1. Department of Physics, Eidgenössische Technische Hochschule Zürich 1 , 8092 Zurich, Switzerland
2. Theory and Simulations of Materials (THEOS), École Polytechnique Fédérale de Lausanne 2 , 1015 Lausanne, Switzerland
3. National Centre for Computational Design and Discovery of Novel Materials (MARVEL), École Polytechnique Fédérale de Lausanne 3 , 1015 Lausanne, Switzerland