Periodic and Aperiodic Bunching in the Addition Spectra of Quantum Dot

Details Periodic and Aperiodic Bunching in the Addition Spectra of Quantum Dot Periodic and Aperiodic Bunching in the Addition Spectra of Quantum Dot

1997-03-27

arxiv.org/abs/cond-mat/9703241v1

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

4 pages, 2 figures. Submitted to PRL

Scientific paper

10.1103/PhysRevLett.79.2308

We study electron addition spectra of quantum dots in a broad range of electron occupancies starting from the first electron. Spectra for dots containing <200 electrons reveal a surprising feature. Electron additions are not evenly spaced in gate voltage. Rather, they group into bunches. With increasing electron number the bunching evolves from occurring randomly to periodically at about every fifth electron. The periodicity of the bunching and features in electron tunneling rates suggest that the bunching is associated with electron additions into spatially distinct regions within the dots.

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