Charge detection in graphene quantum dots

被引：107

作者：

Guettinger, J. ^{[1
]}

Stampfer, C. ^{[1
]}

Hellmueller, S. ^{[1
]}

Molitor, F. ^{[1
]}

Ihn, T. ^{[1
]}

Ensslin, K. ^{[1
]}

机构：

[1] ETH, Solid State Phys Lab, CH-8093 Zurich, Switzerland

来源：

APPLIED PHYSICS LETTERS | 2008年 / 93卷 / 21期

基金：

瑞士国家科学基金会;

关键词：

carbon; interface states; nanostructured materials; quantum dots;

D O I：

10.1063/1.3036419

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

We report measurements on a graphene quantum dot with an integrated graphene charge detector. The quantum dot device consists of a graphene island (diameter of similar to 200 nm) connected to source and drain contacts via two narrow graphene constrictions. From Coulomb diamond measurements a charging energy of 4.3 meV is extracted. The charge detector is based on a 45 nm wide graphene nanoribbon placed approximately 60 nm from the island. We show that resonances in the nanoribbon can be used to detect individual charging events on the quantum dot. The charging induced potential change on the quantum dot causes a steplike change in the current in the charge detector. The relative change in the current ranges from 10% up to 60% for detecting individual charging events.

引用

页数：3

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