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Tunneling Control of Optical Properties of a Quantum Well from Adjacent Quantum Well by Coherent Population Trapping Effect

100%
Barantsev K., Litvinov A., Velichko E.
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vol. 126
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issue 5
1069-1071
EN
The coherent population trapping effect in double tunnel-coupled quantum wells is analyzed. One of two quantum wells interacts with the two-frequency laser radiation and low-frequency field, thus forming a closed contour of excitation. It is possible to control the excited level population in such a scheme of excitation by changing relative phases of the fields in the coherent population trapping state. The quantum well is bound to the other quantum well by tunnel coupling of the excited levels, therefore the population and optical properties of the other quantum well depend on the coherent population trapping state in the first quantum well and can be controlled.
2
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Motional Enhancement of Exciton Magnetic Moments

64%
Litvinov A., Kochereshko V., Cox R., Besombes L., Mariette H., Boukari H., Loginov D., Davies J., Smith L., Wolverson D.
Acta Physica Polonica A
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2007
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vol. 112
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issue 2
161-165
EN
The phenomenon in which giant enhancement of exciton magnetic moments occurs due to translational motion was found for light hole excitons in ZnTe/ZnMgTe quantum well structures. Decreasing diamagnetic shifts as the number of the exciton quantized state increases were found for the first time.
3
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Excitonic Polaritons in Transverse Magnetic Fields

64%
Loginov D., Kochereshko V., Litvinov A., Besombes L., Mariette H., Davies J., Smith L., Wolverson D.
Acta Physica Polonica A
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2007
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vol. 112
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issue 2
381-386
EN
Reflectivity spectra taken from wide quantum wells based on CdTe/CdZnTe and GaAs/AlGaAs (in which the well width is much larger than the exciton Bohr radius) were studied in magnetic fields in the plane of the well (the Voigt geometry). The energy splitting between bright and dark excitons and the redistribution of the oscillator strength from bright to dark was observed and this allowed us to determine the exciton exchange constantΔ. We found that exciton translational mass depends on the value of magnetic field. Additionally, we found that diamagnetic shift also depends on exciton wave vector. Changes in the spectra in the range of the overlap of heavy and light hole exciton resonances were observed when the magnetic field was inverted. Theoretical modeling of the spectra allowed us to explain all the observed features in the reflectivity spectra and to determine some material parameters.
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