Observation of excited states in a graphene quantum dot

被引：144

作者：

Schnez, S. ^{[1
]}

Molitor, F. ^{[1
]}

Stampfer, C. ^{[1
]}

Guettinger, J. ^{[1
]}

Shorubalko, I. ^{[1
]}

Ihn, T. ^{[1
]}

Ensslin, K. ^{[1
]}

机构：

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

来源：

APPLIED PHYSICS LETTERS | 2009年 / 94卷 / 01期

基金：

瑞士国家科学基金会;

关键词：

excited states; Landau levels; quantum dots; tunnelling; KLEIN PARADOX; SPIN; TRANSPORT; PHASE;

D O I：

10.1063/1.3064128

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

We demonstrate that excited states in single-layer graphene quantum dots can be detected via direct transport experiments. Coulomb diamond measurements show distinct features of sequential tunneling through an excited state. Moreover, the onset of inelastic cotunneling in the diamond region could be detected. For low magnetic fields, the positions of the single-particle energy levels fluctuate on the scale of a flux quantum penetrating the dot area. For higher magnetic fields, the transition to the formation of Landau levels is observed. Estimates based on the linear energy-momentum relation of graphene give carrier numbers of the order of 10 for our device.

引用

页数：3

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