Siegert, C., Ghosh, A., Pepper, M. et al. (2 more authors) (2007) Observation of a two-dimensional spin-lattice in non-magnetic semiconductor heterostructures. arXiv.org: Condensed Matter>Mesoscale and Nanoscale Physics. arXiv:cond-mat/0701519. (Unpublished)
Abstract
Tunable magnetic interactions in high-mobility nonmagnetic semiconductor heterostructures are centrally important to spin-based quantum technologies. Conventionally, this requires incorporation of "magnetic impurities" within the two-dimensional (2D) electron layer of the heterostructures, which is achieved either by doping with ferromagnetic atoms, or by electrostatically printing artificial atoms or quantum dots. Here we report experimental evidence of a third, and intrinsic, source of localized spins in high-mobility GaAs/AlGaAs heterostructures, which are clearly observed in the limit of large setback distance (=80 nm) in modulation doping. Local nonequilibrium transport spectroscopy in these systems reveals existence of multiple spins, which are located in a quasi-regular manner in the 2D Fermi sea, and mutually interact at temperatures below 100 milliKelvin via the Ruderman-Kittel-Kasuya-Yosida (RKKY) indirect exchange. The presence of such a spin-array, whose microscopic origin appears to be disorder-bound, simulates a 2D lattice-Kondo system with gate-tunable energy scales.
Metadata
Item Type: | Article |
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Authors/Creators: |
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Copyright, Publisher and Additional Information: | © 2007 The Author(s) |
Keywords: | cond-mat.mes-hall; cond-mat.mes-hall |
Dates: |
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Institution: | The University of Sheffield |
Academic Units: | The University of Sheffield > Faculty of Engineering (Sheffield) > Department of Electronic and Electrical Engineering (Sheffield) |
Depositing User: | Symplectic Sheffield |
Date Deposited: | 28 Oct 2015 15:10 |
Last Modified: | 21 Mar 2018 02:00 |
Published Version: | http://arxiv.org/abs/cond-mat/0701519v1 |
Status: | Unpublished |
Publisher: | Cornell University Library |
Refereed: | No |
Open Archives Initiative ID (OAI ID): | oai:eprints.whiterose.ac.uk:88074 |