中国物理B ›› 2019, Vol. 28 ›› Issue (11): 110304-110304.doi: 10.1088/1674-1056/ab44b6
• SPECIAL TOPIC—Recent advances in thermoelectric materials and devices • 上一篇 下一篇
Atom-pair tunneling and quantum phase transition in asymmetry double-well trap in strong-interaction regime
Ji-Li Liu(刘吉利), Jiu-Qing Liang(梁九卿)
- 1 College of Physics and Information Engineering, Shanxi Normal University, Linfen 041004, China;
2 Institute of Theoretical Physics, Shanxi University, Taiyuan 030006, China
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
摘要： 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.
中图分类号: (Tunneling, Josephson effect, Bose-Einstein condensates in periodic potentials, solitons, vortices, and topological excitations)
- 03.75.Lm