Regul, J.; Keyser, U.F.; Paesler, M.; Hohls, F.; Zeitler, U. et al.: Fabrication of quantum point contacts by engraving GaAs/AlGaAs heterostructures with a diamond tip. In: Applied Physics Letters 81 (2002), Nr. 11, S. 2023-2025. DOI:
https://doi.org/10.1063/1.1506417
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. © 2002 American Institute of Physics.
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License of this version: |
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Publication type: |
Article |
Publishing status: |
publishedVersion |
Publication date: |
2002 |
Keywords english: |
Atomic force microscopes, Defect-free, Diamond tip, Electronic transport measurements, GaAs/AlGaAs heterostructures, High quality, Orders of magnitude, Processing Time, Quantum point contact, Silicon tips, Atomic force microscopy, Crystals, Diamonds, Etching, Quantum chemistry, Point contacts
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DDC: |
530 | Physik
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