ELFT HÍRADÓ

[Janos Asboth <asboth.janos AT wigner.mta.hu>]

Tisztelt Kollégák,

Szeptember 5-én, kedden 14 órakor ismét

*Wigner Kollokvium*

az MTA Wigner FK SZFI  Tanácstermében.

*Hans-Jörg Kull* (Institute for Theory of Statistical Physics, RWTH Aachen
University):
*Quantum-plasma dynamics*

Nonequilibrium dynamics of plasmas often requires a kinetic treatment, in
particular, on femtosecond time-scales of present short pulse laser-plasma
experiments. The collisionless regime is basically described by the
Vlasov-Maxwell theory describing the long-range Coulomb interaction between
particles by a self-consistent potential. In the present talk, we review
the Vlasov approach in quantum mechanics and introduce a formulation, the
multistream model, that is particularly well adopted to numerical quantum
plasma simulations [1-3]. Furthermore, the role of the quantum-mechanical
exchange interaction will be discussed in the framework of the Hartree-Fock
theory. Using these methods, we consider small amplitude plasma waves and
Landau damping in a Fermi-degenerate state, nonlinear wavebreaking of large
amplitude waves, as well as applications to atomic clusters in strong laser
fields. As prominent results, subexponential relaxation of plasma waves is
found in certain regimes of a fully Fermi-degenerate quantum plasma and the
relaxation of  Mie-plasmons due to surface-scattering effects can be
calculated quantitatively for small spherical metal clusters.

[1] A. Schmidt-Bleker, W. Gassen, and H.-J. Kull, EPL 95, 55003  (2011)
[2] W. Steffen and H.-J. Kull, Phys. Rev. E 93, 033207 (2016)
[3] A. El-Khawaldeh and H.-J. Kull, Phys. Rev. A 95, 043401 (2017)


5th September, 2pm
KFKI Campus, Building 1, Meeting Room

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(a szervezők, Varró Sándor és Bíró Tamás nevében): Asbóth János