Journal
SCIENCE
Volume 336, Issue 6088, Pages 1557-1561Publisher
AMER ASSOC ADVANCEMENT SCIENCE
DOI: 10.1126/science.1220335
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Funding
- U.S. National Science Foundation [CMMI-1069076, CMMI-1129826, CMMI-0841840]
- Div Of Civil, Mechanical, & Manufact Inn
- Directorate For Engineering [1129826, 1069076] Funding Source: National Science Foundation
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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.
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