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We report an experimental study of the disordered Su-Schrieffer-Heeger (SSH)model, implemented in a system of coaxial cables, whose radio frequencyproperties map on to the SSH Hamiltonian. By measuring multiple chains withrandom hopping terms, we demonstrate the presence of a topologically protectedstate, with frequency variation of less than 0.2% over the ensemble. Connectingthe ends of the chains to form loops, we observe a topological phasetransition, characterised by the closure of the band gap and the appearance ofstates which are delocalised, despite the strong disorder.

Observation of a Topological Phase Transition in Random Coaxial Cable Structures with Chiral Symmetry