Electrically tunable transverse magnetic focusing in graphene
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Jarillo-Herrero_Electrically tunable.pdf
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Author(s)
Taychatanapat, Thiti
Watanabe, Kenji
Taniguchi, Takashi
Jarillo-Herrero, Pablo
Date Issued
February 2013
Journal
Nature Physics
Publisher
Nature Publishing Group
Citation
Taychatanapat, Thiti, Kenji Watanabe, Takashi Taniguchi, and Pablo Jarillo-Herrero. “Electrically tunable transverse magnetic focusing in graphene.” Nature Physics 9, no. 4 (February 17, 2013): 225-229.
Version
Author's final manuscript
Abstract
Electrons in a periodic lattice can propagate without scattering for macroscopic distances despite the presence of the non-uniform Coulomb potential due to the nuclei. Such ballistic motion of electrons allows the use of a transverse magnetic field to focus electrons. This phenomenon, known as transverse magnetic focusing (TMF), has been used to study the Fermi surface of metals and semiconductor heterostructures, as well as to investigate Andreev reflection and spin–orbit interaction, and to detect composite fermions. Here we report on the experimental observation of TMF in high-mobility mono-, bi- and tri-layer graphene devices. The ability to tune the graphene carrier density enables us to investigate TMF continuously from the hole to the electron regime and analyse the resulting focusing fan. Moreover, by applying a transverse electric field to tri-layer graphene, we use TMF as a ballistic electron spectroscopy method to investigate controlled changes in the electronic structure of a material. Finally, we demonstrate that TMF survives in graphene up to 300 K, by far the highest temperature reported for any system, opening the door to new room-temperature applications based on electron-optics.
Description
Author's final manuscript January 9, 2013
MIT Department
Massachusetts Institute of Technology. Department of Physics
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Article is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use.
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DOI of Published Version
https://doi.org/10.1038/nphys2549
