Time-of-flight roton spectroscopy in dipolar Bose-Einstein condensates
Abstract
Dipolar Bose-Einstein condensates may present a rotonlike dispersion minimum, which has yet to be observed in experiments. We discuss a simple method to reveal roton excitations based on the response of quasi-two-dimensional dipolar condensates against a weak lattice potential. By employing numerical simulations for realistic scenarios, we analyze the response of the system as a function of both the lattice spacing and the s-wave scattering length, showing that the roton minimum may be readily revealed in current experiments by the resonant population of Bragg peaks in time-of-flight measurements.
- Publication:
-
Physical Review A
- Pub Date:
- August 2013
- DOI:
- 10.1103/PhysRevA.88.025603
- arXiv:
- arXiv:1307.6004
- Bibcode:
- 2013PhRvA..88b5603J
- Keywords:
-
- 03.75.Kk;
- 05.30.Jp;
- 67.85.-d;
- Dynamic properties of condensates;
- collective and hydrodynamic excitations superfluid flow;
- Boson systems;
- Ultracold gases trapped gases;
- Condensed Matter - Quantum Gases
- E-Print:
- 5 pages, 5 figures