Net current generation in a 1D quantum ring at zero magnetic field

Gylfadóttir, Sigríður Sif; Niţă, M.; Guðmundsson, Viðar; Manolescu, Andrei

doi:10.1016/j.physe.2004.12.002

Cited by 20 publications

(19 citation statements)

References 8 publications

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“…͑3͒ as the lattice constant for graphene. These are again very high energies and field intensities when com- pared to actual experimental conditions ͑the ac field are normally in the terahertz range 24 for the effects under scrutiny͒. Nevertheless, the high absolute values for the ac-field intensity and photon energy also scale down for larger systems.…”

Section: Numerical Results: Landau-level Replicas and Field-indumentioning

confidence: 77%

Quasienergy spectra of graphene dots in intense ac fields: Field anisotropy and photon-dressed quantum rings

2009

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A graphene quantum dot under intense ac field and static low magnetic field is investigated. From a tight-binding perspective, applying a Fourier-Floquet transformation and renormalization process, we observe that graphene-intrinsically anisotropic-reveals field polarization signatures in the quasidensity of states. For the ac field polarized along the armchair direction, the dressed electronic structure shows an emergent property: an ac-field-induced quantum ring. This is inferred by the orientation-dependent formation of a miniband of energy states periodically modulated with increasing magnetic field, exactly analogous to the behavior of a quantum-ring spectrum.

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Section: Numerical Results: Landau-level Replicas and Field-indumentioning

confidence: 77%

Quasienergy spectra of graphene dots in intense ac fields: Field anisotropy and photon-dressed quantum rings

2009

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“…Nanostructures with novel geometries have become the subject of a large body of experimental and theoretical work [1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23]. Many of the fabricated structures exhibit curvature on the nanoscale making once purely theoretical investigations of quantum mechanics on curved and reduced dimensionality surfaces relevant to device modelling.…”

Section: Introductionmentioning

confidence: 99%

Coupling curvature to a uniform magnetic field: An analytic and numerical study

Encinosa

2006

Phys. Rev. A

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The Schrodinger equation for an electron near an azimuthally symmetric curved surface Σ in the presence of an arbitrary uniform magnetic field B is developed. A thin layer quantization procedure is implemented to bring the electron onto Σ, leading to the well known geometric potential V C ∝ h 2 − k and a second potential that couples A N , the component of A normal to Σ to mean surface curvature, as well as a term dependent on the normal derivative of A N evaluated on Σ. Numerical results in the form of ground state energies as a function of the applied field in several orientations are presented for a toroidal model.

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“…of duration ∼ Γ −1 and amplitude A [12]. n = 1, 2 describes the multipole order of the second component, while the dephasing angle φ between the two components makes the external perturbation asymmetric.…”

Section: The Time Evolutionmentioning

confidence: 99%

Nonadiabatic generation of a pure spin current in a one-dimensional quantum ring with spin-orbit interaction

et al. 2011

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We demonstrate the theoretical possibility of obtaining a pure spin current in a 1D ring with spin-orbit interaction by irradiation with a non-adiabatic, two-component terahertz laser pulse, whose spatial asymmetry is reflected by an internal dephasing angle φ. The stationary solutions of the equation of motion for the density operator are obtained for a spin-orbit coupling linear in the electron momentum (Rashba) and used to calculate the time-dependent charge and spin currents. We find that there are critical values of φ at which the charge current disappears, while the spin current reaches a maximum or a minimum value.

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Net current generation in a 1D quantum ring at zero magnetic field

Cited by 20 publications

References 8 publications

Quasienergy spectra of graphene dots in intense ac fields: Field anisotropy and photon-dressed quantum rings

Quasienergy spectra of graphene dots in intense ac fields: Field anisotropy and photon-dressed quantum rings

Coupling curvature to a uniform magnetic field: An analytic and numerical study

Nonadiabatic generation of a pure spin current in a one-dimensional quantum ring with spin-orbit interaction

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