邀请人：王亚娴   副研究员

联系人：周发然   副研究员（9677）

报告摘要：

The advent of artificial intelligence is generating a higher-than-ever demand of data transfer, processing and storage in the cloud. It has been proposed that spin waves or magnons, are promising information carriers for future THz information technology.

In this talk, I will focus on collective magnetic excitations (i.e. magnons). I will briefly discuss how these excitations can be coupled to charges at terahertz frequencies [1-2]. The main part of the talk will address the optical manipulation of magnons. I will show how the resonant excitation of specific magnetic and electronic transitions enables this goal. In particular magnon frequencies can be modified up to 40% of their original value at room temperature in a 20 nm thick magnet [3]. Alternatively, the resonant pumping of high-momentum magnons can be explored by means of mid-infrared laser pulses. This excitation pathway activates distinct zone-center modes whose amplitudes and frequencies are strongly renormalized compared to their equilibrium values [4]. I will conclude by outlining future perspectives of this research direction, with the long-term goal of achieving arbitrary optical control over magnon dispersion relations in quantum materials.

[1] T. Mezger et al. Phys. Rev. Lett. 135, 076702 (2025) - Cover and Editor's suggestion
[2] M. Cimander et al. Nat. Commun. 17, 1480 (2026)
[3] V. Wiechert et al. Nat. Commun. 17, 145 (2026)
[4] C. Schoenfeld et al. Sci. Adv. 11, 25 (2025)

报告人简介：

Dr. Davide Bossini received his PhD at the Radboud University Nijmegen (The Netherlands) in 2015. He spent then two years as a postdoctoral fellow in the University of Tokyo, supported by a JSPS (Japanese Society for the Promotion of Science) fellowship. He was then appointed as junior group leader at the TU Dortmund (Germany). After being awarded the prestigious Emmy Noether grant from the German Science Foundation (DFG), he moved to the University of Konstanz (Germany), where he set up his own group. Dr. Bossini’s work has been recognized by the IEEE Magnetics Society “Early Career Award” (2019) and the I-LAMP “Early Career Award” (2020).