 6 publications

(3 citation statements)

References 37 publications

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“…where the factor β ≈ 21.5 incorporate the quasienergy-and momentum-dependent normalization [21] factor which is to constrain the valley polarization into [−1, 1] and obtain zero time-average value.…”

Section: Dynamical Polarizationmentioning

confidence: 99%

Anomalous Rabi oscillation and related dynamical polarizations under the off-resonance circularly polarized light

Wu¹

2018

Preprint

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We investigate the photoinduced effect to the silicene, which is a topological insulator, by the circularly polarized light in off-resonance regime with a frequency much larger than the critical value (also much larger than the frequency about the particle-hole pair creation), and with a perpendicular electric field. The anomalous Rabi frequency which is a non-linear optical, arised by the off-resonance circularly polarized light. The temporal behavior of the pseudospin, valley, and spin degrees of freedom, which are momentum-and quasienergy-dependent, are explored. The anomalous Rabi oscillation is also related to the photoinduced topological phase transition between the topological trivial state with zero Chern number and gapped edge state and the topological nontrivial state with nonzero Chern number and gapless edge state. The off-resonance laser can also induce the topological phase transition by manipulating the energy band structure, rather than excite the atoms to the high quantum-number states like the resonance light. The exchange between the radiation driving field and the two-component dynamical polarizations with the dipole oscillation, plays a important role in the determination of the out-of-plane spin polarization and the motion of the center of mass, which can induced a collapse-and-revival pattern under a certain condition. The Rabi oscillation observed in the motion of the center of mass in a laser-induced harmonic potential can be used to detect the time evolution of the atom polulation. Our results can also be applied to the other two-dimension low-energy Dirac models or the surface of the three-dimension topological insulators, and even the weyl semimetal with the photoinduced topological phase transition.

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Section: Dynamical Polarizationmentioning

confidence: 99%

Anomalous Rabi oscillation and related dynamical polarizations under the off-resonance circularly polarized light

Wu¹

2018

Preprint

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“…Although analytical expressions for the expansion coecients in equation ( 8) are available in the literature (see, for instance, [15]) and since we at last resort to numerical computation, for the sake of brevity, we do not state them here. We shall, nonetheless, comment on the expansion coecients, ( )…”

Section: Partially-transposed π-Electron's Thermal Density Matrixmentioning

confidence: 99%

“…Graphene, a two-dimensional single layer of carbon with a honeycomb structure in which the so-called π-electrons behave as quasi-Dirac particles, has been the subject of immense investigations [10,[14][15][16]. The vast interest in graphene stems from its very unusual electronic structure, which leads to high electronic mobility, high spin relaxation time, large spin relaxation length, etc [17][18][19][20].…”

Section: Introductionmentioning

confidence: 99%

Thermal free entanglement of π-electronic spin and Landau-sublattice states in Rashba monolayer graphene

2016

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Free entanglement-the milestone of any quantum information processing scheme-among the π-electronic spin and its spatial states in graphene, as a function of temperature, is the main concern of the present report. It is assumed that a perpendicular magnetic field generates the Landau levels so that a coupling with the pseudo-spin (sublattice) states is enacted. Moreover, the pseudo-Rashba spin-orbit interaction (SOI), responsible for the coupling of spin and sublattice states, is also taken into account. From the structure of the total Hamiltonian, we introduce a Casimir operator which, in due turn, assists the development of a simple but ecient algorithm for our numerical computation. We then proceed by constructing the thermal density operator, its partially transposed one and, thereby, compute the negativity, the proper measure of free hybrid entanglement, at any temperature. Our results show that the negativity is nonvanishing at absolute zero temperature due to the fact that the ground state is an entangled one. Moreover, our results indicate that the negativity, at certain temperatures, exhibits maxima. The temperatures at which the entanglement (free) is maximal strongly depend on the magnetic field and pseudo-Rashba spin-orbit strength; decreasing the magnetic field and/or increasing the pseudo-Rashba parameter (PRP) enhances the maximal entanglement monotonically. As the temperature increases, however, it is shown that the negativity decreases asymptotically to zero. As a result, there exists distillable entanglement amid the π-electronic spin and its spatial states in graphene at any finite temperature.

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Armchair graphene nanoribbons under shear strain

Zhang

et al. 2014

Physica E: Low-dimensional Systems and Nanostructures

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Dynamical spin polarization in single-layer graphene

Cited by 6 publications

References 37 publications

Anomalous Rabi oscillation and related dynamical polarizations under the off-resonance circularly polarized light

Anomalous Rabi oscillation and related dynamical polarizations under the off-resonance circularly polarized light

Thermal free entanglement of π-electronic spin and Landau-sublattice states in Rashba monolayer graphene

Armchair graphene nanoribbons under shear strain

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