Determining band offsets with triple quantum-well structures

Bryant, Garnett W.; Bradshaw, J. L.; Leavitt, Richard P.; Tobin, M. S.; Pham, John

doi:10.1063/1.109676

Cited by 10 publications

(2 citation statements)

References 13 publications

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“…To model GaAs/AlGaAs structures, we use ⑀ϭ13.1,m e ϭ0.067 and a conduction band/valence band offset ratio of 62:38. 34 Other similar choices for ⑀ to model polarization effects and for m e to model band parabolicity give similar results for the exciton redshifts provided that the same model is used to find the exciton states in both wells and wires. We consider two models for the hole states.…”

Section: A Exciton States At Bä0mentioning

confidence: 91%

T-shaped quantum wires in magnetic fields: Weakly confined magnetoexcitons beyond the diamagnetic limit

Bryant

Band

2001

Phys. Rev. B

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Optical excitations of magnetoexcitons in T-shaped wires are calculated and compared with experiment. We find the single-particle states for electrons and holes confined to a wire in a magnetic field and use these states as a basis for calculations of magnetoexciton states. We accurately reproduce the field dependence of the exciton states and explain the small, field-induced, energy shifts that are observed for these states. The shifts are small because the T-junction provides weak confinement, rather than strong quantum confinement. Diamagnetic shifts calculated from perturbation theory fail to describe the experimental results. We determine when perturbation theory is valid for these nanostructures and which gauge should be used to give the diamagnetic shift that best reproduces the field dependence at low fields.

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