Can a solid be a superfluid? Engineering a novel supersolid state from layered 2D materials

https://phys.org/news/2023-03-solid-superfluid-supersolid-state-layered.html

"rigid crystal flows without friction, all belong to 1 quantum state... supersolid simultaneously has 2 orders, superconductor (super: particles can flow without resistance) and solid (spatially repeating pattern of particles)... 2D) semiconductor structure 2 conducting layers  (1  doped with negatively-charged electrons and other with positively-charged holes) separated by insulating barrier... supersolid pre-empts non-super exciton solid...  non-super exciton wins, and quantum coherence collapses"

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Dynamics of molecular rotors in bulk superfluid helium

https://phys.org/news/2023-07-dynamics-molecular-rotors-bulk-superfluid.html

Concave, umbrella-like metal complexes provide space for giant molecular rotors to operate in solid state

https://phys.org/news/2023-09-concave-umbrella-like-metal-complexes-space.html