In a strongly disordered Su-Schrieffer-Heeger chain, the phase is controlled by the ratio of disorder strengths sigma_v/sigma_w, and the transition at sigma_v=sigma_w is an infinite-randomness fixed point with effective central charge ln 2.
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Topological Phase Transition under Infinite Randomness
In a strongly disordered Su-Schrieffer-Heeger chain, the phase is controlled by the ratio of disorder strengths sigma_v/sigma_w, and the transition at sigma_v=sigma_w is an infinite-randomness fixed point with effective central charge ln 2.