InSbAs Two-Dimensional Electron Gases as a Platform for Topological Superconductivity
Christian M. Moehle (TU Delft - QuTech Advanced Research Centre, TU Delft - QRD/Goswami Lab, Kavli institute of nanoscience Delft)
C. Ke (TU Delft - QRD/Goswami Lab, Kavli institute of nanoscience Delft, TU Delft - QuTech Advanced Research Centre)
Qingzhen Wang (TU Delft - QRD/Goswami Lab, TU Delft - QuTech Advanced Research Centre, Kavli institute of nanoscience Delft)
Di Xiao (Purdue University)
Saurabh Karwal (TU Delft - BUS/TNO STAFF, TU Delft - QuTech Advanced Research Centre)
Mario Lodari (Kavli institute of nanoscience Delft, TU Delft - QCD/Scappucci Lab, TU Delft - QuTech Advanced Research Centre)
Vincent Van De Kerkhof (Kavli institute of nanoscience Delft, External organisation)
Ruben Termaat (Student TU Delft, Kavli institute of nanoscience Delft)
Giordano Scappucci (TU Delft - QuTech Advanced Research Centre, Kavli institute of nanoscience Delft, TU Delft - QCD/Scappucci Lab)
Srijit Goswami (Kavli institute of nanoscience Delft, TU Delft - QuTech Advanced Research Centre, TU Delft - QRD/Goswami Lab)
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Abstract
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 Å, thus exceeding typical values measured in its binary constituents. In addition to a large Landé g-factor of ∼55 (comparable to that of 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.