Echo spectroscopy of bulk Bogoliubov excitations in trapped Bose-Einstein condensates
E. Gershnabel, N. Katz, R. Ozeri, E. Rowen, J. Steinhauer, N. Davidson
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. The echo can also be implemented by using a four photon process, as is demonstrated experimentally.
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