Conference on quantum impurities at IST Austria

This summer we are organizing a workshop "Controllable Quantum Impurities in Physics and Chemistry" (CoQIPC 2017), together with the Institute of Theoretical Atomic, Molecular, and Optical Physics (ITAMP, Harvard University).

The workshop will take place August 16–18 at IST Austria (near Vienna).

We aim to bring together people working on quantum impurities in ultracold gases, solid state systems, helium nanodroplets, and beyond.

Hurry up, the registration is open until July 1:

If you have any questions, just drop a message to Misha Lemeshko

New paper with experimentalists published

B. Shepperson,  A. S. Chatterley, A. A. Søndergaard, L. Christiansen, M. Lemeshko, H. Stapelfeldt
Strongly aligned molecules inside helium droplets in the near-adiabatic regime,
J. Chem. Phys. 147, 013946 (2017)arXiv:1704.03684

Coherent rotation of angulons observed in experiment

The angulon theory was able to describe non-adiabatic dynamics of iodine molecules in superfluid helium nanodroplets, as observed in experiments of Henrik Stapelfeldt:

B. Shepperson, A. A. Søndergaard, L. Christiansen, J. Kaczmarczyk, R. E. Zillich, M. Lemeshko,
H. Stapelfeldt
Laser-induced rotation of iodine molecules in He-nanodroplets: revivals and breaking-free,
Phys. Rev. Lett. 118, 203203 (2017)

Interestingly, the revival of alignment observed experimentally can be explained as a rotational revival of the angulon quasiparticle.

The theory was developed by Dr. Jan Kaczmarczyk, a postdoctoral fellow in our group.

A piece on angulons in Physics World

Meet the 'angulon', a new quasiparticle found in superfluid helium

by Edwin Cartlidge

"The quasiparticle concept allows physicists to describe complex, many-body interactions in terms of the behaviour of a single particle-like entity. Usually these particles turn up in condensed-matter systems such as semiconductors, but a new type of quasiparticle known as an angulon has been proposed to describe the rotation of an atomic or molecular impurity within a solvent. First proposed theoretically two years ago, angulons have now been shown to explain the curious behaviour of a range of different molecules rotating within liquid helium. ..."


See other press releases on angulons:, ScienceDaily, EurekAlert, Space Daily (in English),
der Standard, Austria Presse Agentur (in German) (in Spanish), Echo Moskvy (in Russian) (in Turkish) (in Czech)
Physics Bimonthly Taiwan (in Chinese)