Physics
Scientific paper
May 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007natph...3..315s&link_type=abstract
Nature Physics, Volume 3, Issue 5, pp. 315-318 (2007).
Physics
17
Scientific paper
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 (~80nm) 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 100mK. 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.
Farrer Ian
Ghosh Arindam
Pepper Michael
Ritchie David A.
Siegert Christoph
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