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8. June 2017 11:00

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.