Topological transitions and Anderson localization of light in disordered atomic arrays

• URL: http://arxiv.org/abs/2112.14673v2
• Date: Thu, 7 Apr 2022 10:11:55 GMT
• Title: Topological transitions and Anderson localization of light in disordered atomic arrays
• Authors: S.E. Skipetrov and P. Wulles
• Abstract summary: We study the interplay of disorder and topological phenomena in honeycomb lattices of atoms coupled by the electromagnetic field. On the one hand, disorder can trigger insulator transitions between distinct topological phases and drive the lattice into the topological Anderson state. We find that disorder can both open a topological pseudogap in the spectrum of an otherwise topologically trivial system and introduce spatially localized modes inside it.
• Score: 0.0
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: We explore the interplay of disorder and topological phenomena in honeycomb lattices of atoms coupled by the electromagnetic field. On the one hand, disorder can trigger transitions between distinct topological phases and drive the lattice into the topological Anderson insulator state. On the other hand, the nontrivial topology of the photonic band structure suppresses Anderson localization of modes that disorder introduces inside the band gap of the ideal lattice. Furthermore, we discover that disorder can both open a topological pseudogap in the spectrum of an otherwise topologically trivial system and introduce spatially localized modes inside it.

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