correlated quantum systems
The research goal is to create a very accessible quantum system
for experimentally studying strongly correlated many-body states, such
as Mott insulator states, anti ferromagnetic states, exotic spin
phases, fermionic superfluids etc. This
can be achieved with ultracold atoms in multi-dimensional optical lattice
potentials. One specific focus of the work is the
development of a quantum gas
microscope - an evanescent wave optical trap system that allows
imaging of individual atoms with sub micron resolution. This device
will allow a new class of experiments, in which excellent spatial
addressability is essential. For more
information, please contact Markus Greiner.
apparatus is based on a magnetic transport method
that was pioneered by Greiner et al.
M. Greiner , I. Bloch, T. W. Hänsch and T. Esslinger:
Below you find a short description of this method
Magnetic transport of trapped cold atoms over a large distance
Phys. Rev. A 63, 031401 (2001)
ultracold atom apparatus
The new apparatus is based on a magnetic transport
scheme that provides a large cloud of cold atoms in a science chamber.
This description is for the apparatus built in Munich.
First, we capture a large number of atoms in a single vapor cell
magneto-optical trap (MOT).
Rubidium atoms in a magneto-optical trap (MOT) inside a vacuum chamber.
See a movie of the MOT (Munich apparatus):
- MOT video (divx
codec, 368 kB)
- MOT video (video for
windows codec, 752 kB, if it does not play try to save it first)
Then, the atoms are loaded into a magnetic quadrupole trap.
The magnetic trap is then moved over about half a meter along an
L-shaped path into a UHV chamber, and the quadrupole trap is converted
into an Ioffe-type trap (QUIC). In the final trap we apply evaporative
cooling until we get a nearly pure condensate of up to 106
The magnetic trap is smoothly moved by regulating the currents
in a chain of quadrupole coil pairs. The heating of the cloud during
the transport is negligible since the geometry of the trap does not
change during the transport.
The main advantage of this new scheme is the totally free
optical access to the BEC from all six directions since there is no MOT
at the final trapping site. This is an important precondition for the
3D lattice experiments.
... see also papers and review articles on publications