A different type of topological phase dubbed topological inverse Anderson insulators is proposed, which is characterized by the disorder-induced extended bulk states from the flat-band localization and topological edge states. Based on the topological invariant, the behaviors of the localization length of the zero-energy modes, and quantum transport, we identify its existence in several all-band-flat models with the disordered potentials or hopping including the π-flux Creutz ladder, the fully dimerized Su-Schrieffer-Heeger chain, and π-flux diamond chain. Unlike the topological Anderson insulator, where disorder induces localization and exponential suppression of transport, the disorder-assisted quantum ballistic coherent transport can appear in the topological inverse Anderson insulator. In addition, our proposal and results could be realized by the current experimental techniques.
@article{arxiv.2408.15826,
title = {Topological inverse Anderson insulator},
author = {Zheng-Wei Zuo and Jing-Run Lin and Dawei Kang},
journal= {arXiv preprint arXiv:2408.15826},
year = {2024}
}