Imaging of Few-electron InAs Quantum Dots in InAs/InP Nanowires

ORAL

Abstract

InAs quantum dots are promising contenders for nanoelectronics, spintronics and quantum information processing.~ Their large g-factor makes manipulation of electron spins easier at higher temperatures.~ InAs dots, as small as 10 nm long holding only a few electrons, can be formed by InP barriers in InAs/InP nanowire heterostructures grown using chemical beam epitaxy.~ Coulomb blockade transport measurements done using metal contacts and a back gate show excellent results [1].~ Using a liquid-He cooled scanning probe microscope, we imaged an InAs quantum dot that holds only one-electron, with the conducting tip as a movable gate [2].~ Simulations of electron wavefunctions in the dot show the effect of the back gate and the moveable tip. [1] M. Bj\"{o}rk\textit{ et al.}, Nano Letters\textbf{ 4}, 1621 (2004) [2] A. Bleszynski\textit{ et al.}, 28th Int. Conf. Physics of Semiconductors, 2006

*Supported at Harvard by the ARO (W911NF-04-0343) and our NSEC (NSF PHY-01-17795).

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Authors

  • Erin E. Boyd

    • Dept of Physics, Harvard Univ

  • Halvar J. Trodahl

    • Dept of Physics, Harvard Univ

  • Ania Bleszynski

    • Dept of Physics, Yale Univ
    • Department of Physics, Yale University
    • Department of Physics, Yale University, New Haven, CT

  • Michael Stopa

    • Div of Eng and App Sci, Harvard Univ

  • Robert M. Westervelt

    • Dept of Physics and Div of Engineering \& Applied Sciences, Harvard Univ
    • Dept of Physics and Div of Eng and App Sci, Harvard Univ
    • Harvard University
    • Mallinckrodt Professor of Applied Physics and of Physics
    • Department of Physics, Harvard University, Cambridge, MA
    • Harvard DEAS
    • Department of Physics

  • Linus Fr\"oberg

    • Dept of Solid State Physics, Lund Univ
    • Lund University

  • L. Samuelson

    • Dept of Solid State Physics, Lund Univ
    • Lund University, Solid State Physics / the Nanometer Structure Consortium, Box 118, S-221 00 Lund, Sweden
    • Lund University
    • Solid State Physics, Lund University, Sweden