InSbAs two-dimensional electron gases as a platform for topological superconductivity
van de Kerkhof, V.
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 meVÅ, thus exceeding typical values measured in its binary constituents. In addition to a large Landé g-factor ∼ 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.
Two-dimensional electron gas
To reference this document use:
High Tech Systems & Materials
American Chemical Society ACS, Washington DC, USA
NANO letters, 21 (21), 9990-9996