2020/05/15 by Milad Jangjan, Jangjan, Milad, Mir Vahid Hosseini +1
Physics and Astronomy · #FOS: Physical sciences #Magnetic properties of thin films #Mesoscale and Nanoscale Physics (cond-mat.mes-hall) #Quantum and electron transport phenomena #Topological Materials and Phenomena
paper · pdf · doi:10.48550/arxiv.2005.07529
openalex publication_date 2020/05/15 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
We consider asymmetric and symmetric dimerized two-leg ladders, comprising of\nfour different lattice points per unit cell, illuminated by circularly\npolarized light. In the asymmetric dimerized ladder case, rungs are not\nperpendicular to the ladder's legs whereas the rungs are perpendicular to the\nlegs for the symmetric one. Using the Floquet theory, we obtain an effective\nHamiltonian to study topological properties of the systems. Depending on the\ndimerization strength and driving amplitude, it is shown that topologically\nprotected edge states manifest themselves not only as a zero-energy band within\nthe gap between conduction and valence band but also as finite-energy curved\nbands inside the gap of subbands. The latter one can penetrate into bulk states\nand hybridize with the bulk states revealing hybridized Floquet topological\nmetal phase with delocalized edge states in the asymmetric ladder case.\nHowever, in the symmetric ladder, the finite-energy edge states while remaining\nlocalized can coexist with the extended bulk states manifesting Floquet\ntopological metal phase.\n