InSbAs two-dimensional electron gases as a platform for topological superconductivity

Majorana zero modes, the fundamental building blocks of topologically protected qubits, can be realized in semiconductor-superconductor hybrid systems. Two-dimensional electron gases (2DEGs) with strong spin-orbit coupling offer a scalable platform for Majorana devices. Here, we investigate a new 2D hybrid system consisting of ternary InSbAs 2DEGs with epitaxially grown aluminum. Studying Josephson junctions in these systems allows us to estimate a large induced gap (200 μeV) and high interface transparencies (≈0.9). Furthermore, through weak anti-localization and quantum Hall measurements, we show that InSbAs has exceptionally strong spin-orbit interaction and a g-factor comparable to pure InSb. This unique combination of properties make InSbAs/Al 2DEGs a promising platform to study topological superconductivity.