Stephen M. Hayden^1,∥

• ¹H. H. Wills Physics Laboratory, University of Bristol, Bristol BS8 1TL, United Kingdom
• ²Diamond Light Source, Harwell Campus, Didcot OX11 0DE, United Kingdom

• ^*Contact author: ctam@ucsb.edu
• ^†Contact author: zhumen@phys.ethz.ch
• ^‡Present address: Laboratory for Solid State Physics, ETH Zürich, 8093 Zürich, Switzerland.
• ^§Present address: National Synchrotron Radiation Laboratory and School of Nuclear Science and Technology, University of Science and Technology of China, Hefei 230026, China.
• ^∥Contact author: s.hayden@bristol.ac.uk