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.
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