Abstract
Utilizing both the electric and magnetic fields to manipulate electron dynamics enables the external control of topological states. This study investigates the topological characteristics of a quasi-one-dimensional ladder lattice subjected to a time-periodic electric field and a constant magnetic field. The Floquet topological phases are determined in the high-frequency approximation. In the absence of a magnetic field (φ = 0), the energy band diagram is modulated by the electric field parameter α/ℏω , leading to a topological phase transition when α/ℏω crosses the value of 1. When a magnetic field is present ( ϕ=π ), the topological phase transitions in the ladder model are influenced by both the electric field parameter α/ℏω and the perpendicular hopping t 0, resulting in a diverse range of adjustable topological states. These discoveries offer promising prospects for the utilization of ladder lattice systems with externally modifiable topological properties.
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