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STM scanner tunneling Current

  1. Nov 10, 2011 #1
    1. The problem statement, all variables and given/known data
    Suppose that an STM scans a surface at a distance of a=1.000nm. Take the height of the potential barrier to be U°-E=2.00 eV. If the STM tip movies away from the surface by 2.00%, estimate the percentage change in the tunneling current.

    2. Relevant equations

    3. The attempt at a solution
    I honestly dont know how to do this. Ive been reading over our chapter on tunnelling and there doesnt seem to be anything related to this problem.
  2. jcsd
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