Charge rearrangement and screening in a quantum point contact |
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Authors: | Lüscher S Moore L S Rejec T Meir Yigal Shtrikman Hadas Goldhaber-Gordon D |
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Institution: | Department of Physics, Stanford University, Stanford, CA 94305, USA. |
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Abstract: | 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. |
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