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Zero-dimensional states and single electron charging in quantum dots

1992; American Physical Society; Volume: 69; Issue: 10 Linguagem: Inglês

10.1103/physrevlett.69.1592

1092-0145

A. T. Charlie Johnson, Leo P. Kouwenhoven, Wim de Jong, N. C. van der Vaart, C. J. P. M. Harmans, C. T. Foxon,

Advancements in Semiconductor Devices and Circuit Design

We observe new transport effects in lateral quantum dots where zero-dimensional (0D) states and single electron charging coexist. In linear transport we see coherent resonant tunneling, described by a Landauer formula despite the many-body charging interaction. In the nonlinear regime, Coulomb oscillations of a quantum dot with about 25 electrons show structure due to 0D excited states as the bias voltage increases, and the current-voltage characteristic has a double-staircase shape.