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The Optical Excitonic Aharonov-Bohm Effect in a Few Nanometer Wide Type-I Nanorings

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Tadić M., Arsoski V., Čukarić N., Peeters F.

issue 6

974-977

The optical excitonic Aharonov-Bohm effect in type-I three-dimensional (In,Ga)As/GaAs nanorings is theoretically explored. The single-particle states of the electron and the hole are extracted from the effective mass theory in the presence of inhomogeneous strain, and an exact numerical diagonalization approach is used to compute the exciton states and the oscillator strength f_{x} for exciton recombination. We studied both the large lithographically-defined and small self-assembled rings. Only in smaller self-assembled nanorings we found optical excitonic Aharonov-Bohm effect. Those oscillations are established by anticrossings between the optically active exciton states with zero orbital momentum. In lithographically defined rings, whose average radius is 33 nm, f_{x} shows no oscillations, whereas in the smaller self-assembled nanoring with average radius of 11.5 nm oscillations in f_{x} for the ground exciton state are found as function of the magnetic field that is superposed on a linear dependence. These oscillations are smeared out at finite temperature, thus photoluminescence intensity exhibits step-like variation with magnetic field even at temperature as small as 4.2 K.

Interband Optical Properties of Concentric Type-I Nanorings in a Normal Magnetic Field

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Arsoski V., Tadić M., Peeters F.

issue 5

733-737

Two concentric two-dimensional GaAs/(Al,Ga)As nanorings in a normal magnetic field are theoretically studied. The single-band effective mass approximation is adopted for both the electron and the hole states, and the analytical solutions are given. We find that the electronic single particle states are arranged in pairs, which exhibit anticrossings and the orbital momentum transitions in the energy spectrum when magnetic field increases. Their period is essentially determined by the radius of the outer ring. The oscillator strength for interband transitions is strongly reduced close to each anticrossing. We show that an optical excitonic Aharonov-Bohm effect may occur in concentric nanorings.

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2 Acta Physica Polonica A

2 2010

2 Arsoski V.

2 Peeters F.

2 Tadić M.

1 Čukarić N.

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The Optical Excitonic Aharonov-Bohm Effect in a Few Nanometer Wide Type-I Nanorings

Interband Optical Properties of Concentric Type-I Nanorings in a Normal Magnetic Field