The angulon quasiparticle: from molecules in superfluids to ultrafast magnetism (Prof. M. Lemeshko)

  • Date: Jul 11, 2018
  • Time: 11:30 AM - 01:00 PM (Local Time Germany)
  • Speaker: Prof. Mikhail Lemeshko
  • IST Austria Klosterneuburg (Wien)
  • Location: Max-Planck-Institut für Quantenoptik
  • Room: Seminar room Theory Division - B 2.46
  • Host: 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).

Soon 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.

In this 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.

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