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BEGIN:VEVENT
DTSTAMP:20230326T095712Z
UID:https://www.mpsd.mpg.de/events/6712/42300
DTSTART:20161004T090000Z
DTEND:20161004T100000Z
CLASS:PUBLIC
CREATED:20160927T124127Z
DESCRIPTION:Complex quantum many-body systems are ubiquitous in nature\, bu
t their behaviour often remains very challenging to predict with analytica
l or numerical calculations - especially when it comes to dynamics. Howeve
r\, using ultracold atoms in optical lattices it is possible to create pre
cisely tunable\, yet very accessible artificial solids\, which can be prob
ed with a large arsenal of observables. Using this experimental set-up\, w
e demonstrate how a periodically modulated lattice can be described by an
effective Floquet-Hamiltonian on longer time scales - even when driving th
e system far from equilibrium. This allows for implementing Haldane's mode
l for a topological insulator\, and mapping out its topological transition
s\, by applying an oscillating force to a honeycomb lattice. Using an osci
llating magnetic field gradient\, we also engineer spin-dependent bands. B
y adding interactions to the optical lattice system\, we create a pure rea
lisation of the Hubbard model and study how the distribution of anti-ferro
magnetic correlations therein depends on the geometry of the lattice. We i
nvestigate how fast correlations can re-arrange\, by deforming the lattice
geometry on time-scales ranging from the sudden to the adiabatic regime.
Finally\, we explore how an oscillating force applied to this interacting
system may be used to tune and enhance the magnetic exchange energy beyond
the regimes accessible within the Hubbard model.\, Vortragende(r): Gregor
Jotzu
LAST-MODIFIED:20160927T124127Z
LOCATION:CFEL (Bldg. 99)\, Raum: Seminar Room III\, EG.080
ORGANIZER:Andrea Cavalleri
SUMMARY:MPSD Seminar: Ultracold Fermions in Optical Lattices as a Testbed f
or Dynamically Driven Complex Materials
URL:https://www.mpsd.mpg.de/events/6712/42300
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