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arXiv 1011.2091cond-mat.mes-hall
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不同长径比石墨烯收缩中的无序诱导库仑能隙

Disorder induced Coulomb gaps in graphene constrictions with different aspect ratios

B. Terrés, J. Dauber, C. Volk, S. Trellenkamp, U. Wichmann, C. Stampfer

摘要:

我们目前的电子输运测量光刻定义和蚀刻的石墨烯纳米收缩具有不同的纵横比,包括不同的长度(L)和宽度(W)。在电荷中性点附近可以观察到一个与长度无关的无序诱导的有效能隙。该能隙与宽度成反比,即使在收缩部的长度小于其宽度(L<W)的情况下也是如此。在很短的收缩,我们观察到由于本地化的状态或带电的岛屿和一个整体电导水平(0.1- 1 E2/h),这是强烈的长度依赖于间隙区域的共振。这使得非常短的石墨烯收缩对于高度透明的石墨烯隧穿势垒是有趣的。

英文摘要:

We present electron transport measurements on lithographically defined and etched graphene nanoconstrictions with different aspect ratios including different lengths (L) and widths (W). A roughly length-independent disorder induced effective energy gap can be observed around the charge neutrality point. This energy gap scales inversely with the width even in regimes where the length of the constriction is smaller than its width (L<W). In very short constrictions, we observe both resonances due to localized states or charged islands and an elevated overall conductance level (0.1-1e2/h), which is strongly length-dependent in the gap region. This makes very short graphene constrictions interesting for highly transparent graphene tunneling barriers.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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