*Maciej Zgirski¹, Marek Foltyn¹, Alexander Savin², Konrad Norowski¹ (1. Polish Academy of Sciences, Institute of Physics, 2. Low Temperature Laboratory, Department of Applied Physics, Aalto University School of Science)

*Lucia Steinke¹, Alexander Donald¹, Andrew John Woods², Rasul Gazizulin¹ (1. University of Florida, 2. Los Alamos National Laboratory)

*Alexander Kirste¹, Andrew Casey², Jost Engert¹, Lev V. Levitin² (1. Physikalisch-Technische Bundesanstalt (PTB), 2. Department of Physics, Royal Holloway University of London)

*Atsushi Miyake¹, Masaki Gen², Akihiko Ikeda³, Yuto Kinoshita¹, Dai Aoki⁴, Masashi Tokunaga¹ (1. Institute for Solid State Phsyics, The University of Tokyo, 2. Department of Advanced Materials Science, The University of Tokyo, 3. Department of Engineering Science, University of Electro-Communications, 4. Institute for Materials Research, Tohoku University)