1. CIC nanoGUNE BRTA Tolosa Hiribidea, 76 Donostia‐San Sebastian Basque Country 20018 Spain
2. IHP–Leibniz‐Institut für innovative Mikroelektronik Im Technologiepark 25 15236 Frankfurt (Oder) Germany
3. State Key Laboratory of Superlattices and Microstructures Institute of Semiconductors Chinese Academy of Sciences Beijing 100083 China
4. Center of Materials Science and Optoelectronics Engineering & CAS Center of Excellence in Topological Quantum Computation University of Chinese Academy of Sciences Beijing 100190 China
5. Istituto Italiano di Tecnologia Via Morego 30 Genova 16163 Italy