Controlling Dissipative Topology Through Floquet Driving: From Transient Diagnostics to Boundary States Isolation

TL;DR

This paper demonstrates how Floquet driving can manipulate dissipative topological phases in open quantum systems, enabling dynamic control and isolation of boundary modes through a novel diagnostic framework based on the Liouvillian skin effect and localization properties.

Contribution

It introduces a Floquet-Lindblad scheme to control and diagnose dissipative topological phases, revealing drive-induced transitions and scale-free localization phenomena.

Findings

Drive-induced unipolar-bipolar transition in Liouvillian skin effect

Identification of a new invariant via polarization drift

Observation of scale-free localization with coexisting skin and extended modes

Abstract

Engineering dissipative dynamics in open quantum systems is under active focus, especially in topological settings where resilient edge modes are expected to exhibit decay rates distinct from the bulk. In this letter, we propose an efficient dynamical scheme to discern such long-lived excitations. Employing a Floquet-Lindblad framework, we explore how periodic driving reshapes the key features of a paradigmatic topological model, namely a Creutz ladder. Our results bear testimony to a drive-induced unipolar-bipolar transition in the Liouvillian skin effect, which gets dynamically manifested as a chiral-helical damping crossover. Such a transition effectively rescales the bulk localization length, giving rise to a polarization drift that we identify as a new invariant for efficient diagnosis of the nontrivial phases. As the transition becomes more gradual via tuning drive-rescaled parameters, we uncover signatures of a scale-free localization where skin and extended modes co-exist with distinct decay rates. The emergent hierarchy of the decay rates yields two disparate timescales: a chiral wavefront that rapidly empties the bulk followed by a long-lived regime dominated by robust edge modes. Overall, our results provide convincing evidence that periodic driving serves as a powerful handle to manipulate dissipative topological phases and dynamically isolate the boundary modes.