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← ScienceWhich mechanism causes variations in STM (scanning tunneling microscope) images taken of a graphene flake?
A)Quantum interference altering tunneling probability✓
B)Magnetic field fluctuations affecting electron spin
C)Thermal expansion shifting atomic positions
D)Surface contamination altering electronic density
💡 Explanation
When scanning graphene with an STM, variations in the local electronic structure cause changes in quantum interference patterns because electron tunneling probability is highly sensitive to this interference. Therefore quantum interference occurs during the scan, rather than magnetic, expansions, or contamination variations which would affect local density.
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