Communication Dans Un Congrès Année : 2024

Topological photonics in planar atomic lattices

Résumé

We consider the band structure and topological properties of planar arrays of cold (immobile) two-level atoms interacting via the electromagnetic field. A band gap can be opened in the spectrum of a honeycomb lattice of atoms by either applying an external magnetic field, making the two atoms of the unit cell of the honeycomb lattice viewed as a triangular lattice with a two-atom unit cell, different from each other, or by deforming the lattice in a particular way. For certain combinations of parameters, the band gap is characterized by a nontrivial topological invariant, which results in the appearance of topologically protected edge modes for a lattice of finite size. These modes are robust to disorder in atomic positions as far as the gap remains open. Interestingly, disorder itself can induce a topologically nontrivial state termed a “topological Anderson insulator” in a lattice that otherwise would be topologically trivial. The considered atomic system provides a playground for studying the interplay between disorder and topology in photonics.

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Dates et versions

hal-04777994 , version 1 (12-11-2024)

Identifiants

  • HAL Id : hal-04777994 , version 1

Citer

Sergey E. Skipetrov, Pierre Wulles. Topological photonics in planar atomic lattices. International Workshop on Disordered Systems - IWDS2024, Mario Amado; Enrique Diez; Manuel Pino; Alberto Rodríguez, Jun 2024, Salamanca, Spain. ⟨hal-04777994⟩

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