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    Understanding magnetic focusing in graphene p-n junctions through quantum modeling

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    Understanding magnetic focusing in graphene p-n junctions through quantum modeling_Final.pdf (4.096Mb)
    Date
    2017-04-21
    Author
    LaGasse, Samuel W.
    Lee, Ji Ung
    Publisher
    Physical Review B
    Metadata
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    Subject
    transverse magnetic focusing (TMF)
    graphene
    p-n junction
    quantum transport method
    quantum modeling
    Abstract
    We present a quantum model which provides enhanced understanding of recent transverse magnetic focusing experiments on graphene p-n junctions. Spatially resolved flow maps of local particle current density show quantum interference and p-n junction filtering effects, which are crucial to explaining the device operation. The Landauer-Büttiker formula is used alongside dephasing edge contacts to give exceptional agreement between simulated nonlocal resistance and the recent experiment by Chen et al. [Science 353, 1522 (2016)]. The origin of positive and negative focusing resonances and off-resonance characteristics are explained in terms of quantum transmission functions. Our model also captures subtle features from experiment, such as the p-p− to p-p+ transition and the second p-n focusing resonance.
    URI
    http://hdl.handle.net/1951/69264
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    • SUNY Polytechnic Institute Faculty and Staff Research, Publications, and Creative Works [63]

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