The angulon quasiparticle: from molecules in superfluids to ultrafast magnetism (Prof. M. Lemeshko)
11:30 - 13:00
Prof. Mikhail Lemeshko
IST Austria Klosterneuburg (Wien)
Max-Planck-Institut für Quantenoptik
Seminar room Theory Division - B 2.46
MPQ, Theory Division
Recently we have predicted a new quasiparticle - the angulon - which is formed when a quantum impurity (such as an electron, atom, or molecule) exchanges its orbital angular momentum with a many-particle environment (such as lattice phonons or a Fermi sea).
thereafter we obtained strong evidence that angulons are formed in experiments
on molecules trapped inside superfluid helium nanodroplets. The angulon
theory thereby provided a simple explanation for experimental data accumulated
during the last two decades. Moreover, casting the many-particle problem in
terms of angulons amounts to a drastic simplification and allows to tackle
previously intractable problems related to quantum dynamics.
presentation we will introduce the angulon concept and discuss novel physical
phenomena arising from the angular momentum exchange in quantum
many-particle systems. We will describe the applications of angulons to modern
experiments on quantum impurities and on non-equilibrium magnetism.