Congratulations to Dr. Le Thi Cam Tu and Co-authors on Publishing in a Nature Index Journal

The Institute for Advanced Study in Technology (IAST), Ton Duc Thang University, extends its warm congratulations to Dr. Le Thi Cam Tu and her co-authors on their latest international publication in Physical Review A. The journal is a prestigious publication of the American Physical Society (APS) and is included in the Nature Index, a selection of high-quality scientific journals curated by Nature Portfolio.

The Nature Index tracks the research output of countries and institutions. Since June 2026, it has been based on articles published in 177 journals and one conference proceedings across seven subject areas. These journals are selected by the scientific community itself, independently of publishers and without reliance on the Impact Factor, and are the venues where researchers aim to publish their most important work. The index covers only a small fraction of the world's scientific articles, and each publication counts directly toward the annual Research Leaders rankings of institutions and countries. According to Simon Baker, Chief Editor of the Nature Index, expanding the subject coverage and refining the methodology allow the index to reflect high-quality research worldwide more comprehensively and accurately.

The paper, titled "Moderate-terahertz-induced plateau expansion of high-order harmonic generation to the soft-x-ray region," investigates terahertz (THz)-assisted high-order harmonic generation (HHG), with the aim of extending the photon energy range of extreme-ultraviolet (EUV) and soft-x-ray sources. Using numerical simulations and analyses of electron dynamics, the authors elucidate the mechanism by which THz fields assist HHG. Their results show that even weak-to-moderate THz fields, readily accessible in laboratory settings, can significantly extend the HHG cutoff. This extension arises from long electron excursions before recombination, and the mechanism remains robust across a range of conditions. The findings highlight the potential of THz fields for controlling HHG and for developing high-energy radiation sources in the EUV and soft-x-ray regions.

This achievement once again demonstrates the research capacity and effective international collaboration of the scientists at the Institute for Advanced Study in Technology.

Congratulations to the research team! We wish the authors continued passion and many more successes in their research careers.