Research of the dynamic Kosterlitz-Thouless phase transition in bilayer quantum Hall states
| 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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Report
(4 results)
Research Products
(47 results)
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[Presentation] High-Frequency ESR Measurements of Shallow Doped Si:P at Low Temperatures and Their Extension to Lower Temperatures for High μBB/kBT2014
Author(s)
K. Morimoto, Y. Fujii, S. Mitsudo, T. Mizusaki, H. Kikuchi, A. Fukuda, A. Matsubara, T. Ueno, M. Gwak, S.G. Lee, S. Lee, T. Saito and S. Vasiliev
Organizer
APES2014, IES and SEST2014 (APES-IES-SEST2014)
Place of Presentation
Nara
Year and Date
2014-11-12 – 2014-11-16
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