Session Q22: Graphene Junctions

11:15 AM–2:03 PM, Wednesday, March 17, 2010
Room: Portland Ballroom 252

Sponsoring Units: DCMP DMP
Chair: Pablo Jarillo-Herrero, Massachusetts Institute of Technology

Abstract ID: BAPS.2010.MAR.Q22.9

Abstract: Q22.00009 : Manipulation of Electron Beam Propagation by Hetero-Dimensional Graphene Junctions

12:51 PM–1:03 PM

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  Zhengfei Wang
    (Department of Materials Science and Engineering, University of Utah)

  Feng Liu
    (Department of Materials Science and Engineering, University of Utah)

Manipulation of electron beam propagation in low-dimensional nanostructures is the fundamental process required for quantum information processing and quantum computation in the future. Recently, graphene has been proposed as a candidate system for splitting and focusing electron beam by applying an external field or potential. Here, we demonstrate theoretically a new mechanism for the energy-selective manipulation of electron beam by nanostructured hetero-dimensional graphene junctions (HDGJs) without external field. Electron beam splitting, collimation, and beam-guide can all be realized by designing HDGJs of different dimensionality, size and orientation. Importantly, these different functions can be combined together by pre-designed patterning of multiple HDGJ units in one graphene sheet, making it feasible for large-scale integration of graphene-based quantum devices. Furthermore, we show an effective method for mapping the electron beam propagation in graphene by scanning probe microscopy (SPM), as being done in two-dimensional electron gas (2DEG), which will be very useful for fundamental study of electron transport and quantum phenomena in graphene.

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