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Publication Citation: Making Mn Substitutional Impurities in InAs using a Scanning Tunneling Microscope

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Author(s): Young J. Song; Steven C. Erwin; Gregory M. Rutter; Phillip N. First; Nikolai B. Zhitenev; Joseph A. Stroscio;
Title: Making Mn Substitutional Impurities in InAs using a Scanning Tunneling Microscope
Published: September 29, 2009
Abstract: We describe in detail a new atom-by-atom exchange manipulation technique using a scanning tunneling microscope probe. As-deposited Mn adatoms (Mnad) are exchanged one-by-one with surface In atoms (Insu) to create a Mn surface-substitutional (MnIn) and an exchanged In adatom (Inad) by an electron tunneling induced reaction Mnad + Insu→MnIn + Inad on the InAs(110) surface. The Mn and In atom exchange process occurs when a negative applied tunneling potential to the InAs substrate exceeds a threshold of approximately -0.6 V. In combination with density-functional theory (DFT) and high resolution STM imaging, we have identified the reaction pathway for the Mn and In atom exchange. As the two atoms are exchanged, an energy barrier of 0.3 eV is found from DFT calculations in qualitative agreement with the experimentally observed voltage thresholds.
Citation: Nano Letters
Volume: 9
Issue: 12
Pages: pp. 4333 - 4337
Keywords: STM;InAs;atom manipulation
Research Areas: Nanotechnology, Nanophysics
PDF version: PDF Document Click here to retrieve PDF version of paper (398KB)