Berlin 2014 – scientific programme
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A: Fachverband Atomphysik
A 8: Ultra-cold atoms, ions and BEC II (with Q)
A 8.4: Talk
Monday, March 17, 2014, 14:45–15:00, BEBEL E34
Collective modes in dipolar bosonic bilayers — •Alexey Filinov1,2 and Michael Bonitz1 — 1Institut für Theoretische Physik und Astrophysik, D-24098 Kiel, Germany — 2Joint Institute for High Tem- peratures RAS, 125412 Moscow, Russia
Using quantum Monte Carlo method [1] we analyze collective excitations (dynamic structure factor S(q,ω)) in a two-component bosonic system in the bilayer geometry. Dipolar bosons from two layers can differ in their mass, effective scattering length and value of the dipole moment oriented perpendicular to the plane of motion. Motion in the transverse direction is controlled by a confining potential provided by an optical lattice. This leads to a system of two coupled quasi-two dimensional layers dominated either by the intra- or inter-layer interactions.
The dispersion law for the out-of-phase and in-phase collective modes during a crossover from weakly to strongly bound inter-layer dimers is studied in detail and compared with the predictions based on the sum rules formalism [2]
[1] A. Filinov and M. Bonitz, Phys. Rev. A 86, 043628 (2012); [2] K.I. Golden, G.J. Kalman, Phys. Rev. E 88, 033107 (2013).