GoKawiilResearchers observe critical topological phase transition using acoustic metamaterial
Physicists used an acoustic metamaterial platform to experimentally demonstrate a 'critical topological phase transition,' a phenomenon where topological invariants remain well-defined even at the gapless critical point of a phase transition. They observed topological edge states along critical phase boundaries and confirmed criticality through logarithmic scaling of entanglement entropy, including an additive scaling pattern at a special multicritical point where distinct critical boundaries intersect.