Dynamic Polarization Control of Nonlinear Terahertz Photoresponse via Topological Phase Transitions.

ABSTRACT: Precise modulation of topologically protected states via external stimuli, such as electric, optical, and magnetic fields, is a cornerstone for advancing robust topological photonics and quantum technologies. However, the realization of dynamic and noninvasive control remains constrained by the high-energy thresholds of conventional stimuli, which can disrupt delicate topological states. Here, we employ low-energy terahertz excitation to directly probe the photoresponse across a temperature-induced topological phase transition in ultrathin ZrTe₅, a material at the intersection of topological physics and low-dimensional systems, leveraging its unique ability to interact with low-energy quasiparticle states without compromising coherence in the system. We observe a giant and robus

SUBMITTER: Zhang L 

PROVIDER: S-EPMC12460995 | biostudies-literature | 2025

REPOSITORIES: biostudies-literature