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Atom-pair tunneling and quantum phase transition in asymmetry double-well trap in strong-interaction regime |
| Ji-Li Liu(刘吉利)1, Jiu-Qing Liang(梁九卿)2 |
1 College of Physics and Information Engineering, Shanxi Normal University, Linfen 041004, China;
2 Institute of Theoretical Physics, Shanxi University, Taiyuan 030006, China |
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Abstract The quantum effect of nonlinear co-tunnelling process, which is dependent on atom-pair tunneling and asymmetry of an double-well trap, is studied by using an asymmetrical extended Bose-Hubbard model. Due to the existence of atom-pair tunneling that describes quantum phenomena of ultracold atom-gas clouds in an asymmetrical double-well trap, the asymmetrical extended Bose-Hubbard model is better than the previous Bose-Hubbard model model by comparing with the experimental data cited from the literature. The dependence of dynamics and quantum phase transition on atom-pair tunneling and asymmetry are investigated. Importantly, it shows that the asymmetry of the extended Bose-Hubbard model, corresponding to the bias between double wells, leads to a number of resonance tunneling processes, which tunneling is renamed conditional resonance tunneling, and corrects the atom-number parity effect by controlling the bias between double wells.
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Received: 05 July 2019
Revised: 22 August 2019
Accepted manuscript online:
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PACS:
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03.75.Lm
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(Tunneling, Josephson effect, Bose-Einstein condensates in periodic potentials, solitons, vortices, and topological excitations)
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05.30.-d
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(Quantum statistical mechanics)
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67.85.Hj
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(Bose-Einstein condensates in optical potentials)
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| Fund: Project supported by the National Natural Science Foundation of China (Grant No. 11075099). |
Corresponding Authors:
Ji-Li Liu
E-mail: liujili2006@aliyun.com
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Cite this article:
Ji-Li Liu(刘吉利), Jiu-Qing Liang(梁九卿) Atom-pair tunneling and quantum phase transition in asymmetry double-well trap in strong-interaction regime 2019 Chin. Phys. B 28 110304
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