期刊
NANO LETTERS
卷 20, 期 5, 页码 3113-3121出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.nanolett.9b05108
关键词
graphene; inhomogeneous strain; superlattice; STM; extreme strain
类别
资金
- National Science Foundation [1229138]
- Air Force Office of Scientific Research (AFOSR) [17RT0244]
- Francqui Foundation
- F.R.S.-FNRS of Belgium [T.1077.15]
- lag-Era JTC 2017 project MECHANIC [R.50.07.18.F]
- Federation Wallonie-Bruxelles through the ARC on 3D nanoarchitecturing of 2D crystals [16/21-077]
- European Union's Horizon 2020 research and innovation program [696656]
- Division Of Materials Research
- Direct For Mathematical & Physical Scien [1229138] Funding Source: National Science Foundation
Numerous theoretically proposed devices and novel phenomena have sought to take advantage of the intense pseudogauge fields that can arise in strained graphene. Many of these proposals, however, require fields to oscillate with a spatial frequency smaller than the magnetic length, while to date only the generation and effects of fields varying at a much larger length scale have been reported. Here, we describe the creation of short wavelength, periodic pseudogauge-fields using rippled graphene under extreme (>10%) strain and study of its effects on Dirac electrons. Combining scanning tunneling microscopy and atomistic calculations, we find that spatially oscillating strain generates a new quantization different from the familiar Landau quantization. Graphene ripples also cause large variations in carbon-carbon bond length, creating an effective electronic superlattice within a single graphene sheet. Our results thus also establish a novel approach of synthesizing effective 2D lateral heterostructures by periodically modulating lattice strain.
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