Echo spectroscopy of bulk Bogoliubov excitations in trapped Bose-Einstein condensates
Abstract
We propose and demonstrate an echo method to reduce the inhomogeneous linewidth of Bogoliubov excitations, in a harmonically-trapped Bose-Einstein condensate. Our proposal includes the transfer of excitations with momentum +q to -q using a double two photon Bragg process, in which a substantial reduction of the inhomogeneous broadening is calculated. Furthermore, we predict an enhancement in the method’s efficiency for low momentum due to many-body effects. As a proof of principle, the echo can also be implemented by using a four photon process, as is demonstrated experimentally.
- Publication:
-
Physical Review A
- Pub Date:
- April 2004
- DOI:
- 10.1103/PhysRevA.69.041604
- arXiv:
- arXiv:cond-mat/0309584
- Bibcode:
- 2004PhRvA..69d1604G
- Keywords:
-
- 03.75.Kk;
- 03.75.Lm;
- 32.80.-t;
- Dynamic properties of condensates;
- collective and hydrodynamic excitations superfluid flow;
- Tunneling Josephson effect Bose-Einstein condensates in periodic potentials solitons vortices and topological excitations;
- Photon interactions with atoms;
- Condensed Matter
- E-Print:
- 4 pages, 5 figures