Información del autor
Autor Creffield, Charles E. |
Documentos disponibles escritos por este autor (46)
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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[...]![]()
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The Riemann hypothesis, which states that the nontrivial zeros of the Riemann zeta function all lie on a certain line in the complex plane, is one of the most important unresolved problems in mathematics. We propose here an approach to finding a[...]![]()
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Creffield, Charles E. ; Kornilovitch, P. E. ; Klepfish, E. G. ; Pike, E. R. ; Sarkar, Sarben | IOP Publishing Ltd. | 1997-05-05A Quantum Monte Carlo calculation of dynamical spin susceptibility in the half-filled 2D Hubbard model is presented for temperature T = 0.2t and an intermediate on-site repulsion U = 4t. Using the singular value decomposition technique we succee[...]![]()
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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[...]![]()
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He, Ran ; Ai, Ming-Zhong ; Cui, Jin-Ming ; Huang, Yun-Feng ; Han, Yong-Jian ; Li, Chuan-Feng ; Tu, Tao ; Creffield, Charles E. ; Sierra, G. ; Guo, Guang-Can | Amercican Physical Society | 2020-04-20The Riemann hypothesis, one of the most important open problems in pure mathematics, implies the most profound secret of prime numbers. One of the most interesting approaches to solving this hypothesis is to connect the problem with the spectrum[...]![]()
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We investigate the dynamics of a Bose-Einstein condensate held in an optical lattice under the influence of a strong periodic driving potential. Studying the mean-field version of the Bose- Hubbard model reveals that the condensate becomes dynam[...]![]()
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Creffield, Charles E. ; Háusler, Wolfgang ; Jefferson, John H ; Sarkar, Sarben | American Physical Society | 1999-04-15The low-lying eigenstates of a system of two electrons confined within a two-dimensional quantum dot with a hard polygonal boundary are obtained by means of exact diagonalization. The transition from a weakly correlated charge distribution for s[...]![]()
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The quantum dynamics of atoms subjected to pairs of closely spaced delta kicks from optical potentials are shown to be quite different from the well-known paradigm of quantum chaos, the single delta-kick system. We find the unitary matrix has a [...]![]()
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We investigate the dynamics of two interacting electrons moving in a one-dimensional array of quantum dots under the influence of an ac field. We show that the system exhibits two distinct regimes of behavior, depending on the ratio of the stre[...]![]()
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The calculation of the Floquet quasi-energies of a system driven by a time-periodic field is an efficient way to understand its dynamics. In particular, the phenomenon of dynamical localization can be related to the presence of close approaches [...]![]()
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The controlled transfer of particles from one site of a spatial lattice to another is essential for many tasks in quantum information processing and quantum communication. In this work we study how to induce long-range transfer between the two e[...]![]()
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Creffield, Charles E. ; Jefferson, John H ; Sarkar,, Sarben ; Tipton, D. L. J. | American Physical Society | 2000-09-15The low-energy eigenstates of two interacting electrons in a square quantum dot in a magnetic field are determined by numerical diagonalization. In the strong correlation regime, the low-energy eigenstates show Aharonov-Bohm-type oscillations, w[...]![]()
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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[...]![]()
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The two-dimensional (2D) vortex lattice in the extreme type-II limit is studied by Monte Carlo simulation of the corresponding 2D Coulomb gas, with identical pins placed at sites coinciding with the zero-temperature triangular vortex lattice. At[...]