2006 Fiscal Year Final Research Report Summary
Theory of Quantum Transport based on Spin and Orbital.
| Project/Area Number |
16340097
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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 | Tohoku University |
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Principal Investigator |
MAEKAWA Sadamichi Tohoku University, Institute for Materials, Research Professor, 金属材料研究所, 教授 (60005973)
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| Co-Investigator(Kenkyū-buntansha) |
FUKUYAMA Hidetoshi Tokyo University of Science, Graduate school of Science, Professor, 理学部, 教授 (10004441)
TOHYAMA Takami Kyoto University, Yukawa Institute for Theoretical Physics, Professor, 基礎物理学研究所, 教授 (70237056)
TAKAHASHI Saburo Tohoku University, Institute for Materials Research, Research Associate, 金属材料研究所, 助手 (60171485)
KOSHIBAE Wataru Sendai National College of Technology, General Science, Associate Professor, 総合科学科, 助教授 (20273253)
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| Project Period (FY) |
2004 – 2006
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| Keywords | Spin Current / Orbital wave / Spin charge separation / Non-linear Optics / Thermopower / Spin electronics / Oxide electronics / Transition metal oxide |
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| Research Abstract |
An electron has the internal degrees of freedom, spin・charge・orbital, which give rise to materials properties. The flow of charge of electrons is current, and electronics is based on the control of current. The electronics based on spin current is called spin-electronics. The dynamics of orbital is also expected in transition metal oxides.
In this project, the theory of quantum transport starting with the dynamics of these internal degrees of freedom of an electron has been constructed.
1.It is shown that the conversion between spin current and charge current can be obtained in a non-local spin Hall device together with an experimental group. Since the conversion is one of the Onsager reciprocal relations, it is a very basic concept in physics.
2.In a device consisting of superconductor/ferromagnet/superconductor tunnel junctions, the Josephson current flowing between two superconductors has the extra phase, π. This is called the π-junction. We have proposed that a superconducting ring with π-junction may be used as a quantum computing device (qubit) without applied magnetic field.
3.In several transition metal oxides such as Na_xCoO_2,we have shown that the orbital degeneracy causes an electronic lattice with is different from the crystal one. As a result, a variety of novel physical properties are expected. Based on the theory, we have formulated the anomalous Hall effect and giant thermopower observed in Na_xCoO_2.
In this project, we have investigated various quantum transport phenomena starting with the internal degrees of freedom of an electron.
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[Journal Article] Distinct spinon and holon dispersions in photoemission spectral functions from one-dimensional SrCuO_2.2006
Author(s)
B.J.Kim, H.Koh, E.Rotenberg, S.-J.Oh, H.Eisaki, N.Motoyama, S.Uchida, T.Tohyama, S.Maekawa, Z.-X.Shen, C.Kim
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Journal Title
Nature Physics 2
Pages: 397-401
Description
「研究成果報告書概要(和文)」より
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[Journal Article] Distinct spinon and holon dispersions in photoemissioi spectral functions from one-dimensional SrCuO_22006
Author(s)
B.J.Kim, H.Koh, E.Rotenberg, S.-J.Oh, H.Eisaki, N.Motoyama, S.Uchida, T.Tohyama, S.Maekawa, Z.-X.Shen, C.Kim
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Journal Title
Nature Physics 2
Pages: 397-401
Description
「研究成果報告書概要(欧文)」より
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[Journal Article] Momentum Dependence of Charge Excitations in the Electron-Doped Superconductor Nd_<1.85>Ce_<0.15>CuO_4 : A Resonant Inelastic X-Ray Scattering Study2005
Author(s)
K.Ishii, K.Tsutsui, Y.Endoh, T.Tohyama, S.Maekawa, M.Hoesch, K.Kuzushita, M.Tsubota, T.Inami, J.Mizuki, Y.Murakami, K.Yamada
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Journal Title
