• Corpus ID: 203627045

Superradiant phase transition with flat bands in a circuit QED lattice

  title={Superradiant phase transition with flat bands in a circuit QED lattice},
  author={Gui-Lei Zhu and Xin-you Lu and Hamidr{\'e}za Ram{\'e}zani and Clive Emary and Jin-Hua Gao and Ying Wu},
  journal={arXiv: Quantum Physics},
We investigate the interplay of superradiant phase transition (SPT) and energy band physics in an extended Dicke-Hubbard lattice whose unit cell consists of a Dicke model coupled to an atomless cavity. We found in such a periodic lattice the critical point that occurs in a single Dicke model becomes a critical region that is periodically changing with the wavenumber $k$. In the weak-coupling normal phase of the system we observed a flat band and its corresponding localization that can be… 

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