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A: Fachverband Atomphysik

A 8: Ultra-cold atoms, ions and BEC II (with Q)

A 8.4: Vortrag

Montag, 17. März 2014, 14:45–15:00, BEBEL E34

Collective modes in dipolar bosonic bilayers — •Alexey Filinov^1,2 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).