Faculty Profiles - KONTANI, Hiroshi

Papers - KONTANI, Hiroshi

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Intrinsic spin Hall effect in graphene: Numerical calculations in a multiorbital model Open Access

Onari Seiichiro, Ishikawa Yasuhito, Kontani Hiroshi, Inoue Jun-ichiro

PHYSICAL REVIEW B Vol. 78 ( 12 ) 2008.9

Unconventional pairing originating from the disconnected Fermi surfaces of superconducting LaFeAsO1-xFx Open Access

Kuroki Kazuhiko, Onari Seiichiro, Arita Ryotaro, Usui Hidetomo, Tanaka Yukio, Kontani Hiroshi, Aoki Hideo

PHYSICAL REVIEW LETTERS Vol. 101 ( 8 ) 2008.8

Magnetotransport properties governed by antiferromagnetic fluctuations in the heavy-fermion superconductor CeIrIn5 Open Access

Nakajima Y., Shishido H., Nakai H., Shibauchi T., Hedo M., Uwatoko Y., Matsumoto T., Settai R., Onuki Y., Kontani H., Matsuda Y.

PHYSICAL REVIEW B Vol. 77 ( 21 ) 2008.6

s-wave superconductivity due to Suhl-Kondo mechanism in Na(x)CoO(2)center dot yH(2)O: Effect of Coulomb interaction and trigonal distortion Open Access

Yada Keiji, Kontani Hiroshi

PHYSICAL REVIEW B Vol. 77 ( 18 ) 2008.5

Theory of ac anomalous Hall conductivity in d-electron systems Open Access

Tanaka T., Kontani H.

PHYSICAL REVIEW B Vol. 77 ( 19 ) 2008.5

Intrinsic spin Hall effect and orbital Hall effect in 4d and 5d transition metals Open Access

Tanaka T., Kontani H., Naito M., Naito T., Hirashima D. S., Yamada K., Inoue J.

PHYSICAL REVIEW B Vol. 77 ( 16 ) 2008.4

Giant intrinsic spin and orbital hall effects in Sr2MO4 (M=Ru, Rh, Mo) Open Access

Kontani H., Tanaka T., Hirashima D. S., Yamada K., Inoue J.

PHYSICAL REVIEW LETTERS Vol. 100 ( 9 ) 2008.3

Spin-Dependent Mass Enhancement under Magnetic Field in the Periodic Anderson Model Reviewed

S. Onari, H. Kontani and Y. Tanaka,

Journal of the Physical Society of Japan Vol. 77 page： 023703 2008.2

Anomalous transport phenomena in Fermi liquids with strong magnetic fluctuations Open Access

Kontani Hiroshi

REPORTS ON PROGRESS IN PHYSICS Vol. 71 ( 2 ) 2008.2

Spin-dependent mass enhancement under a magnetic field in the periodic Anderson model Open Access

Onari Seiichiro, Kontani Hiroshi, Tanaka Yukio

JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN Vol. 77 ( 2 ) 2008.2

Intrinsic spin and orbital Hall effects in d- and f-electron systems

Kontani H., Tanaka T., Naito M., Hirashima D. S., Yamada K., Inoue J.

JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN Vol. 77 page： 275-277 2008.1

*Intrinsic spin Hall effect and orbital Hall effect in 4d and 5d transition metals Reviewed Open Access

T. Tanaka, H. Kontani, M. Naito, T. Naito, D. S. Hirashima, K. Yamada, and J. Inoue

Physical Review B Vol. 77 page： 165117 2008

Language：English

We study the intrinsic spin Hall conductivity (SHC) in various 5d transition metals (Ta, W, Re, Os, Ir, Pt, and Au) and 4d transition metals (Nb, Mo, Tc, Ru, Rh, Pd, and Ag) based on the Naval Research Laboratory tight-binding model, which enables us to perform quantitatively reliable analysis. In each metal, the obtained intrinsic SHC is independent of resistivity in the low resistive regime (ρ<50 μΩ cm) whereas it decreases in proportion to ρ−2 in the high resistive regime. In the low resistive regime, the SHC takes a large positive value in Pt and Pd, both of which have approximately nine d electrons per ion (nd=9). On the other hand, the SHC takes a large negative value in Ta, Nb, W, and Mo, where nd<5. In transition metals, a conduction electron acquires the trajectory-dependent phase factor that originates from the atomic wave function. This phase factor, which is reminiscent of the Aharonov–Bohm phase, is the origin of the SHC in paramagnetic metals and that of the anomalous Hall conductivity in ferromagnetic metals. Furthermore, each transition metal shows huge and positive d-orbital Hall conductivity (OHC), independent of the strength of the spin-orbit interaction. Since the OHC is much larger than the SHC, it will be possible to realize an orbitronics device made of transition metals.

