Since they are asking for an example of something. however it already has the maximum number of tags, which is 5. I see nothing in the question requiring that the sought model describes an
insulator. Do you think the
topological-insulators tag needs to be there? Out of all of the tags there, it seems to me that this one is the one that would be most appropriate to replace. But this seems to be more in your area of research than mine!
