Sala DSF 12:15 
Seminarium Instytutu

dr Zhandos Moldabekov (CASUS, Görlitz)

The Physics of Inhomogeneous Warm Dense Matter

Warm dense matter (WDM) is an interdisciplinary field between plasma physics, condensed matter physics, high pressure science, inertial confinement fusion, planetary science, and materials science under extreme conditions [1-3]. Therefore, WDM is a complex regime to which neither ordinary condensed matter theory nor plasma theory are applicable. Due to relatively well developed theoretical and computational methods for homogeneous states, most of the initial studies were focused on uniform WDM. However, recent introduction of THz lasers [4], the novel seeding technique to reach high intensities [5], and laser pumping of a sample with a predesigned periodic grating structure [6] allows us to generate inhomogeneous states. Therefore, in this talk the results will be presented for collective oscillations in inhomogeneous WDM. Additionally, the non-linear density response of electrons and applicability of various exchange-correlation functionals such as LDA, GGA, and meta-GGA will be discussed. The analysis of the quality of the KS-DFT approach based on different exchange-correlations functionals is performed by comparing to QMC data. Finally, the quantum fluid theory of inhomogeneous quantum electrons will be presented. The results on the first ab inito study of the many-fermion Bohm field will be shown. The latter has impact going well beyond WDM, since it is key quantity of Bohmian quantum mechanics.
[1] A. Ng, IEEE International Conference on Plasma Science (Cat. No.02CH37340), 2002, pp. 163-, doi: 10.1109/PLASMA.2002.1030367
[2] F. Graziani, M. P. Desjarlais, R. Redmer, and S. B. Trickey, Frontiers and Challenges in Warm Dense Matter (Springer, 2014)
[3] V. E. Fortov,Extreme States of Matter (Springer, Heidelberg, 2016)
[4] B.K. Ofori-Okai, et al., J. Inst13, P06014 (2018)
[5] T Kluge, et al., Phys. Rev. X 8, 031068 (2018)