Analysis of superconducting Sn/Ti contacts to GaAs/AlGaAs heterostructures by electron focusing
| Autor: | Gao, J. R., Kerkhof, J. J. B., Marc Verwerft, Magnée, P., Wees, B. J., Klapwijk, T. M., Hosson, J. Th M. |
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| Přispěvatelé: | Faculty of Science and Engineering, Zernike Institute for Advanced Materials, Photophysics and OptoElectronics, Physics of Nanodevices, Surfaces and Thin Films |
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| Zdroj: | Scopus-Elsevier Semiconductor Science and Technology, 11(4), 621-624 |
| Popis: | Tin-based superconducting contacts have been successfully made to GaAs/AlGaAs heterostructures in several groups. To identify whether the superconductor contacts directly with the two-dimensional electron gas (2DEG), we study the electronic properties underneath the contact locally by means of an electron focusing technique in a GaAs/AlGaAs device which consists of a Sn/Ti contact and two quantum point contacts, The observation of classical focusing peaks shows the presence of a 2DEG under the contact. Together with inspection by cross-sectional electron microscopy, we conclude that the superconducting contacts are formed not in the 2DEG but somewhere above the 2DEG. |
| Databáze: | OpenAIRE |
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