28
Jan
2025
14:30

Ofer Neufeld: "Research in the newly established ultrafast quantum dynamics theory group: Towards attosecond magnetism from first-principles"

28 Jan 2025
14:30
to
15:30
Weekly seminar
|
Solid State Auditorium

In this talk I’ll first introduce our newly established computational group at the Technion, and our goal of combining ab-initio and model simulations of quantum systems interacting with intense ultrashort laser pulses (driven far-from-equilibrium) to explore fundamental physics. This includes how electronic correlations evolve in their natural timescales (atto- to femtoseconds), the nature of light-dressed Floquet phases in intense fields, the role of electro-vibrational coupling in molecular charge migration, and more. I’ll discuss ongoing projects and research directions, as well as our main approach and vision. I’ll next focus on our recent work in a particular topic of interest – how to induce and measure the fastest known magnetization dynamics to date, having a timescale of just few hundreds of attoseconds. I’ll present predictions from ab-initio simulations showing that such fast magnetic responses exist, along with an analysis of the physical mechanism allowing them. I’ll then discuss our newly developed method – the first capable of generating attosecond duration intense magnetic pulses – which can be used to probe atto-magnetism. Lastly, I’ll present a new highly nonlinear magneto-optical phenomena that generates transient magnetism through linearly-polarized few-cycle pulse driving. I’ll show that the transient magnetic state can be coherently controlled via the carrier-envelope-phase, which acts as a knob for tuning light-induced time-reversal symmetry breaking.