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Article type: Cover
2015 Volume 70 Issue 1 Pages
Cover1-
Published: January 05, 2015
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Article type: Appendix
2015 Volume 70 Issue 1 Pages
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Toshio Hyodo
Article type: Article
2015 Volume 70 Issue 1 Pages
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Published: January 05, 2015
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Article type: Index
2015 Volume 70 Issue 1 Pages
2-3
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Masahiko Shimoda
Article type: Article
2015 Volume 70 Issue 1 Pages
4-5
Published: January 05, 2015
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Kichizo Asai, Yoshihiko Kobayashi, Keisuke Sato
Article type: Article
2015 Volume 70 Issue 1 Pages
6-13
Published: January 05, 2015
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The perovskite cobaltites have been arousing widespread interest of researchers owing to the various spin states of Co^<3+>(3d)^6 ions and crossover among them. It has been known since 1966 that LaCoO_3 shows a spin crossover, or a spin-state transition, around 100K from the low spin (LS) nonmagnetic ground state with S=0 to a magnetic state. The relevant magnetic spin state of Co^<3+> still remains controversial. Although there have been many experimental results supporting the Jahn-Teller active intermediate spin (IS) state with S=1 as the magnetic state, there is instead a spectroscopic evidence for the high spin (HS) state with S=2. We argue a possibility that IS and HS states both excited in the 100K transition coexist above the transition temperature. The inhomogeneous spin phase may be caused by strong interactions among Co^<3+> ions in the magnetic spin states. We also review the magnetic and electronic anomaly around 500K which is commonly observed in RECoO_3 (RE = rare earth elements).
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Hideaki Obuse
Article type: Article
2015 Volume 70 Issue 1 Pages
14-24
Published: January 05, 2015
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It has been passed more than fifty years since P. W. Anderson had theoretically predicted localizations of electrons in disordered systems. The concepts of the Anderson localization and transition have been important in the condensed matter physics, and are getting more important after discoveries of new fascinating materials, such as the graphene and topological insulators. Furthermore, nowadays, experiments on the Anderson localization and transition can be carried not only on the conventional electrical materials but also on new platforms by cold atoms, lights, elastic waves, and so on. In this article, we review the previous work and introduce recent theoretical and experimental progresses on the Anderson localization and transition.
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Shuji Ishihara, Satoshi Sawai
Article type: Article
2015 Volume 70 Issue 1 Pages
25-30
Published: January 05, 2015
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In slime mold Dictyostelium discoideum, concentrations of phosphoinositide lipids propagate as waves accompanied by transient formation of dendritic filaments of actin. From confocal live-cell imaging and phase map analysis, we demonstrate that wave nucleation is F-actin dependent. Mathematical modeling of the key regulatory steps of phosphoinositide lipids suggests excitable reaction that can support initiation and propagation of the wave in the form of spiral and target. Phase-field simulations of membrane deformation coupled with the excitable phosphoinositide signaling suggest that some of the typical semi-periodic modes of random membrane deformation can be attributed to the property of wave-wave interactions.
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Hiroshi Watanabe, Tomonori Shirakawa, Seiji Yunoki
Article type: Article
2015 Volume 70 Issue 1 Pages
31-35
Published: January 05, 2015
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We have studied a three-orbital Hubbard model to understand the detailed electronic structure of 5d transition metal oxide Sr_2IrO_4. We have shown that the large spin-orbit coupling of 5d electrons induces the novel insulating state, characterized by an effective total angular momentum J_<eff>=1/2. This material is found to be located between Slater and Mott insulators. We have also proposed that the novel superconductivity is induced by electron doping for Sr_2IrO_4.
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Kohzo Hakuta
Article type: Article
2015 Volume 70 Issue 1 Pages
36-44
Published: January 05, 2015
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We discuss a quantum optical technology using optical nanofibers. The key point of this technology is to strongly confine the mode density of the light field around an optical nanofiber, that is a sub-wavelength diameter silica fiber, and to open a novel route for manipulating single atoms and single photons. First, we discuss theoretically how various freedoms of atoms and photons can be manipulated with optical nanofibers. Examples include spontaneous emission manipulation, photon correlations, and few-atom spectroscopy. Next, we show experimentally by placing a few atoms on an optical nanofiber, how the spontaneous emission from the atoms on the nanofiber is efficiently channeled into the fiber-guided modes, how photon correlations evolve by varying the number of atoms, and how a few atoms on a nanofiber behave as an optically dense system. Furthermore, we show theoretically how the characteristics can be enhanced by incorporating photonic crystal structures on nanofibers. Recent progress on the experimental realization of photonic crystal nanofibers and spontaneous emission manipulation is also discussed.
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[in Japanese]
Article type: Article
2015 Volume 70 Issue 1 Pages
45-47
Published: January 05, 2015
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[in Japanese], [in Japanese]
Article type: Article
2015 Volume 70 Issue 1 Pages
48-50
Published: January 05, 2015
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[in Japanese]
Article type: Article
2015 Volume 70 Issue 1 Pages
51-53
Published: January 05, 2015
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[in Japanese]
Article type: Article
2015 Volume 70 Issue 1 Pages
54-55
Published: January 05, 2015
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[in Japanese]
Article type: Article
2015 Volume 70 Issue 1 Pages
56-
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[in Japanese]
Article type: Article
2015 Volume 70 Issue 1 Pages
57-
Published: January 05, 2015
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[in Japanese]
Article type: Article
2015 Volume 70 Issue 1 Pages
57-58
Published: January 05, 2015
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2015 Volume 70 Issue 1 Pages
58-
Published: 2015
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[in Japanese]
Article type: Article
2015 Volume 70 Issue 1 Pages
59-
Published: January 05, 2015
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Article type: Appendix
2015 Volume 70 Issue 1 Pages
60-61
Published: January 05, 2015
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Article type: Appendix
2015 Volume 70 Issue 1 Pages
62-
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[in Japanese]
2015 Volume 70 Issue 1 Pages
62-63
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Article type: Appendix
2015 Volume 70 Issue 1 Pages
64-67
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Article type: Appendix
2015 Volume 70 Issue 1 Pages
67-
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2015 Volume 70 Issue 1 Pages
71-74
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Article type: Appendix
2015 Volume 70 Issue 1 Pages
74-75
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Article type: Appendix
2015 Volume 70 Issue 1 Pages
76-
Published: January 05, 2015
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