Laboratoire Kastler Brossel, ENS Paris
Cold atoms in FlatLand
Coherence and superfluidity are hallmark properties of
cold quantum matter. With the achievement of Bose-Einstein
condensation and fermionic degeneracy in atomic gases,
it is possible to study these phenomena in a novel clean
and well controlled environment.
The investigation of low dimension gases is of particular
interest in this context, since the phase transitions that
a system can undergo depends crucially on its dimensionality.
The talk will discuss recent experimental progresses in the
understanding of the specific properties of 2D atomic gases.
The key role played by quantized vortices will be emphasised,
and the link with Kosterlitz-Thouless physics will be discussed.
Z. Hadzibabic, P. Krüger, M. Cheneau, B. Battelier, and
J. Dalibard, Nature 441, 1118 (2006):
Berezinskii-Kosterlitz-Thouless crossover in a trapped atomic gas
P. Krüger, Z. Hadzibabic, J. Dalibard,
Phys. Rev. Lett. 99, 040402 (2007):
Critical Point of an Interacting Two-Dimensional Atomic Bose Gas