Nonclassical dynamics of Bose condensates in an optical lattice in the superfluid regime - Condensed Matter > Mesoscale and Nanoscale PhysicsReport as inadecuate




Nonclassical dynamics of Bose condensates in an optical lattice in the superfluid regime - Condensed Matter > Mesoscale and Nanoscale Physics - Download this document for free, or read online. Document in PDF available to download.

Abstract: A condensate in an optical lattice, prepared in the ground state of thesuperfluid regime, is stimulated first by suddenly increasing the opticallattice amplitude and then, after a waiting time, by abruptly decreasing thisamplitude to its initial value. Thus the system is first taken to the Mottregime and then back to the initial superfluid regime. We show that, as aconsequence of this nonadiabatic process, the system falls into a configurationfar from equilibrium whose superfluid order parameter is described in terms ofa particular superposition of Glauber coherent states that we derive. We alsoshow that the classical equations of motion describing the time evolution ofthis system are inequivalent to the standard discrete nonlinear Schreodingerequations. By numerically integrating such equations with several initialconditions, we show that the system loses coherence, becoming insulating.



Author: Roberto Franzosi Dipartimento di fisica Universita' di Firenze and CNR-INFM

Source: https://arxiv.org/



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