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

verfasst von

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.

Organisationseinheit(en)

Institut für Festkörperphysik

Externe Organisation(en)

Universität Kassel
Ruhr-Universität Bochum

Typ

Artikel

Journal

Applied physics letters

Band

81

Seiten

2023-2025

Anzahl der Seiten

3

ISSN

0003-6951

Publikationsdatum

09.09.2002

Publikationsstatus

Veröffentlicht

Peer-reviewed

Ja

ASJC Scopus Sachgebiete

Physik und Astronomie (sonstige)

Elektronische Version(en)

https://doi.org/10.1063/1.1506417 (Zugang: Unbekannt)