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Startpage > News > Calendar of Events > Excitations in 2D Dipolar gases

Veranstaltungskalender

Excitations in 2D Dipolar gases

Gastvortrag, 06.11.12

Kurzbeschreibung

We present a first principle treatment of the dynamic structure factor and the spectral density of single-particle excitations for weakly and strongly interacting 2D dipolar systems. The systems of ultracold dysprosium (erbium), polar molecules and indirect excitons are good candidates for experimental validations of our analyses.

Using the path integral Monte Carlo technique in the grand canonical ensemble we evaluated the imaginary-time density response and the one-particle Matsubara Green's function. The stochastic optimization method was used to accurately reconstruct the excitation spectrum. This approach allows one to analyze in detail the temperature-density dependence of the phonon-maxon-roton dispersion, its broadening (damping) and hybridization due to quasiparticle decay processes. In particular, we found that the two-roton state (Pitaevskii "plateau") exists independently of the presence of a condensate and, therefore, conclude that the roton mode has a classical origin due to short-range particle correlations. Its observation in classical liquids is, probably, prevented by the softening and overdamping.

Weitere Informationen

www.iqo.uni-hannover.de

Referent/innen

Dr. Alexey Filinov, Christian-Albrechts-Universit√§t zu Kiel, Institut f√ľr Theoretische Physik und Astrophysik

Veranstalter

Institut f√ľr Quantenoptik

Termin

Dienstag, 06. November 2012, 10:00 bis 11:00 Uhr

Ort

Hauptgeb√§ude (Geb√§ude 1101, Seminarraum D 326, Institut f√ľr Quantenoptik)
Welfengarten 1, 30167 Hannover

Ein Verschieben des Kartenausschnitts ist mit gedrückter Maustaste möglich.

Die Karte wurde uns freundlicherweise von Herrn Dr. Tobias Dahinden, Institut für Kartographie und Geoinformatik zur Verfügung gestellt.


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