Zeeman splitting andgfactor of heavy-hole excitons inInxGa1−xAs/GaAs quantum wells
| Autor: | N. J. Traynor, R. J. Warburton, Richard T. Harley |
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| Rok vydání: | 1995 |
| Předmět: | |
| Zdroj: | Physical Review B. 51:7361-7364 |
| ISSN: | 1095-3795 0163-1829 |
| DOI: | 10.1103/physrevb.51.7361 |
| Popis: | Zeeman splittings have been investigated for n=1 heavy-hole excitons ${\mathrm{In}}_{\mathit{x}}$${\mathrm{Ga}}_{1\mathrm{\ensuremath{-}}\mathit{x}}$As/GaAs strained-layer quantum wells at 1.8 K and at magnetic fields up to 6 T applied parallel to the growth axis (001). The sign and magnitude of the splitting to precision of \ifmmode\pm\else\textpm\fi{}2 \ensuremath{\mu}eV were obtained from the shift in the exciton photoluminescence line upon switching between right and left circularly polarized detection. Measurements have been made for well widths between 3 and 12 nm and for x values of 0.075 and 0.11. Linear field dependence is observed below 1.5 T giving exciton g factors. For higher fields in narrow wells the dependence becomes nonlinear. We have calculated the g factor using an eight-band k\ensuremath{\cdot}p model and obtain satisfactory agreement with experiment by using the Luttinger parameter \ensuremath{\kappa} for ${\mathrm{In}}_{\mathit{x}}$${\mathrm{Ga}}_{1\mathrm{\ensuremath{-}}\mathit{x}}$As as a variable parameter. From this we obtain an empirical concentration dependence \ensuremath{\kappa}\ensuremath{\approxeq}7.68x+1.1(1-x)-4.0x(1-x). |
| Databáze: | OpenAIRE |
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