Hideaki IWASAWA
Assistant Professor, Hiroshima Synchrotron Radiation Center, Hiroshima University- Topics of Research：
- Electronic and spin structures of bulk- and surface-derived states in ruthenate superconductor
■ Laboratory Website
■ Description of Research
[1107KB]
RESEARCH
Various intriguing physical properties of solids, represented by high-Tc and/or unconventional superconductivity, should be deeply related with dynamics of electrons in solids. So far, I have experimentally studied the fine electronic states in high-Tc cuprate and ruthenate superconductors using high-resolution angle-resolved photoemission spectroscopy (ARPES). My recent interests especially lie in how the electrons behave being coupled with internal degrees of freedom such as charge and spin of electrons, lattice vibrations, or orbitals, etc., and what kind of interactions are relevant for the formation of the Cooper-pairs. Ruthenate superconductor Sr2RuO4 is widely believed to exhibit the spin-triplet chiral p-wave superconductivity with broken time-reversal symmetry. To establish a foundation on understanding new exotic quantum phenomena, expected to emerge on the surface and/or interface of the spin-triplet superconductor, it is fundamentally important to clarify the electronic and spin structures of Sr2RuO4. In this project, I will investigate the electronic and spin structures of bulk- and surface-derived states in Sr2RuO4 using the state-of-the-art high-resolution ARPES and spin-resolved ARPES systems in Hiroshima Synchrotron Radiation Center, Hiroshima University.
EDUCATION
- 2003
- B.S. in Science, Tokyo University of Science
- 2005
- M.S. in Physics, Tokyo University of Science
- 2008
- Ph.D. in Physics, Tokyo University of Science
PROFESSIONAL EXPERIENCE
- 2008-2009
- Research Fellow (PD) of Japan Society for the Promotion of Science (Host: Hiroshima Synchrotron Radiation Center, Hiroshima University)
- 2009-2010
- Postdoctoral Researcher, Hiroshima Synchrotron Radiation Center, Hiroshima University
- 2010-2012
- Specially appointed Assistant Professor, Hiroshima Synchrotron Radiation Center, Hiroshima University
- 2012-Present
- Assistant Professor, Hiroshima Synchrotron Radiation Center, Hiroshima University
HONORS AND AWARDS
- 2006
- President's Award for students, Tokyo University of Science
- 2011
- President's Award, Hiroshima University
- 2012
- Young Researcher's Award, The Japanese Society for Synchrotron Radiation Research
SELECTION OF PUBLICATIONS
"'True' bosonic coupling strength in strongly correlated superconductors",
H. Iwasawa, Y. Yoshida, I. Hase, K. Shimada, H. Namatame, M. Taniguchi, and Y. Aiura,
Sci. Rep. 3, 1930-1-4, (May 2013).
"High-Energy Anomaly in the Band Dispersion of the Ruthenate Superconductor",
H. Iwasawa, Y. Yoshida, I. Hase, K. Shimada, H. Namatame, M. Taniguchi, and Y. Aiura,
Phys. Rev. Lett. 109, 066404-1-5, (Aug. 2012).
"The origin and non-quasiparticle nature of Fermi arcs in Bi2Sr2CaCu2O8+δ",
T. J. Reber, N. C. Plumb, Z. Sun, Y. Cao, Q.Wang, K. McElroy, H. Iwasawa, M. Arita, J. S.Wen, Z. J. Xu, G. Gu, Y. Yoshida, H. Eisaki, Y. Aiura, and D. S. Dessau,
Nat. Phys. 8, 606-610 (July 2012).
"Enhancement of hybridization between two-dimensional and one-dimensional bands due to Coulomb and spin-orbit interactions in Sr2RuO4",
Y. Aiura, I. Hase, Y. Yoshida, S. Koikegami, and H. Iwasawa,
J. Phys. Soc. of Jpn. 79, 123702-1-4 (Dec. 2010).
"Interplay among Coulomb Interaction, Spin-Orbit Interaction, and Multiple Electron-Boson Interactions in Sr2RuO4",
H. Iwasawa, Y. Yoshida, I. Hase, S. Koikegami, H. Hayashi, J. Jiang, K. Shimada, H. Namatame, M. Taniguchi, and Y. Aiura,
Phys. Rev. Lett. 105, 226406-1-4, (Nov. 2010).
"Isotopic Fingerprint of Electron-Phonon Coupling in High-Tc Cuprates",
H. Iwasawa, J. F. Douglas, K. Sato, T. Masui, Y. Yoshida, Z. Sun, H. Eisaki, H. Bando, A. Ino, M. Arita, K. Shimada, H. Namatame, M. Taniguchi, S. Tajima, S. Uchida, T. Saitoh, D. S. Dessau, and Y. Aiura
Phys. Rev. Lett. 101, 157005-1-4 (Oct. 2008).
"Unusual oxygen isotope effects in cuprates?",
J. F. Douglas, H. Iwasawa, Z. Sun, A. V. Fedorov, M. Ishikado, T. Saitoh, H. Eisaki, H. Bando, T. Iwase, A. Ino, M. Arita, K. Shimada, H. Namatame, M. Taniguchi, T. Masui, S. Tajima, K. Fujita, S.-I. Uchida, Y. Aiura, D. S. Dessau,
Nature 446, E5 (Mar. 2007).
"Orbital selectivity of the kink in the dispersion of Sr2RuO4",
H. Iwasawa, Y. Aiura, T. Saitoh, I. Hase, S. I. Ikeda, Y. Yoshida, H. Bando, M. Higashiguchi, Y. Miura, X. Y. Cui, K. Shimada, H. Namatame, and M. Taniguchi,
Phys. Rev. B 72, 104514-1-5, (Sep. 2005).
