1. Advanced Research Center for Nanolithography (ARCNL), Science Park 110, 1098 XG Amsterdam, The Netherlands
2. Zernike Institute for Advanced Materials, University of Groningen, Nijenborgh 4, 9747 AG Groningen, The Netherlands
3. Van der Waals-Zeeman Instituut, University of Amsterdam, Science Park 904, 1098 XH Amsterdam, The Netherlands
4. AMOLF, Science Park 104, 1098 XG Amsterdam, The Netherlands
5. Department of Physics and Astronomy, Vrije Universiteit, De Boelelaan 1081, 1081 HV Amsterdam, The Netherlands