Disorder-Induced Order in Two-Component Bose-Einstein Condensates

Armand Niederberger (1) , Thomas Schulte (1, 2) , Jan Wehr (1, 3) , Maciej Lewenstein (1, 4) , Laurent Sanchez-Palencia (5) , Krzysztof Sacha (1, 6)

1 ICFO - Institut de Ciencies Fotoniques [Castelldefels]
2 IQ - Institut für Quantenoptik [Hannover]
3 Department of Mathematics [University of Arizona]
4 ICREA - Institució Catalana de Recerca i Estudis Avançats = Catalan Institution for Research and Advanced Studies
5 laboratoire Charles Fabry de l'Institut d'Optique / Optique atomique
6 MSIP - Marian Smoluchowski Institute of Physics

We propose and analyze a general mechanism of disorder-induced order in two-component Bose-Einstein condensates, analogous to corresponding effects established for XY spin models. We show that a random Raman coupling induces a relative phase of π/2 between the two BECs and that the effect is robust. We demonstrate it in 1D, 2D and 3D at T=0 and present evidences that it persists for small T>0. Applications to phase control in ultracold spinor condensates are discussed.

Domaines: Autre [cond-mat.other]

Armand Niederberger, Thomas Schulte, Jan Wehr, Maciej Lewenstein, Laurent Sanchez-Palencia, et al.. Disorder-Induced Order in Two-Component Bose-Einstein Condensates. Physical Review Letters, 2008, 100, pp.030403. ⟨10.1103/PhysRevLett.100.030403⟩. ⟨hal-00160132⟩