Ion stopping in a dense quantum plasma using quantum kinetic theory

Stopping of ions is a sensitive diagnostic of dense plasmas. A theoretical description is difficult because it requires to take into account correlation and quantum effects as well as dynamical screening.

We use Nonequilibrium Green's functions (NEGF)[1] with the Generalized Kadanoff-Baym Ansatz[2] to simulate ion stopping in a uniform warm dense plasma. Correlation effects are taken into account via the selfenergy Σ and the non-Markovian structure of the equations of motion for the one-particle NEGF. Time-dependent single-particle observables are available through the one-particle NEGF, so we can directly compute the stopping power from it. We explore the performance of different selfenergy approximations, such as the statically screened Second Order Approximation and the dynamically screened GW approximation, and compare the results to experiments[3] and linear response results with highly accurate dielectric functions[4], and the Markov limit[5].

[1] M. Bonitz, Quantum Kinetic Theory (Springer, 2016)

[2] P. Lipavský, V. Špička, B. Velický, Phys. Rev. B34, 6933 (1986)

[3] A. B. Zylstra et al, Phys. Rev. Lett. 114, 215002 (2015)

[4] Zh. A. Moldabekov, T. Dornheim, M. Bonitz, T. S. Ramazanov, Phys. Rev. E101, 053203 (2020)

[5] D. O. Gericke, M. Schlanges, Phys. Rev. E60 904 (1999)