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Muñoz de Nova, Juan Ramón ; Guéry Odelin, D. ; Sols Lucía, Fernando ; Zapata, I. | IOP Publishing | 2014-12-15We study the evolution of an initially confined atom condensate, which is progressively outcoupled by gradually lowering the confining barrier on one side. The goal is to identify protocols that best lead to a quasi-stationary sonic black hole s[...]texto impreso
We study the response of a Bose-Einstein condensate to an unbiased periodic driving potential. By controlling the space and time symmetries of the driving we show how a directed current can be induced, producing a coherent quantum ratchet. Weak [...]texto impreso
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We study the effect of a strong, oscillating driving field on the dynamics of ultracold boson held in an optical lattice. Modeling the system as a Bose-Hubbard model, we show how the driving field can be used to produce and maintain a coherent a[...]texto impreso
We examine the dynamics of ultracold atoms held in optical-lattice potentials. By controlling the switching of a periodic driving potential we show how a phase-induced renormalization of the intersite tunneling can be used to produce directed mo[...]texto impreso
Heimsoth, Martin ; Hochstuhl, D. ; Creffield, Charles E. ; Carr, L.D. ; Sols Lucía, Fernando | IOP Publishing | 2013-10-07We show that the orbital Josephson effect appears in a wide range of driven atomic Bose-Einstein condensed systems, including quantum ratchets, double wells and box potentials. We use three separate numerical methods: the Gross-Pitaevskii equati[...]texto impreso
We consider a sonic black-hole scenario where an atom condensate flows through a subsonic–supersonic interface. We discuss several criteria that reveal the existence of non-classical correlations resulting from the quantum character of the spont[...]texto impreso
Creffield, Charles E. ; Sols Lucía, Fernando ; Ciampini, D. ; Morsch, O. ; Arimondo, E. | American Physical Society | 2014-01-27We study the nonequilibrium dynamics of cold atoms held in an optical lattice subjected to a periodic driving potential. The expansion of an initially confined atom cloud occurs in two phases: an initial quadratic expansion followed by a ballist[...]texto impreso
Gaul, C. ; Domínguez-Adame Acosta, Francisco ; Sols Lucía, Fernando ; Zapata, I. | American Physical Society | 2014-01-21Two-particle scattering in graphene is a multichannel problem, where the energies of the identical or opposite-helicity channels lie in disjoint energy segments. Due to the absence of Galilean invariance, these segments depend on the total momen[...]texto impreso
We describe a method to generate a synthetic gauge potential for ultracold atoms held in an optical lattice. Our approach uses a time-periodic driving potential based on quickly alternating two Hamiltonians to engineer the appropriate Aharonov-B[...]texto impreso
Valdez, Mark Andrew ; Shchedrin, Gavriil ; Sols Lucía, Fernando ; Carr, Lincoln D. | American Physical Society | 2019-06-17We investigate the dimension of the phase-space attractor of a quantum chaoticmany-body ratchet in the mean-field limit. Specifically, we explore a driven Bose-Einstein condensate in three distinct dynamical regimes-Rabi oscillations, chaos, and[...]texto impreso
Valdez, Marc Andrew ; Shchedrin, Gavriil ; Heimsoth, Martin ; Creffield, Charles E. ; Sols Lucía, Fernando ; Carr, Lincoln D. | American Physical Society | 2018-06-05We uncover signatures of quantum chaos in the many-body dynamics of a Bose-Einstein condensate-based quantum ratchet in a toroidal trap. We propose measures including entanglement, condensate depletion, and spreading over a fixed basis in many-b[...]texto impreso
Sols Lucía, Fernando ; Heimsoth, M. ; Creffield, Charles E. ; Carr, L.D. | IOP publishing ltd | 2012-07-26In a system of ac-driven condensed bosons we study a new type of Josephson effect occurring between states sharing the same region of space and the same internal atom structure. We first develop a technique to calculate the long-time dynamics of[...]texto impreso
Creffield, Charles E. ; Pieplow, G. ; Sols Lucía, Fernando ; Goldman, N. | IOP Publishing | 2016-09-06Shaking a lattice system, by modulating the location of its sites periodically in time, is a powerful method to create effective magnetic fields in engineered quantum systems, such as cold gases trapped in optical lattices. However, such schemes[...]
