Abstract
The 2D electron system in GaAs quantum wells was investigated using optical absorption and photoluminescence measurements in the bandgap region, for magnetic fields B≦30 T and temperatures T≧0.4 K. Several optical anomalies appear as spectral blue-shifts for both increasing field and decreasing temperature, and are related to electron-electron interactions. The anomalies observed at the 2D Landau filling factors ν⋍1 and ν<2/3 have very different field and temperature dependencies. The one near ν=1 is associated with changes in population of the lowest spin-split Landau level. The ones at higher fields are observed only for T<3 K, concurrent with the fractional quantum Hall effect.
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Heiman, D. et al. (1989). Spectral Blue-Shifts in Optical Absorption and Emission of the 2D Electron System in the Magnetic Quantum Limit. In: Landwehr, G. (eds) High Magnetic Fields in Semiconductor Physics II. Springer Series in Solid-State Sciences, vol 87. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-83810-1_42
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DOI: https://doi.org/10.1007/978-3-642-83810-1_42
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