Creating and probing electron whispering-gallery modes in graphene
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WGM_Zhao_graphene_preprint.pdf
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1.66 MB
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Checksum (MD5)
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Author(s)
Zhao, Y.
Wyrick, J.
Natterer, F. D.
Lewandowski, C.
Watanabe, K.
Taniguchi, T.
Zhitenev, N. B.
Stroscio, J. A.
Rodriguez Nieva, Joaquin Fran
Levitov, Leonid
Date Issued
May 2015
Journal
Science
Publisher
American Association for the Advancement of Science (AAAS)
Citation
Zhao, Y., J. Wyrick, F. D. Natterer, J. F. Rodriguez-Nieva, C. Lewandowski, K. Watanabe, T. Taniguchi, L. S. Levitov, N. B. Zhitenev, and J. A. Stroscio. “Creating and Probing Electron Whispering-Gallery Modes in Graphene.” Science 348, no. 6235 (May 7, 2015): 672–675.
Version
Author's final manuscript
Abstract
The design of high-finesse resonant cavities for electronic waves faces challenges due to short electron coherence lengths in solids. Complementing previous approaches to confine electronic waves by carefully positioned adatoms at clean metallic surfaces, we demonstrate an approach inspired by the peculiar acoustic phenomena in whispering galleries. Taking advantage of graphene’s gate-tunable light-like carriers, we create whispering-gallery mode (WGM) resonators defined by circular pn junctions, induced by a scanning tunneling probe. We can tune the resonator size and the carrier concentration under the probe in a back-gated graphene device over a wide range. The WGM-type confinement and associated resonances are a new addition to the quantum electron-optics toolbox, paving the way to develop electronic lenses and resonators.
MIT Department
Massachusetts Institute of Technology. Department of Physics
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Creative Commons Attribution-Noncommercial-Share Alike
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DOI of Published Version
https://doi.org/10.1126/science.aaa7469
