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In a single-electron transistor, which outcome limits current when the gate voltage is finely tuned?

A)Coulomb blockade dominates transport
B)Thermal expansion reduces junction barriers
C)Resonant frequency becomes mismatched
D)Parasitic capacitance bypasses tunneling

💡 Explanation

The Coulomb blockade prevents current flow because electron tunneling is inhibited until the charging energy of the quantum dot matches the applied voltage. Therefore, current is limited by Coulomb blockade, rather than bypass capacitance under strong confinement.

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