Physics – Condensed Matter – Mesoscale and Nanoscale Physics
Scientific paper
2009-01-16
Phys. Status Solidi RRL 3, No. 2, 61-63 (2009)
Physics
Condensed Matter
Mesoscale and Nanoscale Physics
8 pages, 3 figures
Scientific paper
10.1002/pssr.200802275
We report on the realization and top-gating of a two-dimensional electron system in a nuclear spin free environment using 28Si and 70Ge source material in molecular beam epitaxy. Electron spin decoherence is expected to be minimized in nuclear spin-free materials, making them promising hosts for solid-state based quantum information processing devices. The two-dimensional electron system exhibits a mobility of 18000 cm2/Vs at a sheet carrier density of 4.6E11 cm-2 at low temperatures. Feasibility of reliable gating is demonstrated by transport through split-gate structures realized with palladium Schottky top-gates which effectively control the two-dimensional electron system underneath. Our work forms the basis for the realization of an electrostatically defined quantum dot in a nuclear spin free environment.
Abstreiter Gerhard
Ager III J. W.
Bougeard Dominique
Haller Elmar
Harbusch D.
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