Theoretical study on the Quantum Statistical Aspects of BEC
BEC 量子统计方面的理论研究
基本信息
- 批准号:11216204
- 负责人:
- 金额:$ 12.54万
- 依托单位:
- 依托单位国家:日本
- 项目类别:Grant-in-Aid for Scientific Research on Priority Areas
- 财政年份:1999
- 资助国家:日本
- 起止时间:1999 至 2002
- 项目状态:已结题
- 来源:
- 关键词:
项目摘要
The A4 group consisted of theoreticians working on the physics of BEC. (1) Ueda's group studied on the physics of BEC under attractive interaction. The state of the attractive BEC is at best a metastable state and eventually collapses. They studied the mechanism of the BEC collapsing and found that a BEC near the critical temperature grows macroscopic quantum tunneling, and then the BEC collapses. The found also the quantization of circulation that was guaranteed in a repulsive BEC was only partially satisfied in an attractive BEC. The quantization of circulation is know as a signature of superfluidity. The breakdown of the quantization in an attractive BEC adds new insight on the fundamental properties of BEC. They studied also the dynamics of BEC when the interaction is switched from repulsive to attractive. Their findings are (i) when a large BEC is switched from repulsive to attractive interaction, various nonlinear pattern (shell structure, layered structure,....) is expected to appear. (ii) They studied the dynamics of vortex generated when the interaction is repulsive. They found various dynamical instabilities that was a function of the interaction strength. The instabilities cause fracture of the vortex, and the vortex collapses. (iii) They showed in an attractive BEC two-dimensional bright is stabilized if the sign and amplitude of the interaction potential is modulated. Ohmi and Machida studied on me phase separation of multi-state BEC, dynamics of the phase transition, a new method of generating vortices, and on the stability of vortices.
A4小组由研究BEC物理的理论家组成。(1)上田等人研究了吸引相互作用下的BEC物理。吸引BEC的状态最多是一个亚稳态,最终会崩溃。他们研究了BEC坍塌的机制,发现在临界温度附近的BEC产生宏观量子隧穿,然后BEC坍塌。他还发现,在排斥性BEC中保证的循环量子化在吸引性BEC中只得到部分满足。循环的量子化被认为是超流性的一个标志。在一个有吸引力的BEC量子化的故障增加了新的见解BEC的基本性质。他们还研究了当相互作用从排斥转变为吸引时BEC的动力学。他们的发现是:(i)当一个大的BEC从排斥相互作用转换到吸引相互作用时,各种非线性模式(壳结构,层状结构,.)预计会出现。(ii)他们研究了当相互作用是排斥时产生的涡旋的动力学。他们发现了各种动力学不稳定性,这是相互作用强度的函数。不稳定性导致涡破裂,涡坍缩。(iii)研究表明,在吸引BEC中,如果相互作用势的符号和振幅被调制,则二维亮是稳定的。Ohmi和町田研究了多状态BEC的相分离、相变动力学、产生涡旋的新方法以及涡旋的稳定性。
项目成果
期刊论文数量(100)
专著数量(0)
科研奖励数量(0)
会议论文数量(0)
专利数量(0)
H. Saito and M.. Ueda: "Dynamically Stabilized Bright Solitons in a Two-Dimensional Bose-Einstein Condensate"Phys. Rev. Lett.. 90. 040403 (1)-040403(4) (2002)
H. Saito 和 M.. Ueda:“二维玻色-爱因斯坦凝聚态中的动态稳定亮孤子”
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K. Machida and T.Ohmi: "Phenomenological Theory of Ferromagetic Superconductivity"Phys. Rev. Lett.. 86. 850-853 (2002)
K.町田和T.Ohmi:“铁磁超导现象学理论”物理学。
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H.Saito, M.Ueda: "Split instability of a vortex in an attractive Bose-Einstein condensate"Physical Review Letters. Vol.89・19. 190402(1)-190402(4) (2002)
H.Saito,M.Ueda:“有吸引力的玻色-爱因斯坦凝聚体中涡旋的分裂不稳定性”《物理评论快报》第 89 卷第 190402(1)-190402(4) (2002)。
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H.Saito, M.Ueda: "Power laws and collapsing dynamics of trapped Bose-Einstein condensates with attractive interaction"Phys.Rev.A.. Vol.63. 043601 (2001)
H.Saito、M.Ueda:“具有吸引相互作用的俘获玻色-爱因斯坦凝聚态的幂律和塌缩动力学”Phys.Rev.A.. Vol.63。
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- 影响因子:0
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M.Tubota, K.Kasamatsu, M.Ueda: "Vortex lattice formation in a rotating Bose-Einstein condensate"Phys.Rev.A. Vol.64. 023603 (2002)
M.Tubota、K.Kasamatsu、M.Ueda:“旋转玻色-爱因斯坦凝聚中的涡晶格形成”Phys.Rev.A。
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UEDA Masahito其他文献
UEDA Masahito的其他文献
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{{ truncateString('UEDA Masahito', 18)}}的其他基金
Initiation of kink-band failure of a unidirectional CFRP due to microscale fiber undulation
由于微尺度纤维波动引起单向 CFRP 扭结带失效
- 批准号:
20K04184 - 财政年份:2020
- 资助金额:
$ 12.54万 - 项目类别:
Grant-in-Aid for Scientific Research (C)
Prediction of failure in stress concentartion area of a complicated carbon fiber reinforced plastic part considering the microscopic structure
考虑微观结构的复杂碳纤维增强塑料件应力集中区失效预测
- 批准号:
17K06063 - 财政年份:2017
- 资助金额:
$ 12.54万 - 项目类别:
Grant-in-Aid for Scientific Research (C)
Compressive failure mechanism of a unidirectional carbon fiber reinforced plastic by means of X-ray computed tomography and the numerical simulation of longitudinal compression
X射线计算机断层扫描和纵向压缩数值模拟研究单向碳纤维增强塑料的压缩破坏机制
- 批准号:
26820014 - 财政年份:2014
- 资助金额:
$ 12.54万 - 项目类别:
Grant-in-Aid for Young Scientists (B)
Study on superfluidity of atomic gases with internal degrees of freedom.
具有内部自由度的原子气体超流性研究。
- 批准号:
17071005 - 财政年份:2005
- 资助金额:
$ 12.54万 - 项目类别:
Grant-in-Aid for Scientific Research on Priority Areas
Many-body effects on properties of attractive Bose-Einstein condensates.
对有吸引力的玻色-爱因斯坦凝聚体特性的多体效应。
- 批准号:
15340129 - 财政年份:2003
- 资助金额:
$ 12.54万 - 项目类别:
Grant-in-Aid for Scientific Research (B)