Phys. Rev. Lett. 94
Pages: 207003(1-4)
Description
「研究成果報告書概要(和文)」より
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[Journal Article] Mott Gap Excitations in Twin-Free YBa_2Cu_3O_<7-δ> (Tc=93 K) Studied by Resonant Inelastic X-Ray Scattering.2005
Author(s)
K.Ishii, K.Tsutsui, Y.Endoh, T.Tohyama, K.Kuzushita, T.Inami, K.Ohwada, S.Maekawa, T.Masui, S.Tajima, Y.Murakami, J.Mizuki
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Journal Title
Phys. Rev. Lett. 94
Pages: 187002(1-4)
Description
「研究成果報告書概要(和文)」より
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[Journal Article] Electronic excitations in hole-doped La_<1-x>Sr_xMnO_3 studied by resonant inelastic X-ray scattering.2005
Author(s)
K.Ishii, T.Inami, K.Ohwada, K.Kuzushita, J.Mizuki, Y.Murakami, S.Ishihara, Y.Endoh, S.Maekawa, K.Hirota, Y.Moritomo
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Journal Title
J. Phys. Chem. Solids 66
Pages: 2157-2162
Description
「研究成果報告書概要(和文)」より
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[Journal Article] Dispersion relation of charge gap excitations in quasi-1D Mott insulators studied by resonant X-ray scattering.2005
Author(s)
D.Qian, Yinwan Li, M.Z.Hasan, D.M.Casa, T.Gog, Y.-D.Chuang, K.Tsutsui, T.Tohyama, S.Maekawa, H.Eisaki, S.Uchida
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Journal Title
J. Phys. Chem. Solids 662
Pages: 2212-2215
Description
「研究成果報告書概要(和文)」より
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[Journal Article] Mott Gap Excitations in Twin-Free YBa_2Cu_3O_<7-δ> (T_c=93 K) Studied by Resonant Inelastic X-Ray Scattering.2005
Author(s)
K.Ishii, K.Tsutsui, Y.Endoh, T.Tohyama, K.Kuzushita, T.Inami, K.Ohwada, S.Maekawa, T.Masui, S.Tajima, Y.Murakami, J.Mizuki
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Journal Title
Phys.Rev.Lett. 94
Pages: 187002 (1-4)
Description
「研究成果報告書概要(欧文)」より
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[Journal Article] Momentum Dependence of Charge Excitations in the Electron-Doped Superconductor Nd_<1.85>Ce_<0.15>Cu0_4 : A Resonant Inelastic X-Ray Scattering Study.2005
Author(s)
K.Ishii, K.Tsutsui, Y.Endoh, T.Tohyama, S.Maekawa, M.Hoesch, K.Kuzushita, M.Tsubota, T.Inami, J.Mizuki, Y.Murakami, K.Yamada
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Journal Title
Phys.Rev.Lett. 94
Pages: 207003 (1-4)
Description
「研究成果報告書概要(欧文)」より
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[Journal Article] Electronic excitations in hole-doped La_<1-x>Sr_xMnO_3 studied by resonant inelastic X-ray scattering.2005
Author(s)
K.Ishii, T.Inami, K.Ohwada, K.Kuzushita, J.Mizuki, Y.Murakami, S.Ishihara, Y.Endoh, S.Maekawa, K.Hirota, Y.Moritomo
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Journal Title
J.Phys.Chem.Solids 66
Pages: 2157-2162
Description
「研究成果報告書概要(欧文)」より
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[Journal Article] Dispersion relation of charge gap excitations in quasi-1D Mott insulators studied by resonant X-ray scattering.2005
Author(s)
D.Qian, Yinwan Li, M.Z.Hasan, D.M.Casa, T.Gog, Y.-D.Chuang, K.Tsutsui, T.Tohyama, S.Maekawa, H.Eisaki, S.Uchida
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Journal Title
J.Phys.Chem.Solids 66
Pages: 2212-2215
Description
「研究成果報告書概要(欧文)」より
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[Journal Article] Resonant inelastic x-ray scattering study of the hole-doped manganites La_<1-x>Sr_xMnO_3 (x=0.2, 0.4)2004
Author(s)
K.Ishii, T.Inami, K.Ohwada, K.Kuzushita, J.Mizuki, Y.Murakami, S.Ishihara, Y.Endoh, S.Maekawa, K.Hirota, Y.Moritomo
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Journal Title
Phys. Rev. B 70
Pages: 224437(6)
Description
「研究成果報告書概要(和文)」より
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[Journal Article] Resonant inelastic x-ray scattering study of the hole-doped manganites La_<1-x>Sr_xMnO_3 (x=0.2,0.4).2004
Author(s)
K.Ishii, T.Inami, K.Ohwada, K.Kuzushita, J.Mizuki, Y.Murakami, S.Ishihara, Y.Endoh, S.Maekawa, K.Hirota, Y.Moritomo
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Journal Title
Phys.Rev.B 70
Pages: 224437 (6)
Description
「研究成果報告書概要(欧文)」より
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