Imaging interaction effects in semiconducting nanowires and their superconducting hybrids
CIC nanoGUNE Seminars
- Speaker
-
Haim Bedenkopf
- When
-
2018/09/03
13:00 - Place
- nanoGUNE seminar room, Tolosa Hiribidea 76, Donostia - San Sebastian
- Add to calendar
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Electrons confined to one dimension exhibit various counter-intuitive
phenomena. We study semiconducting InAs nanowires in scanning tunnelling
spectroscopy. By maintaining the MBE grown nanowires under ultra-high vacuum
we are able to atomically resolve their facets and spectroscopically
investigate their quasi-one-dimensional electronic states. We find a non-
monotonic energy evolution of the phase coherence of hot electrons in one
dimension [J. Reiner, et al., PRX 7, 021016 (2017)]. A theoretical model
reveals that the origin of this unique energy-evolution of phase coherence
lies in the form of the Coulomb interaction in one-dimension together with the
non-linear electronic dispersion. We further study superconducting (aluminium)
quantum dots grown epitaxially on the InAs nanowires. The barrier at the
Al/InAs interface along with the tip of the STM form a double barrier
tunnelling junction, featuring Coulomb gap and charging resonances. This
regime allows us to extract the properties of the buried Al/InAs interface
including the tunnelling energy barrier across the interface and the band
bending at its vicinity. The potential for measurements of topological
superconductivity will be discussed.
**Host** : R. Calvo