Kavli Affiliate: Giordano Scappucci
| First 5 Authors: Christian M. Moehle, Chung Ting Ke, Qingzhen Wang, Candice Thomas, Di Xiao
| Summary:
Topological superconductivity can be engineered in semiconductors with strong
spin-orbit interaction coupled to a superconductor. Experimental advances in
this field have often been triggered by the development of new hybrid material
systems. Among these, two-dimensional electron gases (2DEGs) are of particular
interest due to their inherent design flexibility and scalability. Here we
discuss results on a 2D platform based on a ternary 2DEG (InSbAs) coupled to
in-situ grown Aluminum. The spin-orbit coupling in these 2DEGs can be tuned
with the As concentration, reaching values up to 400 meV$unicode{xC5}$, thus
exceeding typical values measured in its binary constituents. In addition to a
large Land’e g-factor $sim$ 55 (comparable to InSb), we show that the clean
superconductor-semiconductor interface leads to a hard induced superconducting
gap. Using this new platform we demonstrate the basic operation of
phase-controllable Josephson junctions, superconducting islands and quasi-1D
systems, prototypical device geometries used to study Majorana zero modes.
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