Theoretical studies of the effects of a magnetic field on excitonic nonlinear optical properties of quantum wires

A. Balandin and S. Bandyopadhyay
Phys. Rev. B 54, 5721 – Published 15 August 1996
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Abstract

The magnetic-field dependence of the third-order excitonic nonlinear susceptibility χ(3) in a quantum wire is explored within the rotating wave approximation. Both the real and imaginary parts of χ(3), arising from population saturation of the excitonic state under optical pumping, are calculated for a GaAs wire as a function of magnetic field and pump-probe detuning frequencies. The imaginary part of χ(3) exhibits a negative peak associated with the bleaching of the excitonic resonance and a positive, broad, off-resonance absorption peak associated with biexciton formation. The amplitude, line shape, and spectral frequency of both these peaks can be modulated by a magnetic field which indicates the possibility of using such a field to probe the mechanism underlying optical nonlinearity in a quantum wire. Furthermore, the field can also be used to tune the optical nonlinearity over a range of frequencies which has device applications. © 1996 The American Physical Society.

  • Received 12 February 1996

DOI:https://doi.org/10.1103/PhysRevB.54.5721

©1996 American Physical Society

Authors & Affiliations

A. Balandin and S. Bandyopadhyay

  • Department of Electrical Engineering, University of Nebraska, Lincoln, Nebraska 68588

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Vol. 54, Iss. 8 — 15 August 1996

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