Ryosuke ISHIGURO

Postdoctoral Researcher, Quantum Condensed Phases Research, Team Center for Emergent Matter Science RIKEN

Topics of Research：: Study of the chiral superconducting phase by using chiral p-wave and s-wave superconducting hybride dc SQUIDs

■ Laboratory Website　
■ Description of Research [1121KB]

RESEARCH

My main research field follows: superfluid helium 3 and 4, solid helium, novel superconducting junctions and superconducting quantum interference devices. Recently, I began to research the SQUID.　Recently, I started a research of superconductivity of ruthenate Sr₂RuO₄ which have a spin triplet chiral p-wave symmetry. It is considered as an electronic analogue of superfluid 3He-A.　

In this project "Topological Quantum Phenomena in Condensed Matter with Broken Symmetries", I fabricate hybrid Nb-Sr₂RuO₄ dc-SQUIDs, composed of Niobium, ruthenate and two Nb/Ru/Sr₂RuO₄ junctions, by building a Niobium bridge between two individual Ru islands of eutectic Ru-Sr₂RuO₄ and study superconducting phenomena primarily from chiral symmetry and ruthenate eutectic systems.

HYBRID SQUID

EDUCATION

1997: B.Sc. in Physics, Kyoto University (Advisors: Takao Mizusaki)
1999: M.S. in Physics, Kyoto University (Advisors: Takao Mizusaki)
2003: Ph.D. in Physics, Kyoto University (Advisors: Takao Mizusaki)

PROFESSIONAL EXPERIENCE

2003-2006: Postdoctoral Researcher, Ecole normale superieure
2006-2008: Postdoctoral Researcher, Osaka city University
2008-2013: Assistant Professor, Department of Applied Physics, Tokyo science University
2013-present: Postdoctoral Researcher, RIKEN

SELECTION OF PUBLICATIONS

"Fabrication of SQUIDs with Nb/Ru/Sr₂RuO₄ junctions",
R. Ishiguro, M. Yakabe, T. Nakamura, E. Watanabe, D. Tsuya, H. Oosato, Y. Maeno and H. Takayanagi,
Journal of Physics: Conference Series 400, 4 (17 2012).

" π junction transition in InAs self-assembled quantum dot coupled with SQUID",
S. Kim, R. Ishiguro, M. Kamio, Y. Doda, E. Watanabe, D. Tsuya, K. Shibata, K. Hirakawa and H. Takayanagi,
Applied Physics Letters 98, 063106 (Feb 7 2011).

"Superfluidity of grain boundaries and supersolid behavior",
S. Sasaki, R. Ishiguro, F. Caupin, H. J. Maris and S. Balibar,
Science 313, 1098-1100 (Aug 25 2006).

"Homogeneous nucleation of crystals by acoustic waves",
R. Ishiguro, F. Caupin and S. Balibar,
Europhysics Letters 75, 91-97 (Jul 2006).

"Pinning of texture and vortices of the rotating B-like phase of superfluid ³He confined in a 98% aerogel",
M. Yamashita, A. Matsubara, R. Ishiguro, Y. Sasaki, Y. Kataoka, M. Kubota, O. Ishikawa, Y. M. Bunkov, T. Ohmi, T. Takagi and T. Mizusaki,
Physical Review Letters 94, (Feb 25 2005).

"Coalescence of crystalline drops",
R. Ishiguro, F. Graner, E. Rolley and S. Balibar,
Physical Review Letters 93, (Dec. 2004).

"Vortex formation and annihilation in three textures of rotating superfluid ³He-A",
R. Ishiguro, O. Ishikawa, M. Yamashita, Y. Sasaki, K. Fukuda, M. Kubota, H. Ishimoto, R. E. Packard, T. Takagi, T. Ohmi and T. Mizusaki,
Physical Review Letters 93, (Sep. 2004).