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4 Acta Physica Polonica A

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Calculation of Exciton and Trion Absorption Spectra in High Magnetic Fields

100%

Gładysiewicz A. , Wójs A.

Acta Physica Polonica A

2006

tom 110

nr 2

183-188

Density of states and absorption spectrum of narrow quantum wells containing a small number of free electrons and subject to a high magnetic field are calculated numerically. The effect of an additional, second electron on the photoexcited electron-hole pair is analyzed. In density of states, the exciton-electron interaction fills the gaps between the Landau levels and yields additional discrete peaks corresponding to bound trions. In absorption, interaction with the additional free electron has no effect on the position or intensity of the main sequence of excitonic peaks. However, it gives rise to additional weaker trion peaks, both in the lowest and higher Landau levels.

Fractional Quasiexcitons in Photoluminescence of Quantum Hall Liquids

80%

Wójs A. , Gładysiewicz A. , Quinn J.

Acta Physica Polonica A

2005

tom 108

nr 5

923-928

Realistic calculations of photoluminescence spectra for a 20 nm quantum well at a filling factorν=1/3 are presented. The new states formed from charged excitons (trions) by correlation with the surrounding electrons are identified. These "quasiexcitons" differ from usual excitons and trions by having fractionally charged constituents. Their binding energies and emission intensities depend on the involved trion, leading to discontinuity in photoluminescence.

Trion Binding Energies and Wave Functions in Doped Quantum Wells

80%

Gładysiewicz A. , Wójcik K. , Wójs A. , Quinn J.

Acta Physica Polonica A

2005

tom 108

nr 4

669-674

The energy spectra of negative trions (X^-=2e+h) in one-sided doped GaAs quantum wells are calculated. The maps of the trion binding energyΔ as a function of well width w, electron concentration n, and the magnetic field B are obtained. The dependence of the trion ground state ("bright singlet" versus "dark triplet") on those parameters is established.

Experimental and Theoretical Studies of Free and Acceptor-Bound Positive Magneto-Trions

61%

Bryja L. , Wójs A. , Płochocka-Polack P. , Gładysiewicz A. , Misiewicz J. , Potemski M.

Acta Physica Polonica A

2007

tom 112

nr 2

415-418

By combination of polarization-resolved photoluminescence, transport, and realistic numerics we study energy and recombination spectra of free and acceptor-bound positive trions in a quasi-two-dimensional hole gas. The singlet-triplet crossing in the trion ground state is found at B≈12 T, and a slight reduction of all trion binding energies coincident with the formation of a Laughlin hole fluid is observed at B≈14.2 T.