Which mechanism limits minimizing a quantum dot's size below the exciton Bohr radius?

💡 Explanation

When a quantum dot's size falls below the exciton Bohr radius, increased quantum confinement sharply raises the energy levels and momentum uncertainty due to Heisenberg's principle, disrupting the electron-hole pair. Therefore, quantum confinement energy prevents further size reduction, rather than plasmon resonance, scattering effects, or dielectric screening which become dominant in larger quantum dots.

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