Scanning tunneling microscope and electron beam induced luminescence in quantum wires

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  • L. Samuelson
    Department of Solid State Physics, Lund University, Box 118, S-221 00 LUND, Sweden
  • A. Gustafsson
    Department of Solid State Physics, Lund University, Box 118, S-221 00 LUND, Sweden
  • J. Lindahl
    Department of Solid State Physics, Lund University, Box 118, S-221 00 LUND, Sweden
  • L. Montelius
    Department of Solid State Physics, Lund University, Box 118, S-221 00 LUND, Sweden
  • M.-E. Pistol
    Department of Solid State Physics, Lund University, Box 118, S-221 00 LUND, Sweden
  • J.-O. Malm
    National Center for HREM, Department of Inorganic Chemistry 2, Lund University, Box 124, S-221 00 LUND, Sweden
  • G. Vermeire
    University of Gent-IMEC, Department of Information Technology, St-Pietersnieuwstraat 41, B-9000 Gent, Belgium
  • P. Demeester
    University of Gent-IMEC, Department of Information Technology, St-Pietersnieuwstraat 41, B-9000 Gent, Belgium

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<jats:p>Quantum wire structures of GaAs/AlGaAs have been grown by metalorganic vapor phase epitaxy in V grooves using pre-etched corrugated substrates and have been characterized by high-resolution transmission electron microscopy. Low-temperature cathodoluminescence (CL) identifies luminescence peaks with the spatial distributions of the different recombinations, achieving a top view spatial resolution of ≊0.2 μm in the CL images. Principally we report how a scanning tunneling microscope (STM) induces local luminescence in the sample structure, and we spectrally resolve STM-induced luminescence for the tip in different positions relative to the wires. We have recorded the luminescence from a single wire and observed band-filling effects resulting from varying levels of excitation into a wire. We have demonstrated the difference between recombination of electron-hole pairs generated in CL and the recombination of injected holes from the STM tip with a thermalized distribution of accumulated electrons in scanning tunneling luminescence.  </jats:p>

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