Probing Extreme High-Energy-Density Matter by High-Precision X-ray Spectroscopy

by Prof. Suxing Hu (Laboratory for Laser Energetics, University of Rochester, USA)

Thursday 22 Aug 2024, 16:00 → 17:00 Europe/Berlin

XHQ_E1.173 (EuXFEL Campus)

Extreme high-energy-density (HED) conditions of matter are often encountered in astrophysical objects like planets and stars, as well as inertial confinement fusion targets created in laboratories by powerful lasers. Accurate knowledge of extreme HED matter is essential for better understanding planetary science, astrophysics, and reliably designing fusion energy targets. Over the past decade, research has revealed that traditional plasma-physics models often fail to describe the physics of matter under extreme HED conditions, as strong coupling and electron degeneracy play a crucial role in such quantum many-body systems. Probing extreme HED matters in experiments mostly relies on measuring x-ray induced fluorescence and/or absorption to infer what happens inside extreme HED matter. On the theoretical/computational side, ab initio methods such as density functional theory (DFT) can provide a self-consistent picture of the underline physics. Combining both high-precision x-ray spectroscopy experiments and ab initio calculations, we have revealed some new HED physics phenomena over the past few years, which include the Fermi-surface rising in warm dense matter [1], interspecies radiative transition in super-dense matter [2], and a better understanding of implosion x-ray spectroscopy through DFT-based kinetic modeling [3]. In this seminar, I will cover what we have learned so far and what we are still struggling in exploring extreme HED matter.

[1] S. X. Hu, Phys. Rev. Lett. 119, 065001 (2017).

[2] S. X. Hu et al., Nat. Commun. 11, 1989 (2020).

[3] S. X. Hu et al., Nat. Commun. 13, 6780 (2022).

Zoom link:

https://xfel.zoom.us/j/95874131055?pwd=rEjdp7M2hhr4Exyy5x3KBgWC2xZeht.1

Meeting ID: 958 7413 1055
Passcode: 450026