We are always interested in prospective PhD students as well as postdocs. Also, students are encouraged to
apply for semester/bachelor/master projects at any time. For information or application, please contact
Tilman Esslinger and/or Tobias Donner.
Engineering Strongly-Correlated Magnetic Systems with Long-Range Interactions
In our experiment, we couple a Bose-Einstein condensate (BEC) to an ultrahigh-
finesse optical resonator to study cavity QED in many-body quantum systems.
In the dispersive regime, we engineer long-range interactions by photon
scattering from external drives. At a critical driving strength, the system
undergoes a Dicke phase transition to a superradiant crystal. The inherent loss
from the cavity mirrors provides non-destructive, real-time access to the
dynamics and, at the same time, introduces dissipative coupling channels.
In recent projects, we have selectively addressed the internal atomic spin and
investigated novel phases and dynamics arising from the interplay between
coherent and dissipative couplings. We discovered chiral instabilities and limit-
cycles in a spinor BEC coupled to two different atomic
spatial configurations by exploiting a dissipative coupling
between the light quadrature mediating these modes .
Moreover, we observed an emergent dissipation-
stabilized dark phase by tuning the competition between coherent and dissipative
processes in a Raman-coupled BEC. We uncovered the microscopic mechanism by
probing the properties of the underlying light-matter excitations .
In a very
recent experiment, we engineered dynamical tunneling in a two-dimensional
synthetic lattice momentum space. The emerging currents are mediated by a
state-dependent photon field and can be locally resolved via the leaking cavity field .
Starting point for future projects is to investigate emergent magnetic phenomena in strongly-correlated
systems featuring cavity-assisted long-range interactions. This regime can be accessed by enhancing on-
site interactions in a three-dimensional optical lattice . Besides the prospect of discovering
unconventional magnetic phases, such systems hold the potential to realize dynamical gauge fields and
advance the simulation of lattice gauge theories. A strong background in experimental quantum gas
physics and theoretical many-body physics is desirable, and you should enjoy working in a small team
with 2-3 PhD students. Starting time of the PostDoc is at your earliest convenience.
 Dogra, N., Landini, M., Kroeger, K., Hruby, L., Donner, T., Esslinger, T. (2019). Science, 366(6472), 1496-1499.
 Ferri, F., Rosa-Medina, R., Finger, F., Dogra, N., Soriente, M., Zilberberg, O., Donner, T., Esslinger, T. (2021). arXiv:2104.12782.
 Rosa-Medina, R., Ferri, F., Finger, F., Dogra, N., Kroeger, K., Lin, R., Chitra, R., Donner, T., Esslinger, T. (2021). In preparation
 Landig, R., Hruby, L., Dogra, N., Landini, M., Mottl, R., Donner, T., & Esslinger, T. (2016). Nature, 532(7600), 476-479.
Prof. Tilman Esslinger
ETH Zurich, Otto-Stern-Weg 1, CH-8093 Zürich