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01735 am a22001933u 4500 |
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78552 |
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|a Snelling, M.J.
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|a Flinn, G.P.
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|a Plaut, A.S.
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|a Harley, R.T.
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|a Tropper, A.C.
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|a Eccleston, R.
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|a Phillips, C.C.
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|a Magnetic g-factor of electrons in GaAs/AlGaAs quantum wells
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|c 1991.
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|u https://eprints.soton.ac.uk/78552/1/252P.pdf
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|a The magnitude and sign of the effective magnetic splitting factor g* for conduction electrons in GaAs/AlxGa(1-x)As quantum wells have been determined as a function of well width down to 5 nm. The experimental method is based on combined measurements of the decay time of photoluminescence and of the suppression of its circular polarization under polarized optical pumping in a magnetic field perpendicular to the growth axis (Hanle effect). Measurements as a function of hole sheet density in the wells reveal a transition from excitonic behavior with very small apparent g value for low density, to larger absolute values characteristic of free electrons at higher densities. For 20-nm wells g* for electrons is close to the bulk value (-0.44), and increases for narrower wells passing through zero for well width close to 5.5 nm. A theoretical analysis based on three-band k.p theory, including allowance for conduction-band nonparabolicity and for wave-function penetration into the barriers, gives a reasonable representation of the data, leading to the conclusion that g* in quantum wells has a value close to that of electrons in the bulk at the confinement energy above the band minimum.
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