Fabrication of quantum point contacts by engraving GaAs/AlGaAs heterostructures with a diamond tip

authored by: J. Regul, U. F. Keyser, M. Paesler, F. Hohls, U. Zeitler, R. J. Haug, A. Malavé, E. Oesterschulze, D. Reuter, A. D. Wieck
Abstract: We use the all-diamond tip of an atomic force microscope for the direct engraving of high-quality quantum point contacts in GaAs/AlGaAs heterostructures. The processing time is shortened by two orders of magnitude compared to standard silicon tips. Together with a reduction of the line width to below 90 nm, the depletion length of insulating lines is reduced by a factor of two with the diamond probes. The such fabricated defect-free ballistic constrictions show well-resolved conductance plateaus and the 0.7 anomaly in electronic transport measurements.
Organisation(s): Institute of Solid State Physics
External Organisation(s): University of Kassel
Ruhr-Universität Bochum
Type: Article
Journal: Applied physics letters
Volume: 81
Pages: 2023-2025
No. of pages: 3
ISSN: 0003-6951
Publication date: 09.09.2002
Publication status: Published
Peer reviewed: Yes
ASJC Scopus subject areas: Physics and Astronomy (miscellaneous)
Electronic version(s): https://doi.org/10.1063/1.1506417 (Access: Unknown)