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New material platform in TOPSQUAD: germanium quantum wells

The Ge quantum wells are studied in TOPSQUAD as a new material platform next to the Ge-Si core-shell nanowires. These Ge quantum wells are particularly attractive in terms of scalability. The large out of plane g-factors in this material have been recentely reported in Nature Materials by Katsaros group from IST Austria. The large out of plane g-factors and the strong spin-orbit coupling (similar to what has been reported for III-V materials), makes these Ge hole gases a suitable platform for investigating topological superconductivity. Furthermore, recent theory papers suggest that such two dimensional hole gases have a very strong spin-orbit coupling, in line with the measurements performed at IST.