| Budget Amount *help |
¥19,370,000 (Direct Cost: ¥14,900,000、Indirect Cost: ¥4,470,000)
Fiscal Year 2019: ¥5,590,000 (Direct Cost: ¥4,300,000、Indirect Cost: ¥1,290,000)
Fiscal Year 2018: ¥5,590,000 (Direct Cost: ¥4,300,000、Indirect Cost: ¥1,290,000)
Fiscal Year 2017: ¥8,190,000 (Direct Cost: ¥6,300,000、Indirect Cost: ¥1,890,000)
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| Outline of Final Research Achievements |
We discovered "elastic anomaly" (increase in shear modulus at low temperatures) in 4He films adsorbed on graphite (Gr), a two-dimensional quantum many-body system. We also observed a coexistence of superfluidity and rigidity in the second layer. Our results shows that He films on Gr are characterized by "quantum phase transition picture", in which a insulator - superfluid transition occurs by the gap closure of localized and spatially extended states. We have studied elasticity and superfluidity of 4He films on the hexagonal boron nitride (hBN) surface, and have found elastic anomalies and superfluid transitions both of which are qualitatively same as those of the films on Gr.
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