Giant Enhancement of Terahertz High-Harmonic Generation by Cavity Engineering of a Three-Dimensional Dirac Semimetal.

Authors

Siyu Duan, Lili Shi, Patrick Pilch, Anneke Reinold, Sergey Kovalev, Renato M A Dantas, Yunkun Yang, Faxian Xiu, Miriam Serena Vitiello, Zhe Wang

Published in

Nano letters. Volume 26. Issue 31. Pages 10554-10560. Aug 12, 2026.

Abstract

We report on time-resolved ultrafast terahertz high-harmonic generation of strong field-driven dynamics of many-body Dirac fermions. We demonstrate an experimental realization of near-saturation regime of the high-order nonlinear responses with a giant enhancement of terahertz third- and fifth-order harmonic yields by cavity-engineering a three-dimensional Dirac semimetal, Cd3As2. By fabricating a designed structure of metasurface microcavities on a nanometer Cd3As2 thin film, we significantly enhance the near-field intensity of a picosecond terahertz excitation pulse in resonance with the microcavity eigenmode. The strong terahertz field drives the far-from-equilibrium Dirac fermions deeply into a nonperturbative regime, leading to the observation of near-saturation high-harmonic emission. Our experimental results confirm the predictions by Boltzmann transport theory and substantiate a field-driven kinetic description of the strong nonthermal nonlinearity at terahertz frequencies.

PMID:
42584272
Bibliographic data and abstract were imported from PubMed on 12 Aug 2026.

Read full publication at:
Please sign in to see all details.

Stats

1-terrible, 9-excellent. How would you rate this publication? Sign in in to submit your rating.

Post a comment

You need to be signed in to post comments. You can sign in here.

Comments

There are no comments yet.