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• W1983804525 abstract "In this paper we theoretically investigate the nonlinear tunnelling of two weakly linked Bose–Einstein condensates in a double-well trap in a strong interaction regime with the two-body interaction extended to neighbouring lattice sites. As a consequence the boson Josephson-junction tunnelling depends on the atom–atom interaction and the total atom number as well. A crucial atom-pair tunnelling term, obtained directly from the extension, results in significant energy spectrum corrections and an abrupt change of the ground state viewed as quantum phase transition. An atom-number oscillation state with a tunable relative phase between two Bose–Einstein condensates predicted for the first time is seen to be a degenerate ground state in an interaction region. The quantum phase transitions between degenerate and non-degenerate ground states driven by the atom-pair tunnelling are analysed. We show the scaling behaviours and the critical exponents of fidelity susceptibility, which can classify the universality." @default.
• W1983804525 created "2016-06-24" @default.
• W1983804525 creator A5026717183 @default.
• W1983804525 creator A5028765996 @default.
• W1983804525 date "2010-12-23" @default.
• W1983804525 modified "2023-10-18" @default.
• W1983804525 title "Atom-pair tunnelling-induced quantum phase transition and scaling behaviour of fidelity susceptibility in the extended boson Josephson-junction model" @default.
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• W1983804525 doi "https://doi.org/10.1088/0953-4075/44/2/025101" @default.
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