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← ScienceWhich consequence results when a scanning tunneling microscope's bias exceeds alumina tunneling barrier potential?
A)Tip-sample junction undergoes dielectric breakdown✓
B)Increased resolution due to broadened wavefunction
C)Mechanical resonance induces system instability
D)Thermoelectric effects saturate measurement accuracy
💡 Explanation
Dielectric breakdown occurs because beyond the alumina's potential the electric field is strong enough to force electrons through the insulating layer via dielectric breakdown, rather than quantum tunneling. Therefore, option A is correct rather than tunneling related options.
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