1. Institute of Semiconductor Nanoelectronics, Peter Grünberg Institute (PGI 9) and JARA-Fundamentals of Future Information Technologies, Forschungszentrum
Jülich, 52428, Germany
2. Laboratory for Micro- and Nanotechnology
(LMN), Paul Scherrer Institute
, CH-5232
Villigen, Switzerland
3. Institute of Integrated Photonics, RWTH Aachen
, 52074
Aachen, Germany
4. National
Institute of Materials Physics, P.O. Box MG-7, Magurele, Bucharest
077125, Romania
5. Univ. Grenoble Alpes and CEA, LETI, MINATEC Campus, Grenoble, France
6. Institute of Microwaves
and Photonics, School of Electronic and Electrical Engineering, University of Leeds
, Leeds
LS2 9JT, United Kingdom