2009 Fiscal Year Final Research Report
Quantum physical properties in Two-Dimensional Helium
| Project/Area Number |
17071002
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| Research Category |
Grant-in-Aid for Scientific Research on Priority Areas
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| Allocation Type | Single-year Grants |
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| Review Section |
Science and Engineering
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| Research Institution | The University of Tokyo |
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Principal Investigator |
FUKUYAMA Hiroshi The University of Tokyo, 大学院・理学系研究科, 教授 (00181298)
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| Co-Investigator(Kenkyū-buntansha) |
MORISHITA Masashi 筑波大学, 大学院・数理物質科学研究科, 助教 (90251032)
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| Co-Investigator(Renkei-kenkyūsha) |
OGATA Masao 東京大学, 大学院・理学系研究科, 教授 (60185501)
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| Project Period (FY) |
2005 – 2009
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| Keywords | 低温物性 / 量子流体 / フラストレーション / 強相関 / 超流動 / 多体交換相互作用 / フェルミ液体 / 低次元系 |
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| Research Abstract |
We have established the low-temperature quantum phase diagram of monolayer helium-three adsorbed on graphite, a model system for highly correlated fermions in two-dimensions, by carrying out heat-capacity and nuclear-magnetic-resonance measurements down to 0.1mK. The phase diagram involves many novel quantum phases or phenomena including the gas-liquid transition at low densities, the spin fluctuation effects in the Fermi liquid phase, a possible zero-point vacancy phase at densities in between the Fermi liquid and the low-density commensurate phases, the gapless spin-liquid magnetism in the low-density commensurate phase, and the frustrated ferromagnetism in the high-density incommensurate phase. We have also found theoretically the possibility of spin-mass separation in the zero-point vacancy phase even in two-dimensions.
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