Electromechanical Properties of Graphene Drumheads
Electromechanical Properties of Graphene Drumheads
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DOI：
10.1126/science.1220335
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发表时间：
2012-06-22
期刊：
影响因子：
56.9
通讯作者：
Stroscio, Joseph A.
中科院分区：
文献类型：
--
作者：
Klimov, Nikolai N.;Jung, Suyong;Stroscio, Joseph A.
我们通过扫描隧道显微镜(STM)和扫描隧道谱(STS)测量，以及对石墨烯-膜力学和形貌的计算模拟，确定了悬浮石墨烯层的机电性质。通过控制与STM探针尖端的竞争相互作用和背栅电极的电场，实现了石墨烯薄膜的连续变形。探针尖端引起的形变在石墨烯晶格中产生了局域应变场。对变形的悬浮石墨烯的STS测量显示了与衬底支撑的石墨烯完全不同的电子光谱。光谱表明形成了一个空间受限的量子点，这与最近关于应变感应假磁场限制的预测是一致的。
We determined the electromechanical properties of a suspended graphene layer by scanning tunneling microscopy (STM) and scanning tunneling spectroscopy (STS) measurements, as well as computational simulations of the graphene-membrane mechanics and morphology. A graphene membrane was continuously deformed by controlling the competing interactions with a STM probe tip and the electric field from a back-gate electrode. The probe tip-induced deformation created a localized strain field in the graphene lattice. STS measurements on the deformed suspended graphene display an electronic spectrum completely different from that of graphene supported by a substrate. The spectrum indicates the formation of a spatially confined quantum dot, in agreement with recent predictions of confinement by strain-induced pseudomagnetic fields.