2023/11/08 by Suman Aich, Babak Seradjeh · 1 voice
Materials Science · Physics and Astronomy · #Graphene research and applications #Photonic Crystals and Applications #Topological Materials and Phenomena #cond-mat.mes-hall
paper · pdf · doi:10.1103/physrevb.110.054314
arxiv published 2023/11/08 · openalex publication_date 2024/08/27 · openalex created_date 2024/08/28 · arxiv updated 2024/08/29 · openalex updated_date 2026/08/01
We report the theoretical discovery of multiple real-space degenerate Floquet-Bloch states in monolayer graphene coherently driven by twisted circularly polarized light. Using Floquet theory, we characterize the real-space structure of quasienergies and Floquet modes in terms of the orbital angular momentum and radial vortex profile of light. We obtain the effective real-space Floquet Hamiltonian and show it supports crossings of Floquet modes, especially at high-symmetry K and \mathrm\ensuremathΓ points of graphene, localized at rings around the vortex center. At specific frequencies, the vortex bound states form a multiply degenerate structure in real space. This structure is purely dynamically generated and controlled by the frequency and tuned by the intensity of twisted light. We discuss the experimental feasibility of observing and employing multiple real-space degeneracies for coherent optoelectronic quantum state engineering.