| 研究課題/領域番号 |
14F04718
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| 研究機関 | 東京大学 |
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研究代表者 |
押川 正毅 東京大学, 物性研究所, 教授 (50262043)
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| 研究分担者 |
QUACH James 東京大学, 物性研究所, 外国人特別研究員
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| 研究期間 (年度) |
2014-04-25 – 2016-03-31
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| キーワード | Casimir effect / Bose-Einstein condensate / ultracold atoms |
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| 研究実績の概要 |
In Dr Quach’s most recent work, he derived an equation which gives the gravitonic contribution to the Casimir pressure for real bodies, i.e. non-idealised boundaries. This is an important contribution, because it allows researchers in the field to calculate the gravitational Casimir effect for general systems with real properties, which was not easy to do before this work. This work is published in the journal Physical Review Letters. As testament to the innovation of this work, it has been highlighted in APS’s online journal in the article titled, “Synopsis: A Casimir Effect Caused by Gravity”.
In collaboration with researchers from the University of Melbourne and RMIT University, Dr Quach showed that ulltracold atoms in optical lattices can exhibit negative refraction. This allows the possibility of building flat lens structures with ultracold atoms. This work is published in the journal Physical Review A.
Dr Quach has also contributed to the field of Bose-Einstein condensates (BECs). A unique feature of multi-component BECs is the possibility of beating frequencies in collective oscillations. Dr Quach analytically determined this beating frequency for the two-component BEC in one-dimension. Dr Quach’s contribution provides analytical formulae and predictions for the behaviour of two-component BECs, which will allow experimentalists in the field of ultra-cold atoms to empirically compare against. This work is published in the Journal of Physics B.
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| 現在までの達成度 (区分) |
現在までの達成度 (区分)
1: 当初の計画以上に進展している
理由
The "gravitational Casimir effect" has potentially important consequences and the paper has attracted considerable attention.
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| 今後の研究の推進方策 |
Dr Quach plans to extend his work in the gravitational Casimir effect by working with experimentalists to investigate the Casimir effect with superconductors. In particular, he plans to investigate whether the superconducting regime will have any measurable effect on the Casimir pressure, as speculated by the Heisenberg-Coulomb conjecture of enhance gravitational interactions.
Dr Quach’s recent achievements in showing how ultracold atoms in optical lattices can exhibit negative refraction forms a good basis upon which to further his research in quantum metamaterials. Dr Quach plans to further extend his work in ultracold atoms to investigate its potential as a quantum metamaterial. In particular he will investigate ultracold atom optical lattices as a means to achieve reconfigurable transformation optics and quantum cloaking.
One of the main aims of research in analogue models of gravity is the possibility of simulating semiclassical gravity phenomena, such as the Hawking radiation effect or cosmological particle production. In this sense, systems characterized by a high degree of quantum coherence, very cold temperatures, and low speeds of sound offer the best test field. Hence it in recent years BECs have become the subject of extensive study as possible analogue models of general relativity. Dr Quach plans to extend his research in BECs, to study them as analogue models of general relativity. In particular he plans to investigate the BEC as a simulator of quantum gravitational effects such as Hawking radiation.
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