Year: 2013
Type: article
Abstract: We study zero sound in a weakly interacting two-dimensional (2D) gas of single-component fermionic dipoles (polar molecules or atoms with a large magnetic moment) tilted with respect to the plane of their translational motion. It is shown that the propagation of zero sound is provided by both mean-field and many-body (beyond mean field) effects, and the anisotropy of the sound velocity is the same as the one of the Fermi velocity. The damping of zero sound modes can be much slower than that of quasiparticle excitations of the same energy. One thus has wide possibilities for the observation of zero sound modes in experiments with 2D fermionic dipoles, although the zero sound peak in the structure function is very close to the particle-hole continuum.
Source: Physical Review A
Institutions: Max Planck Society, Max Planck Institute of Quantum Optics, Université Paris-Sud, Centre National de la Recherche Scientifique, Landau Institute for Theoretical Physics, Laboratoire de Physique Théorique et Modèles Statistiques, University of California, Santa Barbara, Van der Waals-Zeeman Institute, Kavli Institute for Theoretical Physics, University of Amsterdam
Language: English
Subfield: Atomic and Molecular Physics, and Optics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: bronze
Awards: G258938352, G6771358743
OpenAlex ID: W2027965845