Prof. Dr. M. Weidemüller
Physikalisches Institut
Im Neuenheimer Feld 226
69120 Heidelberg
Claudia Krämer
25.10.2017 17:00 / 17:30
Prof. Eugene S. Polzik, Niels Bohr Institute, University of Copenhagen, Kirchhoff-Institut, INF 227 SR 1.403

CQD special colloquium


8. June 2017 11:00

Konferenzraum 4, 01.106, Physikalisches Institut, INF 226

An impurity in a quantum gas: Ground state and time dynamics

Dr. Artem G. Volosniev
TU Darmstadt

One path to understand the interplay of one- and many-body physics is to study a system
with an impurity. Here we follow it using two one-dimensional models: a weakly-interacting
Bose gas with an impurity, and a Fermi gas with a strongly-interacting impurity. For the
former we present a simple analytical approach that captures the ground state features. The
latter also admits analytical treatment as it can be mapped on the Heisenberg spin chain.
For the Bose gas we calculate properties in the thermodynamic limit, and the approach
to this limit. In the Fermi gas case we focus on small trapped systems and examine the
corresponding Heisenberg spin chain. These results lay the foundation for our future studies:
1) three-dimensional Bose polaron in cold atoms and nuclear physics,
2) formation and time dynamics of polaron quasiparticles.