Zobrazeno 1 - 10
of 208
pro vyhledávání: '"Frantzeskakis DJ"'
We study the existence and stability of bright, dark, and gap matter-wave solitons in optical superlattices. Then, using these properties, we show that (time-dependent) “dynamical superlattices” can be used to controllably place, guide, and manip
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=od______2127::726ad993540a35c725baf23256910d6e
https://pergamos.lib.uoa.gr/uoa/dl/object/uoadl:3099095
https://pergamos.lib.uoa.gr/uoa/dl/object/uoadl:3099095
We consider the effects of anisotropy on solitons of various types in two-dimensional nonlinear lattices, using the discrete nonlinear Schrodinger equation as a paradigm model. For fundamental solitons, we develop a variational approximation that pre
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=od______2127::3e0e72e9859e02cd51c5581df69ed3e4
https://pergamos.lib.uoa.gr/uoa/dl/object/uoadl:3097510
https://pergamos.lib.uoa.gr/uoa/dl/object/uoadl:3097510
We study the instability of the discrete vortex with topological charge S=2 in a prototypical lattice model and observe its mediation through the central lattice site. Motivated by this finding, we analyze the model with the central site being inert.
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=od______2127::f3f07222e61a8e65bb717c6b8926baab
https://pergamos.lib.uoa.gr/uoa/dl/object/uoadl:3096888
https://pergamos.lib.uoa.gr/uoa/dl/object/uoadl:3096888
We present a framework for studying vortex lattice patterns and their structural transitions, using the Parrinello-Rahman (PR) method for molecular-dynamics (MD) simulations. Assuming an interaction between vortices derived from a Ginzburg-Landau fie
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=od______2127::0ce3f190400900c032b78d183336469d
https://pergamos.lib.uoa.gr/uoa/dl/object/uoadl:3094303
https://pergamos.lib.uoa.gr/uoa/dl/object/uoadl:3094303
We report the first observation of stationary necklace-like solitons. Such necklace structures were realized when a high-order vortex beam was launched appropriately into a two-dimensional optically induced photonic lattice. Our theoretical results o
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=od______2127::a921afaeb2a64aa6a4fc78e0dc9d2fba
https://pergamos.lib.uoa.gr/uoa/dl/object/uoadl:3093644
https://pergamos.lib.uoa.gr/uoa/dl/object/uoadl:3093644
We analyze the dynamics of dark matter-wave solitons on a Thomas-Fermi cloud described by the Gross-Pitaevskii equation with radial symmetry. One-dimensional, ring, and spherical dark solitons are considered, and the evolution of their amplitudes, ve
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=od______2127::674aa6ad5911a808792bc0a574bdb3c9
https://pergamos.lib.uoa.gr/uoa/dl/object/uoadl:3097092
https://pergamos.lib.uoa.gr/uoa/dl/object/uoadl:3097092
We examine the dynamics of a bright solitary wave in the presence of a repulsive or attractive localized “impurity” in Bose-Einstein condensates (BECs). We study the generation and stability of a pair of steady states in the vicinity of the impur
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=od______2127::d5b9119581decede2a0cacf41b36400a
https://pergamos.lib.uoa.gr/uoa/dl/object/uoadl:3097379
https://pergamos.lib.uoa.gr/uoa/dl/object/uoadl:3097379
We investigate the dynamics of matter-wave solitons in the presence of a spatially varying atomic scattering length and nonlinearity. The dynamics of bright and dark solitary waves is studied using the corresponding Gross-Pitaevskii equation. The num
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=od______2127::bcff22d9a3f13b3a488240b574048d90
https://pergamos.lib.uoa.gr/uoa/dl/object/uoadl:3097292
https://pergamos.lib.uoa.gr/uoa/dl/object/uoadl:3097292
Motivated by the recent experimental achievements in the work with Bose-Einstein condensates (BECs), we consider bright matter-wave solitons, in the presence of a parabolic magnetic trap and a spatially periodic optical lattice (OL), in the attractiv
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=od______2127::c3c83a0f2a2d95e9e75ea895898f7cbb
https://pergamos.lib.uoa.gr/uoa/dl/object/uoadl:3093370
https://pergamos.lib.uoa.gr/uoa/dl/object/uoadl:3093370
In this paper, we examine the possibility of generating bright and dark solitons, as well as multi-pulse solitary waves in Bose-Einstein condensates. Starting from the linear limit of the problem, where such solutions are known explicitly, we use ‘
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=od______2127::c0797b293066184ee57b7a14a6c30388
https://pergamos.lib.uoa.gr/uoa/dl/object/uoadl:3093873
https://pergamos.lib.uoa.gr/uoa/dl/object/uoadl:3093873