Siegert, C. ; Ghosh, A. ; Pepper, M. ; Farrer, I. ; Ritchie, D.A. ; Anderson, D. ; Jones, G.A.C. (2008) Field-tunable magnetic phases in a semiconductor-based two-dimensional Kondo lattice Physica E: Low-dimensional Systems and Nanostructures, 40 (5). pp. 942-948. ISSN 1386-9477
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Official URL: http://www.sciencedirect.com/science/article/pii/S...
Related URL: http://dx.doi.org/10.1016/j.physe.2007.09.138
Abstract
We show the existence of intrinsic localized spins in mesoscopic high-mobility GaAs/AlGaAs heterostructures. Non-equilibrium transport spectroscopy reveals a quasi-regular distribution of the spins and indicates that the spins interact indirectly via the conduction electrons. The interaction between spins manifests itself in a characteristic zero-bias anomaly near the Fermi energy, and indicates gate voltage-controllable magnetic phases in high-mobility heterostructures. To address this issue further, we have also designed electrostatically tunable Hall devices that allow a probing of Hall characteristics at the active region of the mesoscopic devices. We show that the zero field Hall coefficient has an anomalous contribution, which can be attributed to scattering by the localized spins. The anomalous contribution can be destroyed by an increase in temperature, source-drain bias or field range.
Item Type: | Article |
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Source: | Copyright of this article belongs to Elsevier Science. |
Keywords: | Intrinsic Spin Lattice; 2DEG; Spin Interaction; Anomalous Hall Effect; RKKY |
ID Code: | 101564 |
Deposited On: | 01 Feb 2018 10:08 |
Last Modified: | 01 Feb 2018 10:08 |
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