Dresden 2011 – wissenschaftliches Programm

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Q: Fachverband Quantenoptik und Photonik

Q 57: Poster 3: Quantengase, Ultrakalte Atome, Ultrakalte Moleküle, Materiewellen Optik, Präzisionsmessungen, Metrologie

Q 57.20: Poster

Donnerstag, 17. März 2011, 16:30–19:30, P1

Interacting instabilities in spin-orbit coupled one dimensional Spinor condensates — •Frank Zimmer, Andreas Jacob, and Rejish Nath — Max-Planck-Institut für Physik komplexer Systeme, Nöthnitzer Str. 38, 01187 Dresden

Homogeneous Bose Einstein condensates with repulsive short-range interactions are always stable against small perturbations. Once spin-orbit (SO) coupling is introduced they exhibit a finite momentum instability. Such an instability may lead to the formation of standing waves in 1D or vortex arrays in 2D, depending on the interactions in the system.

If interactions are attractive, in addition to the already existing unstable finite momentum modes, unstable low momentum phonon excitations occur. They emerge due to the SO coupling present in the system. Such a novel scenario in BECs is studied by means of Landau modulation equations. We discuss in detail the possible stable solutions associated with interacting instabilities.