Direct measurement of the spin gaps in a gated GaAs two-dimensional electron gas.
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Abstract
We have performed magnetotransport measurements on gated GaAs two-dimensional electron gases in which electrons are confined in a layer of the nanoscale. From the slopes of a pair of spin-split Landau levels (LLs) in the energy-magnetic field plane, we can perform direct measurements of the spin gap for different LLs. The measured g-factor g is greatly enhanced over its bulk value in GaAs (0.44) due to electron-electron (e-e) interactions. Our results suggest that both the spin gap and g determined from conventional activation energy studies can be very different from those obtained by direct measurements.
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Keywords
Spin, g-factor, Disorder
Journal Title
Nanoscale Res Lett
Conference Name
Journal ISSN
1931-7573
1556-276X
1556-276X
Volume Title
Publisher
Springer Science and Business Media LLC