Back to Search
Start Over
The possibility of an intrinsic spin lattice in high-mobility semiconductor heterostructures.
- Source :
-
Nature Physics . May2007, Vol. 3 Issue 5, p315-318. 4p. 4 Diagrams, 6 Graphs. - Publication Year :
- 2007
-
Abstract
- Embedding magnetic moments into semiconductor heterostructures offers a tuneable access to various forms of magnetic ordering and phase transitions in low-dimensional electron systems. In general, the moments are introduced artificially, by either doping with ferromagnetic atoms, or electrostatically confining odd-electron quantum dots. Here, we report experimental evidence of an independent, and intrinsic, source of localized spins in high-mobility GaAs/AlGaAs heterostructures with large setback distance (≈80 nm) in modulation doping. Measurements reveal a quasi-regular distribution of the spins in the delocalized Fermi sea, and a mutual interaction via the Ruderman–Kittel–Kasuya–Yosida (RKKY) indirect exchange below 100 mK. We show that a simple model on the basis of the fluctuations in background potential on the host two-dimensional electron system can explain the observed results quantitatively, which suggests a ‘disorder-templated’ microscopic origin of the localized moments. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 17452473
- Volume :
- 3
- Issue :
- 5
- Database :
- Academic Search Index
- Journal :
- Nature Physics
- Publication Type :
- Academic Journal
- Accession number :
- 24944237
- Full Text :
- https://doi.org/10.1038/nphys559