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Dynamical stability of dipolar condensate in a parametrically modulated one-dimensional optical lattice

Chinese Physics B 2021年第6期30卷 143-148页

作者： Ji-Li ma Xiao-Xun Li Rui-Jin Cheng Ai-Xia Zhang Ju-Kui Xue College of Physics and Electronics Engineering Northwest Normal UniversityLanzhou 730070China

We study the stabilization properties of dipolar Bose–Einstein condensate in a deep one-dimensional optical lattice with an additional external parametrically modulated harmonic trap potential. Through both analytical and numerical methods, we solve a dimensionless nonlocal nonlinear discrete Gross–Pitaevskii equation with both the short-range contact interaction and the long-range dipole–dipole interaction. It is shown that, the stability of dipolar condensate in modulated deep optical lattice can be controled by coupled effects of the contact interaction, the dipolar interaction and the external modulation. The system can be stabilized when the dipolar interaction, the contact interaction, the average strength of potential and the ratio of amplitude to frequency of the modulation satisfy a critical condition. In addition, the breather state, the diffused state and the attractive-interaction-induced-trapped state are predicted. The dipolar interaction and the external modulation of the lattice play important roles in stabilizing the condensate.

关键词： Bose–Einstein condensate optical lattice dipole–dipole interaction periodic modulation

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Tonian–Ediacaran Tectonometamorphic History of the Sa'al Complex,Sinai(Egypt):Implications for the Tectonostratigraphic Framework of the Northern Arabian–Nubian Shield

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Acta Geologica Sinica(English Edition) 2022年第5期96卷 1545-1565页

作者： Mohamed W.ALI-BIK Suranjan GHOSH NPraBHAKAR Said Habd El raHIM Hilmy EMOUSSA Geological Sciences Department National Research Centre(NRC)DokkiCairo 12622Egypt Department of Earth Sciences Indian Institute of Technology BombayMumbai 400076India

The Sa'al Metamorphic Complex(SMC;southern Sinai)encompasses the oldest arc rocks in the Arabian–Nubian Shield,comprising two non-consanguineous metavolcanic successions(the Agramiya Group and the Post-ra'ayan Formation)separated by the metasediments of the ra'ayan *** experienced three distinct deformational events(D_(1)–D_(3))and two low-medium grade regional metamorphic events(M_1–M_(2)).The Agramiya Group and the ra'ayan Formation experienced all tectonometamorphic events(D_1–D_(3)and M_(1)–M_(2)),whereas the Post-ra'ayan volcanic rocks were only affected by the D_(3)and M_(2)events.D_(1)is an extensional event and is connected to the late Rodinia break-up(~Tonian;900–870 ma).The M_(1)metamorphism variably affected the older Agramiya Group,the rhyolitic tuffs experiencing lower to upper greenschist facies conditions and the basic and intermediate volcanic rocks undergoing amphibolite facies *** ra'ayan Formation metasediments experienced upper greenschist to amphibolite facies *** upper greenschist facies M_(2)affected the youngest Post-ra'ayan volcanic rocks and other stratigraphic *** compressive D_(2)and D_(3)events were coeval with the accretion of dismembered terranes in the assembly of Gondwana.D_(2)can be linked to the Tonian–Cryogenian arc-arc assembly(~880–760 ma;in Elat and Sinai),whereas D_(3)and the accompanying M_(2)is constrained to 622–600 ma(Ediacaran).

关键词： deformation microstructure metamorphism Sa'al Metamorphic Complex Arabian–Nubian Shield

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