Which mechanism dictates electron transport through a quantum dot transistor leading to single-electron tunneling?

💡 Explanation

When an electron attempts to enter the quantum dot, Coulomb blockade arises because the existing electrons repel the incoming electron due to electrostatic forces, preventing further electrons from entering until the applied voltage overcomes that repulsion. Therefore, Coulomb blockade dictates electron tunneling, rather than high temperature distributions, uncertainty limits, or exclusion interference which do not directly restrict electron number.

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