I'm not sure. Most of the articles I've seen about this so far are pretty skimpy on details.
What I think is most interesting about it is how long now physicists have been saying that electrons are 'fundamental' particles, and now we see that this isn't exactly true, though they are calling them 'quasiparticles'.
Personally, I don't believe any particle is fundamental and indivisible. Like the man sez, "it's turtles all the way down".
Well - we’ve known for some time that there were quarks, leptons, bosons, gluons, etc. But those were all out of the nucleus of the atom. I think a proton was 2 or 3 quarks - my degree was physics but it’s so dated(’89)its like cell phones to a telegraph key.
What I find more interesting is the idea that adding energy causes the seperation. It makes understanding the field/energy state vs particle discussion on how electrons and photons act as energy vs mass depending on what your looking at a much easier discussion to have.
When you look at it one way your only seeing a certain subatomic particles interactions/aspect, whereas another subatomic particles interactions/aspect (in the same photon or electron) is seen in a different way because it is interacting with it’s space in a different way.