1. Fabrication of quantum point contacts by engraving GaAs/AlGaAs heterostructures with a diamond tip
- Author
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J. Regul, Egbert Oesterschulze, Ulrich F. Keyser, Dirk Reuter, F. Hohls, Rolf J. Haug, A. Malavé, Uli Zeitler, Andreas D. Wieck, and M. Paesler
- Subjects
Fabrication ,Physics and Astronomy (miscellaneous) ,Silicon ,FOS: Physical sciences ,chemistry.chemical_element ,engineering.material ,High quality ,Engraving ,Crystals ,Silicon tips ,Defect-free ,Atomic force microscopy ,Mesoscale and Nanoscale Physics (cond-mat.mes-hall) ,GaAs/AlGaAs heterostructures ,ddc:530 ,Point contacts ,Quantum point contact ,Physics ,Atomic force microscopes ,Diamonds ,Condensed Matter - Mesoscale and Nanoscale Physics ,business.industry ,Electronic transport measurements ,Processing Time ,Conductance ,Diamond ,Heterojunction ,Condensed Matter::Mesoscopic Systems and Quantum Hall Effect ,Orders of magnitude ,Etching ,chemistry ,visual_art ,engineering ,visual_art.visual_art_medium ,Optoelectronics ,Dewey Decimal Classification::500 | Naturwissenschaften::530 | Physik ,Diamond tip ,Anomaly (physics) ,business ,Quantum chemistry ,Order of magnitude - 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., Comment: 3 pages, 3 figures
- Published
- 2002
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