1. Hunter College, 695 Park Avenue, New York, New York 10065, USA
2. CUNY Graduate Center, 365 Fifth Avenue, New York, New York 10016, USA
3. Laboratoire de Physique des Solides, UMR 8502, CNRS, Univ. Paris-Sud, Université Paris-Saclay, 91405 Orsay Cedex, France
4. Laboratoire Léon Brillouin, CNRS-CEA UMR12, Université Paris-Saclay, CEA Saclay, 91191 Gif-sur-Yvette, France
5. Helmholtz Institute Ulm (HIU), Helmholtzstr. 11, D-89081 Ulm, Germany
6. Karlsruher Institut für Technologie (KIT), P.O. Box 3640, D-76021 Karlsruhe, Germany