Magnetic field control of the intraband optical absorption in two-dimensional quantum rings

Abstract

Linear and nonlinear optical absorption coefficients of the two-dimensional semiconductor ring in the perpendicular magnetic field $\mathbf{B}$ are calculated within independent electron approximation. Characteristic feature of the energy spectrum are crossings of the levels with adjacent nonpositive magnetic quantum numbers as the intensity $B$ changes. It is shown that the absorption coefficient of the associated optical transition is drastically decreased at the fields corresponding to the crossing. Proposed model of the Volcano disc allows to get simple mathematical analytical results, which provide clear physical interpretation. An interplay between positive linear and intensity-dependent negative cubic absorption coefficients is discussed; in particular, critical light intensity at which additional resonances appear in the total absorption dependence on the light frequency, is calculated as a function of the magnetic field and levels' broadening.

17 pages, 5 figures

References in corpus (2)

• Electron tunneling spectroscopy of a quantum antidot in the quantum Hall regime
• Strain and band-mixing effects on the excitonic Aharonov-Bohm effect in In(Ga)As/GaAs ringlike quantum dots

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• One-dimensional pseudoharmonic oscillator: classical remarks and quantum-information theory
• Quantum-information theory of a Dirichlet ring with Aharonov-Bohm field