Seminars


Seminars

On an irregular basis various Special Seminars take place at the MPQ. The seminars are organized by scientists of our divisions, administration or staff representatives. The location will be announced with the event.
Host: MPQ, Theory Division, hosted by Dr. Richard Schmidt

An effective description of Ramsey tunnel-coupled 1D Bose gases with the Pokrovsky-Talapov model (Valentin Kasper)

An effective description of Ramsey tunnel-coupled 1D Bose gases with the Pokrovsky-Talapov model
The high flexibility of ultracold atoms allows for the design, control and thorough investigation of quantum matter. In this work we consider two one-dimensional Ramsey tunnel-coupled Bose gases and elaborate on its relation to the Prokrovsky-Talapov model. Further, we study the ground state with variational wave-functions and explore the experimental relevant finite system size effects. Finally, we discuss possible quench protocols in order to study the non-equilibrium evolution of the Pokrovsky-Talapov model and predict experimental relevant quantities such as the phase and the density. [more]

Quantum physics with compound atom-ion systems (Dr. Antonio Negretti)

Quantum physics with compound atom-ion systems
In this talk I shall illustrate how ultracold quantum systems of atoms and ions can be used for quantum simulation and information processing as well as for investigating many-body quantum physics. I shall thus present a few theoretical examples on how to control an atomic bosonic Josephson junction with a single trapped ion, the formation of molecular ions, and how to engineer long-ranged atom-ion interactions with laser fields and Rydberg excitations. [more]

Quantum anomaly and transport in the 2D Fermi gas

Quantum anomaly and transport in the 2D Fermi gas
A scale invariant system looks similar on different length scales. Usually this is realized only after some fine tuning, for instance near a phase transition or a scattering resonance. Remarkably, a classical gas in two dimensions is scale invariant for an arbitrary strength of contact interaction. This has striking consequences for its nonequilibrium scaling dynamics, in particular the breathing motion in a harmonic trapping potential. [more]
We consider two-dimensional weakly-bound heterospecies molecules formed in a Fermi-Bose mixture with attractive Fermi-Bose and repulsive Bose-Bose interactions. [more]
From quark and nuclear matter down to solid-state systems and ultracold gases, mass asymmetry is known to profoundly influence the behavior of strongly interacting mixtures of fermionic particles, both at the few- and many-body level. [more]
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