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Peer-reviewedCC BYScience Advances

Chirality-selective second-harmonic response with Floquet engineering

  • Yi Zhang1,2
  • Haijun Cao3,4
  • Youqiang Huang2
  • Luojun Du3,4
  • Nianze Shang2
  • Xueyin Bai2
  • Xuetao Gan1
  • Dong Mao1
  • Peng Li1
  • Jianlin Zhao1
  • F. Javier García de Abajo5,6
  • Sheng Meng3,4
1 more authors
  • Zhipei Sun2
6 affiliations
  1. 1Key Laboratory of Light Field Manipulation and Information Acquisition, Ministry of Industry and Information Technology, and Shaanxi Key Laboratory of Optical Information Technology, School of Physical Science and Technology, Northwestern Polytechnical University, Xi’an 710129, China.
  2. 2Department of Electronics and Nanoengineering, Aalto University, FI-00076 Aalto, Finland.
  3. 3Beijing National Laboratory for Condensed Matter Physics; Key Laboratory for Nanoscale Physics and Devices, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China.
  4. 4School of Physical Sciences, University of Chinese Academy of Sciences, Beijing 100190, China.
  5. 5ICFO–Institut de Ciencies Fotoniques, The Barcelona Institute of Science and Technology, 08860 Castelldefels (Barcelona), Spain.
  6. 6ICREA–Institució Catalana de Recerca i Estudis Avançats, 08010 Barcelona, Spain.
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Abstract

Symmetry breaking profoundly influences the macroscopic physical properties of materials. For instance, inversion symmetry breaking in monolayer transition metal dichalcogenides enables the emergence of chiral selection rules, featuring distinct optical chirality-selective electronic properties. Here, we demonstrate ultrafast, coherent manipulation of chirality-selective nonlinear optics in monolayer molybdenum disulfide (MoS₂) through time-reversal symmetry breaking via Floquet engineering. By using sub-bandgap, circularly polarized ultrafast optical pulses, we introduce nondegenerate, chirality-selective optical Stark and Bloch-Siegert shifts. This approach effectively lifts the energy degeneracy, leading to pronounced chirality-selective second-harmonic generation. Furthermore, we reveal that the Floquet-engineered chirality-selective states can be finely tuned using optical parameters such as intensity and chirality. Our results show a method for manipulating the energy degree of freedom, paving the way for ultrafast nonlinear photonics.

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Cite

BibTeXRIS
BibTeX
@article{zhang2026chiralityselective,
  title = {{Chirality-selective second-harmonic response with Floquet engineering}},
  author = {Yi Zhang and Haijun Cao and Youqiang Huang and Luojun Du and Nianze Shang and Xueyin Bai and Xuetao Gan and Dong Mao and Peng Li and Jianlin Zhao and F. Javier García de Abajo and Sheng Meng and Zhipei Sun},
  journal = {Science Advances},
  year = {2026},
  month = oct,
  doi = {10.1126/sciadv.aed6149},
  url = {https://www.science.org/doi/abs/10.1126/sciadv.aed6149},
  note = {CC BY},
}
RIS
TY  - JOUR
TI  - Chirality-selective second-harmonic response with Floquet engineering
AU  - Yi Zhang
AU  - Haijun Cao
AU  - Youqiang Huang
AU  - Luojun Du
AU  - Nianze Shang
AU  - Xueyin Bai
AU  - Xuetao Gan
AU  - Dong Mao
AU  - Peng Li
AU  - Jianlin Zhao
AU  - F. Javier García de Abajo
AU  - Sheng Meng
AU  - Zhipei Sun
PY  - 2026
DA  - 2026/10/30
JO  - Science Advances
DO  - 10.1126/sciadv.aed6149
UR  - https://www.science.org/doi/abs/10.1126/sciadv.aed6149
AB  - Symmetry breaking profoundly influences the macroscopic physical properties of materials. For instance, inversion symmetry breaking in monolayer transition metal dichalcogenides enables the emergence of chiral selection rules, featuring distinct optical chirality-selective electronic properties. Here, we demonstrate ultrafast, coherent manipulation of chirality-selective nonlinear optics in monolayer molybdenum disulfide (MoS₂) through time-reversal symmetry breaking via Floquet engineering. By using sub-bandgap, circularly polarized ultrafast optical pulses, we introduce nondegenerate, chirality-selective optical Stark and Bloch-Siegert shifts. This approach effectively lifts the energy degeneracy, leading to pronounced chirality-selective second-harmonic generation. Furthermore, we reveal that the Floquet-engineered chirality-selective states can be finely tuned using optical parameters such as intensity and chirality. Our results show a method for manipulating the energy degree of freedom, paving the way for ultrafast nonlinear photonics.
SN  - 2375-2548
ER  -