Nonclassical dynamics of Bose condensates in an optical lattice in the superfluid regime - Condensed Matter > Mesoscale and Nanoscale PhysicsReportar como inadecuado




Nonclassical dynamics of Bose condensates in an optical lattice in the superfluid regime - Condensed Matter > Mesoscale and Nanoscale Physics - Descarga este documento en PDF. Documentación en PDF para descargar gratis. Disponible también para leer online.

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.



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

Fuente: https://arxiv.org/







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