Applied Materials Physics, Department of Material Science and Engineering, The Royal Institute of Technology, Stockholm, 10044 Sweden ; Condensed Matter Theory Group, AlbaNova University Center, The Royal Institute of Technology, Stockholm, 10691 Sweden
Condensed Matter Theory Group, Department of Physics, Uppsala University, Uppsala, 75121 Sweden
Condensed Matter Theory Group, Department of Physics, Uppsala University, Uppsala, 75121 Sweden
Applied Materials Physics, Department of Material Science and Engineering, The Royal Institute of Technology, Stockholm, 10044 Sweden ; Condensed Matter Theory Group, Department of Physics, Uppsala University, Uppsala, 75121 Sweden
Theoretical Division, Los Alamos National Laboratory, Los Alamos, NM 87545 United States
Applied Physics Division, Los Alamos National Laboratory, Los Alamos, NM 87545 United States