| Project/Area Number |
24540331
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Multi-year Fund |
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| Section | 一般 |
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| Research Field |
Condensed matter physics I
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| Research Institution | Hyogo Medical University |
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Principal Investigator |
FUKUDA Akira 兵庫医科大学, 医学部, 准教授 (70360633)
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| Co-Investigator(Kenkyū-buntansha) |
TERASAWA Daiju 兵庫医科大学, 医学部, 助教 (90589839)
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| Co-Investigator(Renkei-kenkyūsha) |
SAWADA Anju 京都大学, 低温物質科学研究センター, 教授 (90115577)
EZAWA Junichi 独立行政法人理化学研究所, 客員研究員 (90133925)
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| Project Period (FY) |
2012-04-01 – 2015-03-31
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| Project Status |
Completed (Fiscal Year 2014)
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| Budget Amount *help |
¥5,070,000 (Direct Cost: ¥3,900,000、Indirect Cost: ¥1,170,000)
Fiscal Year 2014: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2013: ¥1,690,000 (Direct Cost: ¥1,300,000、Indirect Cost: ¥390,000)
Fiscal Year 2012: ¥2,080,000 (Direct Cost: ¥1,600,000、Indirect Cost: ¥480,000)
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| Keywords | 量子ホール効果 / ２層系 / K-T転移 / 擬スピン / 半量子渦対 / グラフェン / 核スピン拡散 / SU(4)スカーミオン |
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| Outline of Final Research Achievements |
Bilayer ν=1 quantum Hall state (QHS) is discribed by the X-Y model of pseudospins with macroscopic quantum coherence. Kosterlitz-Thouless (K-T) phase transition is expected to occur by the dissociation and recombination of half-quantized vorticies. In this study, we observe the onset temperature TC of QHS in the bilayer ν=1 QHS using high-mobility GaAs semiconductor samples. Results indicate that TC is significantly related to the K-T temperature. We also measure the relaxation time of nuclear spins in the bilayer ν=1 QHS by means of dynamic nuclear poralization in the ν=2/3 QHS. Consequently we indicate the existence of the SU(4) skyrmions.
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