2013 Fiscal Year Final Research Report
Studies of Two Dimensional Quantum Fluids and Solids with Low Temperature LEED and STM
| Project/Area Number |
22244042
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| Research Category |
Grant-in-Aid for Scientific Research (A)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Condensed matter physics II
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| Research Institution | The University of Tokyo |
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Principal Investigator |
FUKUYAMA Hiroshi 東京大学, 理学(系)研究科(研究院), 教授 (00181298)
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| Co-Investigator(Kenkyū-buntansha) |
MATSUI Tomohiro 東京大学, 大学院理学系研究科, 助教 (40466793)
TODA Ryo 東京大学, 低温センター, 技術職員 (20452203)
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| Project Period (FY) |
2010-04-01 – 2013-03-31
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| Keywords | 単原子層 / 量子液体・固体 / 超低温物理 / STM / LEED / グラファイト |
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| Research Abstract |
Low temperature quantum phase diagrams of the first and second layers of helium-3 (3He) and helium-4 (4He) adsorbed on graphite were studied by specific heat measurements. Theoretically unexpected many-body condensation of two-dimensional 3He was discovered. In addition, the existence of a commensurate solid phase in the second layer of both 3He and 4He was confirmed, which had also been unexpected from the first-principles calculations. This phase is presumably a low-density quantum solid with zero-point defectons.
We succeeded in the first real-space imaging of monolayer of Krypton adsorbed on graphite with low temperature STM and confirmed the adsorption site of Kr to be the hollow site of graphite honeycomb lattice. A feasibility study of development of a LEED instrument which works at dilution refrigerator temperatures was successfully finished.
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