The possibility of an intrinsic spin lattice in high-mobility semiconductor heterostructures

Siegert, Christoph ; Ghosh, Arindam ; Pepper, Michael ; Farrer, Ian ; Ritchie, David A. (2007) The possibility of an intrinsic spin lattice in high-mobility semiconductor heterostructures Nature Physics, 3 (5). pp. 315-318. ISSN 1745-2473

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Official URL: http://www.nature.com/nphys/journal/v3/n5/full/nph...

Related URL: http://dx.doi.org/10.1038/nphys559

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 dots1,2,3,4. 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.

Item Type:Article
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ID Code:101566
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