Physics – Condensed Matter – Other Condensed Matter
Scientific paper
2008-05-30
Phys. Rev. A 78, 063622 (2008); Virtual Journal of Nanoscale Science & Technology, vol. 19, Issue 2 (2009)
Physics
Condensed Matter
Other Condensed Matter
Scientific paper
10.1103/PhysRevA.78.063622
We study the ground state phase diagram of ultracold dipolar gases in highly anisotropic traps. Starting from a one-dimensional geometry, by ramping down the transverse confinement along one direction, the gas reaches various planar distributions of dipoles. At large linear densities, when the dipolar gas exhibits a crystal-like phase, critical values of the transverse frequency exist below which the configuration exhibits novel transverse patterns. These critical values are found by means of a classical theory, and are in full agreement with classical Monte Carlo simulations. The study of the quantum system is performed numerically with Monte Carlo techniques and shows that the quantum fluctuations smoothen the transition and make it completely disappear in a gas phase. These predictions could be experimentally tested and would allow one to reveal the effect of zero-point motion on self-organized mesoscopic structures of matter waves, such as the transverse pattern of the zigzag chain.
Astrakharchik G. E.
Boronat Jordi
de Chiara Gabriele
Morigi Giovanna
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