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Spin susceptibility and effective mass of a 2D electron system in GaAs heterostructures towards the weak interacting regime
- Source :
- Physica E: Low-dimensional Systems and Nanostructures. 34:260-263
- Publication Year :
- 2006
- Publisher :
- Elsevier BV, 2006.
-
Abstract
- We determined the spin susceptibility Χ and the effective mass m* towards the high density limit. Using a tunable GaAs/AlGaAs heterostructure, we can vary the 2D electron density from n = 1 x 10 10 cm -2 to 4 x 10" cm -2 . From ∼5 x 10 10 cm -2 to our highest densities the mass values fall ∼10% below the band mass of GaAs. The enhancement of Χ decreases monotonically from a factor of 3 to 0.88 with increasing density. It continues to follow a previously observed power law, which leads to an unphysical limit for n → oo. Band structure effects affecting mass and g-factor become appreciable for large n and, when taken into account, lead to the correct limiting behavior of Χ. Numerical calculations are in qualitative agreement with our data but differ in detail.
Details
- ISSN :
- 13869477
- Volume :
- 34
- Database :
- OpenAIRE
- Journal :
- Physica E: Low-dimensional Systems and Nanostructures
- Accession number :
- edsair.doi...........0afd40f05eb73b19f2e6350c01a1e65e