| Project/Area Number |
25800228
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| Research Category |
Grant-in-Aid for Young Scientists (B)
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| Allocation Type | Multi-year Fund |
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| Research Field |
Atomic/Molecular/Quantum electronics
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| Research Institution | Kyoto University |
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Principal Investigator |
Danshita Ippei 京都大学, 基礎物理学研究所, 助教 (90586950)
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| Project Period (FY) |
2013-04-01 – 2016-03-31
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| Project Status |
Completed (Fiscal Year 2015)
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| Budget Amount *help |
¥3,770,000 (Direct Cost: ¥2,900,000、Indirect Cost: ¥870,000)
Fiscal Year 2015: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000)
Fiscal Year 2014: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000)
Fiscal Year 2013: ¥1,950,000 (Direct Cost: ¥1,500,000、Indirect Cost: ¥450,000)
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| Keywords | 冷却気体 / 光格子 / 超流動 / 量子相転移 / Higgsモード / Fano効果 / 孤立波 / 表面臨界現象 / 位相滑り |
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| Outline of Final Research Achievements |
We have studied the effects of impurities on properties of ultracold quantum gases, such as quantum phase transitions. Our main focus has been placed on single-component and two-component Bose gases, which are precisely controllable in experiments. We have successfully resolved some long-standing problems and found novel phenomena. Specifically, we have proposed a way to experimentally quantify the breakdown of superfluid flow due to quantum phase slips in a system of one-dimensional single-component Bose gases. As for two-component Bose gases in optical lattices, we have found surface critical phenomena caused by impurity potential. Moreover, we consider a relativistic superfluid of single-component Bose gases in optical lattices to predict the existence of a novel elementary excitation, namely the Higgs bound state.
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