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arXiv 0901.2433cond-mat.mes-hallcond-mat.mtrl-sci
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自旋自由核Si/SiGe异质结中的肖特基顶栅二维电子系统

A Schottky top-gated two-dimensional electron system in a nuclear spin free Si/SiGe heterostructure

J. Sailer, V. Lang, G. Abstreiter, G. Tsuchiya, K. M. Itoh, J. W. Ager, E. E. Haller, D. Kupidura, D. Harbusch, S. Ludwig, D. Bougeard

摘要:

本文报道了在分子束外延中,利用28 Si和70 Ge源材料,在无核自旋环境中实现二维电子系统的顶选通。在核自旋自由材料中,电子自旋退相干被期望最小化,使它们成为基于固态的量子信息处理设备的有希望的宿主。二维电子系统表现出的迁移率为18000 cm 2/Vs在4.6E11 cm-2的片载流子密度在低温下。通过钯肖特基顶栅实现的分裂栅结构,有效地控制下面的二维电子系统的运输证明了可靠的门控的可行性。我们的工作为在核自旋自由环境中实现静电定义的量子点奠定了基础。

英文摘要:

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.

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