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Optical Detection of Cyclotron Resonance in Serpentine Superlattice Quantum-Wire Arrays

100%

Świątek K., Weman H., Miller M., Petroff P., Merz J.

Acta Physica Polonica A

1993

vol. 84

issue 3

583-586

We report low-temperature studies of microwave-induced cyclotron resonance of photo-generated carriers in (Al,Ga)As serpentine superlattice quantum-wire arrays. The geometric size of the parabolic-crescent cross-section of the quantum wires was of the order of 100 Å × 50 Å, depending on the angle of the vicinal substrate and the amount of parabolic curvature. Comparing the obtained spectra, we estimate the relative degree of carrier confinement in the ordered AlGaAs structure.

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

86%

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.

Spin-Dependent Coupling of Charged Quantum Dot Excitons with Continuum States

59%

Urbaszek B., Warburton R., Karrai K., Schulhauser C., Högele A., McGhee E., Govorov A., Gerardot B., Marie X., Amand T., Petroff P.

Acta Physica Polonica A

2004

vol. 106

issue 3

395-402

Magnetic field and temperature dependent photoluminescence studies on neutral and charged excitons in individual InAs quantum dots allow us to uncover different mechanisms by which the discrete quantum dot states are coupled to delocalized continuum states in a quantum well (the wetting layer). The behaviour of the neutral and singly charged excitons can be explained taking only discrete quantum dot states into account. For doubly and triply charged excitons we have to consider spin dependent coherent and incoherent interactions between discrete quantum dot states and delocalized wetting layer states.

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3 Acta Physica Polonica A

1 2004

1 2001

1 1993

3 Petroff P.

1 Amand T.

1 Garcia J.

1 Gerardot B.

1 Govorov A.

1 Holtz P.

1 Högele A.

1 Karlsson K.

1 Karrai K.

1 Marie X.

1 McGhee E.

1 Merz J.

1 Miller M.

1 Monemar B.

1 Moskalenko E.

1 Schoenfeld W.

1 Schulhauser C.

1 Urbaszek B.

1 Warburton R.

1 Weman H.

1 Świątek K.

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Optical Detection of Cyclotron Resonance in Serpentine Superlattice Quantum-Wire Arrays

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

Spin-Dependent Coupling of Charged Quantum Dot Excitons with Continuum States