Interaction-induced doublons and embedded topological subspace in a complete flat-band system
Interaction-induced doublons and embedded topological subspace in a complete flat-band system
In this work, we investigate effects of weak interactions on a bosonic complete flat-band system. By employing a band projection method, the flat-band Hamiltonian with weak interactions is mapped to an effective Hamiltonian. The effective Hamiltonian indicates that doublons behave as well-defined quasi-particles, which acquire itinerancy through the hopping induced …