DOI： 10.1103/PhysRevB.77.165117

Intrinsic spin Hall effect in graphene: Numerical calculations in a multiorbital model Reviewed Open Access

S. Onari, Y. Ishikawa, H. Kontani, and J. Inoue

Physical Review B Vol. 78 page： 121403R 2008

Unconventional pairing originating from the disconnected Fermi surfaces of superconducting LaFeAsO1-xFx Reviewed Open Access

K. Kuroki, S. Onari, R. Arita, H. Usui, Y. Tanaka, H. Kontani and H. Aoki

Physical Review Letters Vol. 101 page： 087004 2008

Magnetotransport properties governed by antiferromagnetic fluctuations in the heavy-fermion superconductor CeIrIn5 Reviewed Open Access

Y. Nakajima, H. Shishido, H. Nakai, T. Shibauchi, M. Hedo, Y. Uwatoko, T. Matsumoto, R. Settai, Y. Onuki, H. Kontani, and Y. Matsuda

Physical Review B Vol. 77 page： 0214504 2008

Theory of ac anomalous Hall conductivity in d -electron systems Reviewed

T. Tanaka and H. Kontani

Physical Review B Vol. 77 page： 195129 2008

s-wave superconductivity due to Suhl-Kondo mechanism in NaxCoO2⋅yH2O: Effect of Coulomb interaction and trigonal distortion Reviewed

K. Yada and H. Kontani

Physical Review B Vol. 77 page： 184521 2008

*Anomalous Transport Phenomena in Fermi Liquids with Strong Magnetic Fluctuations Invited Reviewed Open Access

Hiroshi Kontani

Reports on Progress in Physics Vol. 71 page： 026501 2008

Authorship：Lead author Language：English Publishing type：Research paper (scientific journal)

In many strongly correlated electron systems, remarkable violation of the relaxation time approximation (RTA) is observed. The most famous example would be high-Tc superconductors (HTSCs), and similar anomalous transport phenomena have been observed in metals near their antiferromagnetic (AF) quantum critical point (QCP). Here, we develop a transport theory involving resistivity and Hall coefficient on the basis of the microscopic Fermi liquid theory, by considering the current vertex correction (CVC). In nearly AF Fermi liquids, the CVC accounts for the significant enhancements in the Hall coefficient, magnetoresistance, thermoelectric power, and Nernst coefficient in nearly AF metals. According to the numerical study, aspects of anomalous transport phenomena in HTSC are explained in a unified way by considering the CVC, without introducing any fitting parameters; this strongly supports the idea that HTSCs are Fermi liquids with strong AF fluctuations. In addition, the striking \omega-dependence of the AC Hall coefficient and the remarkable effects of impurities on the transport coefficients in HTSCs appear to fit naturally into the present theory. The present theory also explains very similar anomalous transport phenomena occurring in CeCoIn5 and CeRhIn5, which is a heavy-fermion system near the AF QCP, and in the organic superconductor \kappa-(BEDT-TTF).

DOI： 10.1103/PhysRevB.80.100401

Giant Intrinsic Spin and Orbital Hall Effects in Sr2MO4 (M=Ru,Rh,Mo) Reviewed

H. Kontani, T. Tanaka, D.S. Hirashima, K. Yamada, J. Inoue

Physical Review Letters Vol. 100 page： 096601 2008

Study of intrinsic spin and orbital Hall effects in Pt based on a (6s, 6p, 5d) tight-binding model Reviewed

H. Kontani, M. Naito, D.S. Hirashima, K. Yamada and J. Inoue

Journal of the Physical Society of Japan Vol. 76 page： 103702 2007.10

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Papers - KONTANI, Hiroshi