2013 Fiscal Year Final Research Report
Physics of Quantum Phase Transitions - Topological Quantum Criticality, Quantum Multi-Criticality and Novel Quantum Phases
| Project/Area Number |
22340090
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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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 |
IMADA Masatoshi 東京大学, 工学(系)研究科(研究院), 教授 (70143542)
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| Co-Investigator(Kenkyū-buntansha) |
MISAWA Takahiro 東京大学, 大学院・工学系研究科, 助教 (10582687)
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| Project Period (FY) |
2010-04-01 – 2014-03-31
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| Keywords | 量子臨界現象 / 非フェルミ液体 / トポロジカル相転移 / モット転移 / マージナル量子臨界 |
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| Research Abstract |
Nature of novel quantum criticality including marginal quantum criticality and quantum multi-criticality characterized by topology changes as well as proximity effects of first-order transitions were clarified. It was revealed that the divergence of the fluctuations at zero wave number generated around the multi-critical points is the origin of several unprecedented non-Fermi liquid properties. Quantum phase transitions between zero-gap semiconductors and topological insulators are shown to have dual characters of spontaneous symmetry breaking and topology change and thus show novel criticality. We have elucidated the mechanism of high-temperature superconductivity generated by the marginal quantum criticality.
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Research Products
(32 results)
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[Journal Article] Raman-Scattering Measurements and Theory of the Energy-Momentum Spectrum for Underdoped Bi_2Sr_2CaCuO_(8+δ) Superconductors : Evidence of an s-Wave Structure for the Pseudogap2013
Author(s)
Shiro Sakai, Sebastien Blanc, Marcello Civelli, Yann Gallais, Maximilien Cazayous, Marie-Aude Méasson, Jinsheng Wen, Zhijun Xu, Genda Gu, Giorgio Sangiovanni, Yukitoshi Motome, Karsten Held, Alain Sacuto, Antoine Georges, and Masatoshi Imada
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Journal Title
Phys. Rev. Lett.
Volume: 111
Pages: 107001(1-5)
DOI
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