Experimental realization of the Haldane model?

Not yet in graphene… but with cold atoms trapped in optical lattices!

Cold atoms condensed matter

cold atoms

photonics

start-up of cold atom physics...

cooling and trapping

controlling interactions

(one) basic idea (there are several!): exploit the Doppler effect

laser frequency

resonance frequency

n=1

n=2

Next step: load the cooled atoms into an optical lattice

counter-propagating laser beams

trapping potential from dipole force:the oscillating electric light field from a laser inducesan oscillating dipole moment in the atom while at the same time interacts with this dipole moment

Next step: load the cooled atoms into an optical lattice

counter-propagating laser beams

trapping potential from dipole force:the oscillating electric light field from a laser inducesan oscillating dipole moment in the atom while at the same time interacts with this dipole moment

the counterpropagating beams createa standing wave pattern which givesan extended periodic trapping potential,a ”crystal of light” with tight-binding atoms

Feshbach resonance:

Hermann Feshbach (1954)

Two famous cold-atom experiments probing quantum matter: