Physics – Condensed Matter – Mesoscale and Nanoscale Physics
Scientific paper
2011-06-15
New J. Phys. 13 (2011) 113006
Physics
Condensed Matter
Mesoscale and Nanoscale Physics
Scientific paper
10.1088/1367-2630/13/11/113006
Quantum point contacts are fundamental building blocks for mesoscopic transport experiments and play an important role in recent interference- and fractional quantum Hall experiments. However, it is not clear how electron-electron interactions and the random disorder potential influence the confinement potential and give rise to phenomena like the mysterious 0.7 anomaly. Novel growth techniques of GaAs/AlGaAs heterostructures for high-mobility two-dimensional electron gases enable us to investigate quantum point contacts with a strongly suppressed disorder potential. These clean quantum point contacts indeed show transport features that are obscured by disorder in standard samples. From this transport data, we are able to extract the parameters of the confinement potential which describe its shape in longitudinal and transverse direction. Knowing the shape (and hence the slope) of the confinement potential might be crucial to predict which interaction-induced states can form in quantum point contacts.
Ardelt P.-L.
Baer S.
Ensslin Klaus
Ihn Thomas
Reichl Christian
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