Monday, September 17, 2012

1209.3244 (Aranya B. Bhattacherjee et al.)

Phonon Laser Effect and Dicke-Hepp-Lieb Superradiant Phase Transition in
Magnetic Cantilever Coupled to a Bose Einstein Condensate
   [PDF]

Aranya B. Bhattacherjee, Tobias Brandes
We propose a possibility of a phonon laser by coupling a Bose-Einstein condensate to a nanomechanical cantilever with a magnetic tip. Due to the magnetic coupling, atomic spin flips induce cantilever motion which can be used to produce a phonon laser. The system is described by the equivalent of the Jaynes-Cummings Hamiltonian. By controlling the number of atoms and the population inversion, one can obtain either a continuous wave (cw) or transient lasing. The two-body atom-atom interaction is also shown to coherently manipulate the lasing process. We also show that in the strong coupling limit, the same system can undergo a Dicke-Hepp-Lieb superradiant phase transition. Exotic phase diagrams can be obtained by tuning the two body atom-atom interaction.
View original: http://arxiv.org/abs/1209.3244

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