Charge rearrangement and screening in a quantum point contact

S. Lüscher, L. S. Moore, T. Rejec, Yigal Meir, Hadas Shtrikman, D. Goldhaber-Gordon

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Compressibility measurements are performed on a quantum point contact (QPC). Screening due to mobile charges in the QPC is measured quantitatively, using a second point contact. These measurements are performed from pinch-off through the opening of the first few modes in the QPC. While the measured signal closely matches a Thomas-Fermi-Poisson prediction, deviations from the classical behavior are apparent near the openings of the different modes. Density functional calculations attribute the deviations to a combination of a diverging density of states at the opening of each one-dimensional mode and exchange interaction, which is strongest for the first mode.

Original languageEnglish
Article number196805
JournalPhysical Review Letters
Issue number19
StatePublished - 11 May 2007


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