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Experimental observation of critical topology
Nature • • science
Key Points:
- Researchers have experimentally demonstrated critical gapless topological states characterized by entanglement spectrum and entanglement wavefunctions in both one- and two-dimensional systems using engineered phononic crystals.
- This study bridges the gap between conventional continuous phase transitions and abrupt topological phase transitions, revealing a fundamental connection between topology and criticality.
- The experiments, conducted on a classical platform but equivalent to quantum systems, enable direct imaging of topological boundary modes within gapless bulk continua.
- Findings highlight topology-driven multi-criticality and a hierarchical structure of topological phases, showing that phase boundaries with distinct critical topology lead to multi-critical points in the phase diagram.
- This work opens new experimental pathways for exploring topological physics at phase transitions, extending theoretical predictions beyond one-dimensional quantum systems to higher dimensions.
