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Carrier Diffusion in the Barrier Enabling Formation of Charged Excitons in InAs/GaAs Quantum Dots

100%

Karlsson K., Moskalenko E., Holtz P., Monemar B., Schoenfeld W., Garcia J., Petroff P.

Acta Physica Polonica A

2001

vol. 100

issue 3

387-395

It is demonstrated that the photoluminescence spectra of single self-assembled quantum dots are very sensitive to the experimental conditions, such as excitation energy and crystal temperature. A qualitative explanation is given in terms of the effective diffusion of the photogenerated carriers, determined by the experimental conditions, which influence the capture probability and hence also the charge state of the quantum dots. This is proposed as a new tool to populate quantum dots with extra electrons in order to study phenomena involving charged excitons.

Tunnelling of Direct and Indirect Excitons in Slightly Asymmetric Double Quantum Wells

84%

Mazurenko D., Akimov A., Moskalenko E., Zhmodikov A., Kaplyanskii A., Challis L., Cheng T., Foxon C.

Acta Physica Polonica A

1996

vol. 90

issue 5

895-898

We report the first studies of luminescence spectra from asymmetric double quantum wells of GaAs with widths around 100 Å differing by only one (2.8 Å) or two monolayers. Studies of the position and intensity of the direct and indirect exciton lines suggest the existence of acoustic phonon-assisted tunnelling between exciton states separated by a few meV. At temperatures 10-20 K the electron tunnelling process is fast enough to maintain thermal equilibrium between these direct and indirect excitons which are connected with holes in the same quantum well.

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2 Acta Physica Polonica A

1 2001

1 1996

2 Moskalenko E.

1 Akimov A.

1 Challis L.

1 Cheng T.

1 Foxon C.

1 Garcia J.

1 Holtz P.

1 Kaplyanskii A.

1 Karlsson K.

1 Mazurenko D.

1 Monemar B.

1 Petroff P.

1 Schoenfeld W.

1 Zhmodikov A.

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Carrier Diffusion in the Barrier Enabling Formation of Charged Excitons in InAs/GaAs Quantum Dots

Tunnelling of Direct and Indirect Excitons in Slightly Asymmetric Double Quantum Wells