Coupling ultracold atoms to mechanical oscillators
  In this article we discuss and compare different ways to engineer an interface between ultracold atoms and micro- and nanomechanical oscillators. We start by analyzing a direct mechanical coupling of a single atom or ion to a mechanical oscillator and show that the very different masses of the two systems place a limit on the achievable coupling constant in this scheme. We then discuss several promising strategies for enhancing the coupling: collective enhancement by using a large number of atoms in an optical lattice in free space, coupling schemes based on high-finesse optical cavities, and coupling to atomic internal states. Throughout the manuscript we discuss both theoretical proposals and first experimental implementations. 
David Hunger, Stephan Camerer, Maria Korppi, Andreas J\"ockel, Theodor   W. H\"ansch, Philipp Treutlein
quant-ph cond-mat.quant-gas