Fabrication and measurement of hybrid quantum dot devices featuring Yu-Shiba-Rusinov sub-gap states

Abstract

The aim of this bachelor project is to fabricate and study hybrid quantum dot (QD) devices featuring Yu-Shiba-Rusinov (YSR) sub-gap
states, made on special InAs nanowires with 7 nm epitaxial aluminum coating on 3 facets. The advantage with these nanowires is the
epitaxial aluminum, which can be etched away in a small window of semiconducting nanowire for creating QDs. These dots can be used for
measuring the sub-gap states in superconducting materials due to the high degree of tunability. A device with a single QD featuring
YSR sub-gap states was fabricated and analyzed, and a double QD system was afterwards made from the device using superconducting
leads in the normal state, but not yet featuring YSR sub-gap states. The device does show the possibility for making an superconductordouble
dot-superconductor device featuring YSR sub-gap states.