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The conductance of laterally confined double-barrier quantum-well resonant-tunneling heterostructures is investigated. The confinement is provided by a Schottky gate and can be varied in a continuous way, giving direct proof of the quantum-size effect. Data for dots with nominal diameters in the submicrometer range are reported. Possible evidence for a modulation of the Coulomb blockade by quantum confinement is presented.
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Guéret et al. (1992) studied this question.
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