Strong loss-gain in a staggered non-Hermitian SSH lattice turns all insulators into non-trivial topological insulators, passing through a gapless semi-metallic phase.
One such material that has been reported first in the literature is topo logical insulators
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An unusual phase transition in a non-Hermitian Su-Schrieffer-Heeger model
Strong loss-gain in a staggered non-Hermitian SSH lattice turns all insulators into non-trivial topological insulators, passing through a gapless semi-metallic phase.