Abstract
The development of powerful laser cooling and trapping techniques has made possible the controlled realization of dense and cold gaseous samples, thus opening the way for investigations in the ultracold temperature regimes not accessible with conventional techniques. A Bose-Einstein condensate (BEC) represents a peculiar gaseous state where all the particles reside in the same quantum mechanical state. Therefore BECs exhibit quantum mechanical phe-nomena on a macroscopic scale with a single quantum mechanical wavefunction describing the external degrees of freedom. That control of the external degrees of freedom is combined with a precise control of the internal degrees. The BEC investigation has become a very active area of research in contem-porary physics. The BEC study encompasses different subfields of physics, i.e., atomic and molecular physics, quantum optics, laser spectroscopy, solid state physics. Atomic physics and laser spectroscopy provide the methods for creating and manipulating the atomic and molecular BECs. However owing to the interactions between the particles composing the condensate and to the configuration of the external potential, concepts and methods from solid state physics are extensively used for BEC description.
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Arimondo, E., Ciampini, D., Morsch, O. (2010). Bose-Einstein Condensates in 1D Optical Lattices: Nonlinearity and Wannier-Stark Spectra. In: Denz, C., Flach, S., Kivshar, Y. (eds) Nonlinearities in Periodic Structures and Metamaterials. Springer Series in Optical Sciences, vol 150. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-02066-7_9
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