CQD Special Seminar

10. January 2017 09:45

Seminarraum 3.402, Kirchhoff-Institut für Physik, INF 227

Universal features of quantum dynamics: catastrophes

Prof. Duncan O'Dell
McMaster University, Hamilton, ON, Canada

I will give an update of our work on catastrophes (caustics) that appear in the dynamics of two-mode fields such as a BEC in a double well, emphasizing scaling properties and taking the point of view that these structures constitute an example of universality in dynamics. Apart from plasmon dynamics, we will also consider catastrophes associated with pi-oscillations. Time permitting, I will also briefly introduce some other topics we are working on such as using a BEC to make a position measurement of an impurity atom, and my take on the Abraham-Minkowski controversy.

CQD Colloquium

29. Oktober 2025 16:30 Uhr

INF 226, K1-3 (Goldbox)

Exploring many-body physics with extended-range interactions

Dr Pascal Weckesser, Max Planck Institute of Quantum Optics

PreTalk: “Quantum droplets in Bose-Fermi mixtures”, Olivier Bleu, ITP, Heidelberg University

CQD Special Seminar

4. November 2025 14:15 Uhr

tba

Josephson supercurrents and vortex dynamics in binary Bose-Einstein condensates

Dr. Alice Bellettini, Department of Applied Science and Technology, Politecnico di Torino, Italy

Quantum bosonic gases, due to their manipulability, provide the perfect platform for observing macroscopic quantum many-body phenomena. These can be for example quantum vortices (“topological defects”), being the hallmark of superfluidity, or Josephson supercurrents. Such collective effects have been recently employed in the context of quantum simulation and atomtronics. Here, I will present my research on the properties of massive quantum vortices in different configurations, and on vortex-supported supercurrents.

I will go through the inertial effects governing the massive vortex dynamics, to then focus on dipole scattering processes and on Josephson supercurrents as well as self-trapping effects in two- and many-vortex systems. Finally, I will conclude with an overview of the open questions on the topic.

contact

Prof. Dr. M. Weidemüller
Physikalisches Institut
Im Neuenheimer Feld 226
69120 Heidelberg

06221-54 19470

Ferman Alkasari