Photonic topological Anderson insulator in a two-dimensional atomic lattice

• URL: http://arxiv.org/abs/2212.05046v2
• Date: Fri, 21 Apr 2023 14:20:46 GMT
• Title: Photonic topological Anderson insulator in a two-dimensional atomic lattice
• Authors: Sergey E. Skipetrov and Pierre Wulles
• Abstract summary: Disorder in atomic positions can induce a topologically nontrivial phase - topological insulator (TAI) TAI requires both time-reversal and inversion symmetries to be broken to similar extents. A transition from TAI to the topological insulator (TI) phase can take place at a constant value of the topological invariant.
• Score: 0.0
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: Disorder in atomic positions can induce a topologically nontrivial phase - topological Anderson insulator (TAI) - for transverse electric optical quasimodes of a two-dimensional honeycomb lattice of immobile atoms. TAI requires both time-reversal and inversion symmetries to be broken to similar extents. It is characterized by a nonzero topological invariant, a reduced density of states and spatially localized quasimodes in the bulk, as well as propagating edge states. A transition from TAI to the topological insulator (TI) phase can take place at a constant value of the topological invariant, showing that TAI and TI represent the same topological phase.

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