Scanning Tunneling MicrosopyBasics
Transmission coefficientcritically dependent on the
distance btw. tip & surf.
Electron energy level densities
Electron flow
A bias voltage needs to be applied:
DVbias is necessary to raise the Fermi level and create free levelsfor the electrons. Tunneling probability depends on the existence (and density) of free levels.
DVbias is positive or negative with reference to the tip’s Fermi level.
Basics of tunneling
Atomic Force Microsopy-