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← ScienceWhich mechanism limits electron current when multiple quantum dots are closely spaced forming artificial molecule?
A)Coulomb blockade from electron repulsion✓
B)Phonon scattering impeding electron flow
C)Thermal radiation of electron energy
D)Increased electron orbital hybridization
💡 Explanation
When quantum dots are closely spaced, added electrons repel others through Coulomb blockade because the confined region's Coulomb energy increases significantly, restricting the number of electrons that can occupy the quantum dot artificial molecule. Therefore, Coulomb blockade primarily limits current, rather than scattering, radiation or orbital hybridization, which are weaker effects.
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