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SM ISO690:2012 HAKIOGLU, Tugrul, LIBERMAN, Michael, MOSKALENKO, Sveatoslav, PODLESNY, Igor. The influence of the Rashba spinorbit coupling on the two-dimensional magnetoexcitons. In: Journal of Physics Condensed Matter, 2011, vol. 23, pp. 1-14. ISSN 0953-8984. DOI: https://doi.org/10.1088/0953-8984/23/34/345405 |
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Journal of Physics Condensed Matter | |||||||
Volumul 23 / 2011 / ISSN 0953-8984 /ISSNe 1361-648X | |||||||
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DOI:https://doi.org/10.1088/0953-8984/23/34/345405 | |||||||
Pag. 1-14 | |||||||
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The influence of the Rashba spinorbit coupling(RSOC) on the two-dimensional (2D) electrons and holes in a strong perpendicular magnetic field leads to different results for the Landau quantization in different spin projections. In the Landau gauge the unidimensional wave vector describing the free motion in one in-plane direction is the same for both spin projections, whereas the numbers of Landau quantization levels are different. For an electron in an s-type conduction band they differ by one, as was established earlier by Rashba(1960 Fiz. Tverd. Tela2 1224), whereas for heavy holes in a p-type valence band influenced by the 2D symmetry of the layer they differ by three. The shifts and the rearrangements of the 2D hole Landau quantization levels on the energy scale are much larger in comparison with the case of conduction electron Landau levels. This is due to the strong influence of the magnetic field on the RSOC parameter. At sufficiently large values of this parameter the shifts and rearrangements are comparable with the hole cyclotron energy. There are two lowest spin-split Landau levels for electrons as well as four lowest ones for holes in the case of small RSOC parameters. They give rise to eight lowest energy bands of the 2D magnetoexcitons, as well as of the band-to-band quantum transitions. It is shown that three of them are dipole-active, three are quadrupole-active and two are forbidden. The optical orientation under the influence of circularly polarized light leads to optical alignment of the magnetoexcitons with different orbital momentum projections in the direction of the external magnetic field |
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Cuvinte-cheie Engineering controlled terms Electron mobility, Magnetic fields, Two dimensional Engineering uncontrolled terms Circularly polarized light, Conduction Electrons, Cyclotron energy, Electrons and holes, Energy scale, external magnetic field, Free motion, Heavy holes, In-plane direction, Landau gauge, Landau levels, Landau quantization, magnetoexcitons, Optical alignments, Optical orientation, Orbital momentum, p-Type, Perpendicular magnetic fields, quantum transitions, Rashba spin-orbit coupling, Spin projections, Wave vector Engineering main heading Electrons |
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