Emergence of ferromagnetism at onset Kondo breakdown in moiré bilayer lattices

phys.org

8 pointswglb3 comments

The graph in the first figure shows negative Kelvin.. Can someone explain how that is possible?

Temperature measures entropy as a systems energy changes. This is a system where the high energy state is less entropic.

Is this related to lasers behaving as as a body with negative temperature when they manage to heat something to a hotter temperature by radiation?