Información del autor
Autor Creffield, Charles E. |
Documentos disponibles escritos por este autor (46)
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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[...]![]()
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A two-level system subjected to a high-frequency driving field can exhibit an effect termed "coherent destruction of tunneling", in which the tunneling of the system is suppressed at certain values of the frequency and strength of the field. Thi[...]![]()
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We investigate the effect of electron-phonon interaction on the phononic properties in the onedimensional half-filled Holstein model of spinless fermions. By means of determinantal Quantum Monte Carlo simulation we show that the behavior of the [...]![]()
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We propose a scheme for producing directed motion in a lattice system by applying a periodic driving potential. By controlling the dynamics by means of the effect known as coherent destruction of tunneling, we demonstrate a novel ratchetlike eff[...]![]()
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Bayat, Abolfazl ; Creffield, Charles E. ; Jefferson, John H ; Pepper, Michael ; Bose, Sougato | IOP publishing ltd | 2015-10We show how single quantum dots, each hosting a singlet-triplet qubit, can be placed in arrays to build a spin quantum cellular automaton. A fast (? 10 ns) deterministic coherent singlet- triplet filtering, as opposed to current incoherent tunne[...]![]()
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Di Liberto, M. ; Creffield, Charles E. ; Japaridze, G. Y. ; Smith, C.Morais | American Physical Society | 2014-01-27By using a modulated magnetic field in a Feshbach resonance for ultracold fermionic atoms in optical lattices, we show that it is possible to engineer a class of models usually referred to as correlated-hopping models. These models differ from t[...]![]()
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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[...]![]()
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We study the dynamics of an Airy wave packet moving in a one-dimensional lattice potential. In contrast to the usual case of propagation in a continuum, for which such a wave packet experiences a uniform acceleration, the lattice bounds its velo[...]![]()
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Spectral weight function for the half-filled hubbard-model - a singular-value decomposition approach
Creffield, Charles E. ; Klepfish,, E.G. ; Pike, E. R. ; Sarkar, Sarben | American Physical Society | 1995-07-17The singular value decomposition technique is used to reconstruct the electronic spectral weight function for a half-filled Hubbard model with on-site repulsion U = 4t from quantum Monte Carlo data. A two-band structure for the single-particle e[...]![]()
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Creffield, Charles E. ; Klepfish, E. G. ; Pike, E. R. ; Sarkar, Sarben | American Physical Society | 1995-07-17The singular value decomposition technique is used to reconstruct the electronic spectral weight function for a half-filled Hubbard model with on-site repulsion U = 4t from quantum Monte Carlo data. A two-band structure for the single-particle e[...]![]()
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Garcia Coello, José ; Bayat, Abolfazl ; Bose, Sougato ; Jefferson, John H ; Creffield, Charles E. | American Physical Society | 2010-08-17We exploit the nondissipative dynamics of a pair of electrons in a large square quantum dot to perform singlet-triplet spin measurement through a single charge detection and show how this may be used for entanglement swapping and teleportation. [...]![]()
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We analyze the dynamics of two strongly interacting fermions moving in two-dimensional lattices under the action of a periodic electric field, both with and without a magnetic flux. Due to the interaction, these particles bind together forming a[...]![]()
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We examine the quantum dynamics of cold atoms subjected to pairs of closely spaced kicks from standing waves of light and find behavior quite unlike the well-studied quantum kicked rotor QKR. We show that the quantum phase space has a periodi[...]![]()
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The latest advances in the field of photonics have enabled the simulation of an increasing number of quantum models in photonic systems, turning them into an important tool for realizing exotic quantum phenomena. In this paper, different ways in[...]![]()
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We study the time-dependent dynamics of a Bose-Einstein condensate trapped in an optical lattice. Modeling the system as a Bose-Hubbard model, we show how applying a periodic driving field can induce coherent destruction of tunneling. In the low[...]