M. Jona-Lasinio, K. Łakomy, L. Santos
Dipolar Bose-Einstein condensates may present a rotonlike dispersion minimum, which is yet to be observed in experiments. We discuss a simple method to reveal roton excitations, based on the response of quasi-2D 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.
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http://arxiv.org/abs/1307.6004
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