Periodic Modulation Effect on Self-Trapping of Two weakly coupled Bose-Einstein Condensates

With phase space analysis approach, we investigate thoroughly the self-trapping phenomenon for two weakly coupled Bose-Einstein condensates (BEC) in a symmetric double-well potential. We identify two kinds of self-trapping by their different relative phase behavior. With applying a periodic modulation on the energy bias of the system we find the occurrence of the self-trapping can be controlled, saying, the transition parameters can be adjusted effectively by the periodic modulation. Analytic expressions for the dependence of the transition parameters on the modulation parameters are derived for high and low frequency modulations. For an intermediate frequency modulation, we find the resonance between the periodic modulation and nonlinear Rabi oscillation dramatically affects the tunnelling dynamics and demonstrate many novel phenomena. Finally, we study the effects of many-body quantum fluctuation on self-trapping and discuss the possible experimental realization of the model.Comment: 7 pages, 11 figure

The Realization of Figure and Background in Li Qingzhao’s Poems

AbstractThe rapidly rising cognitive poetics at the late 20th century is the novel interdisciplinary scientific tool between cognitive linguistics and literary criticism to interpret literary works. Figure and background separation principle is one of its main researches. Initially using this principle to study literary works, Stockwell and Tsur focus on the readers’ psychological cognitive mechanisms involved in comprehending literary discourse and conclude that figure and ground segregation principle are the fundamental characteristics of literary stylistic analysis. This paper mainly discusses its realization in Li Qingzhao’s poems and Ci-poems and its effects on formation of artistic conception, in hope of providing a new model for studying Chinese classical poems.RésuméLa montée rapide poétique cognitive à la fin du XXe siècle est le nouvel outil scientifique interdisciplinaire entre la linguistique cognitive et critique littéraire pour interpréter des œuvres littéraires. Principe de séparation de la figure et le fond est l’une de ses principales recherches. Initialement à l’aide de ce principe pour étudier des œuvres littéraires, Stockwell et Tsur mettre l’accent sur les mécanismes cognitifs psychologiques du lecteur impliquant à comprendre le discours littéraire et concluent que le principe de ségrégation de la figure et le sol est les caractéristiques fondamentales de l’analyse stylistique littéraire. Cet article traite principalement de sa réalisation dans les poèmes de Li Qingzhao et Ci-poèmes et ses effets sur la formation de la conception artistique, dans l’espoir d’offrir un nouveau modèle pour l’étude des poèmes classiques chinois