Orateur
Dr
Jeremy Armstrong
(Aarhus)
Description
We consider the N -body problem in a layered geometry containing cold polar molecules with
dipole moments that are polarized perpendicular to the layers. A harmonic approximation is
used to simplify the Hamiltonian and bound state properties of the two-body inter-layer dipolar
potential are used to adjust this effective interaction. To model the intra-layer repulsion of the
polar molecules, we introduce a repulsive inter-molecule potential that can be parametrically
varied. Single chains containing one molecule in each layer, as well as multi-chain structures
in many layers are discussed and their energies and radii determined. We extract the normal
modes of the various systems as measures of their volatility and eventually of instability, and
compare our findings to the excitations in crystals. We find modes that can be classified as either
chains vibrating in phase or as layers vibrating against each other. The former correspond to
acoustic and the latter to optical phonons. Instabilities can occur for large intra-layer repulsion
and produce diverging amplitudes of molecules in the outer layers.
Author
Dr
Jeremy Armstrong
(Aarhus)
Co-auteurs
Dr
A.G. Volosnev
(Aarhus)
Prof.
Aksel Jensen
(Aarhus)
Prof.
Dmitri Fedorov
(Aarhus)
Dr
N.T. Zinner
(Aarhus)
