GIST Scholar
College of Natural Sciences
Department of Physics and Photon Science
1. Journal Articles
On-chip terahertz emission from Floquet-Bloch states
- Type
- Article
- Citation
- Optical Materials Express, v.15, no.8, pp.1765 - 1776
- Issued Date
- 2025-08
- Abstract
- Floquet engineering uses time-periodic electromagnetic fields to modify the electronic properties of quantum materials via the creation of Floquet-Bloch states. These photon-dressed states inherit features from both the material and the driving field, enabling the exploration and control of quantum phenomena in light-matter hybrid systems. In non-centrosymmetric materials, shift currents can arise from the quantum geometric properties of electronic wavefunctions. However, shift currents from Floquet-Bloch states remain experimentally unexplored. Here, we employ an on-chip optoelectronic circuit to detect intrinsic terahertz emission from Floquet-Bloch states in Td-WTe2 under intense optical driving. We observe strong edge-localized terahertz emission that scales linearly with the driving field, consistent with the theoretical prediction for shift currents generated by Floquet-Bloch states. The results advance our understanding of strongly driven quantum materials and provide insights for developing efficient, bias-free terahertz sources for future optoelectronic technologies.
- Publisher
- Optical Society of America
- ISSN
- 2159-3930
- Appears in Collections:
- Department of Physics and Photon Science > 1. Journal Articles
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