Flat-Band Localization in Creutz Superradiance Lattices

Yanyan He, Ruosong Mao, Han Cai, Jun-Xiang Zhang, Yongqiang Li, Luqi Yuan, Shi-Yao Zhu, and Da-Wei Wang

Flat bands play an important role in diffraction-free photonics and attract fundamental interest in many-body physics. Here we report the engineering of flat-band localization of collective excited states of atoms in Creutz superradiance lattices with tunable synthetic gauge fields. Magnitudes and phases of the lattice hopping coefficients can be independently tuned to control the state components of the flat band and the Aharonov-Bohm phases. We can selectively excite the flat band and control the flat-band localization with the synthetic gauge field. Our study provides a room-temperature platform for flat bands of atoms and holds promising applications in exploring correlated topological materials.

Phys. Rev. Lett. 126, 103601 

The published article is available at https://journals.aps.org/prl/abstract/10.1103/PhysRevLett.126.103601