Publications

"Review: Observation of Majorana Bound States at a Free Surface of 3He-B"
Hiroki Ikegami and Kimitoshi Kono
J. Low Temp. Phys. 195, 343-257 (2019).
arXiv:1805.11231

“Chiral symmetry breaking in superfluid 3He-A",
Hiroki Ikegami, Yasumasa Tsutsumi, and Kimitoshi Kono,
Science 341, 59-62 (2013).
featured in RIKEN Research

“Evidence for Reentrant Melting in a Quasi-One-Dimensional Wigner Crystal”
Hiroki Ikegami, Hikota Akimoto, David G. Rees, and Kimitoshi Kono,
Phys. Rev. Lett. 109, 236802-1-5 (2012).

“Coexistence of Surface Superconducting and Three-Dimensional Topological Dirac States in Semimetal KZnBi”
Junseong Song, Sunghun Kim, Youngkuk Kim, Huixia Fu, Jahyun Koo, Zhen Wang, Gyubin Lee, Jouhahn Lee, Sang Ho Oh, Joonho Bang, Taku Matsushita, Nobuo Wada, Hiroki Ikegami, Jonathan D. Denlinger, Young Hee Lee, Binghai Yan, Yeongkwan Kim, and Sung Wng Kim
Phys. Rev. X 112, 021065-1-10 (2021).

“Insulating phase in two-dimensional Josephson junction arrays investigated by nonlinear transport“
Hiroki Ikegami and Yasunobu Nakamura
Phys. Rev. B 106, 184511-1-11 (2022). (Editors' Suggestion)
arXiv:2211.12435

“Positive Ion Critical Velocity for Nucleation of Quantized Vortices in Isotopically Pure 4He”,
Daisuke Takahashi, Hiroki Ikegami, and Kimitoshi Kono,
J. Low Temp. Phys. 212, 214–231 (2023).
preprint(Research Square)

“Insulating phase in two-dimensional Josephson junction arrays investigated by nonlinear transport“
Hiroki Ikegami and Yasunobu Nakamura
Phys. Rev. B 106, 184511-1-11 (2022). (Editors' Suggestion)
arXiv:2211.12435

“Coexistence of Surface Superconducting and Three-Dimensional Topological Dirac States in Semimetal KZnBi”
Junseong Song, Sunghun Kim, Youngkuk Kim, Huixia Fu, Jahyun Koo, Zhen Wang, Gyubin Lee, Jouhahn Lee, Sang Ho Oh, Joonho Bang, Taku Matsushita, Nobuo Wada, Hiroki Ikegami, Jonathan D. Denlinger, Young Hee Lee, Binghai Yan, Yeongkwan Kim, and Sung Wng Kim
Phys. Rev. X 112, 021065-1-10 (2021).

“Probing XY phase transitions in a Josephson junction array with tunable frustration”,
R. Cosmic, K. Kawabata, Y. Ashida, H. Ikegami, S. Furukawa, P. Patil, J. M. Taylor, and Y. Nakamura,
Phys. Rev. B 102, 094509-1-10 (2020).
arXiv:2001.07877

"Review: Observation of Majorana Bound States at a Free Surface of 3He-B"
Hiroki Ikegami and Kimitoshi Kono
J. Low Temp. Phys. 195, 343-257 (2019).
arXiv:1805.11231

"Circuit QED-based measurement of vortex lattice order in a Josephson junction array",
R. Cosmic, Hiroki Ikegami, Zhirong Lin, Kunihiro Inomata, Jacob M. Taylor, and Yasunobu Nakamura,
Phys. Rev. B 98, 060501(R)-1-5 (2018).
arXiv:1803.04113

“Anomalous Quasiparticle Reflection from the Surface of 3He-4He Dilute Solution”,
Hiroki Ikegami, Kitak Kim, Hyoungsoon Choi, Daisuke Sato, Kimitoshi Kono, and Yuriy P. Monarkha,
Phys. Rev. Lett. 119, 195302 (2017).
arXiv:1706.07533
featured in RIKEN Research

“Onset of Superfluidity in 3He Films”
Masamichi Saitoh, Hiroki Ikegami*, and Kimitoshi Kono,
Phys. Rev. Lett. 117, 205302-1-5 (2016).

“Observation of Intrinsic Magnus Force and Direct Detection of Chirality in Superfluid 3He-A”
Hiroki Ikegami, Yasumasa Tsutsumi, and Kimitoshi Kono,
J. Phys. Soc. Jpn. 84, 044602 -1-16 (2015).

“Melting of Wigner Crystal on Helium in Quasi-one-dimensional Geometry”,
Hiroki Ikegami, Hikota Akimoto, and Kimitoshi Kono,
J. Low Temp. Phys. 179, 251-263 (2015).

“Nonlinear Transport of Positive Ions Below a Free Surface of Topological Superfluid 3He-B”,
Hiroki Ikegami and Kimitoshi Kono,
J. Low Temp. Phys. 175, 718-724 (2014).

“Mobility of Ions Trapped Below a Free Surface of Superfluid 3He”,
Hiroki Ikegami, Suk Bum Chung, and Kimitoshi Kono,
J. Phys. Soc. Jpn. 82, 124607-1-12 (2013).

“Reentrant Melting of a Classical Quasi-One-Dimensional Wigner Crystal on the Surface of Liquid Helium”,
David. G. Rees, Hiroki Ikegami, and Kimitoshi Kono,
J. Phys. Soc. Jpn. 82, 124602-1-8 (2013).

“Chiral symmetry breaking in superfluid 3He-A",
Hiroki Ikegami, Yasumasa Tsutsumi, and Kimitoshi Kono,
Science 341, 59-62 (2013).
featured in RIKEN Research

“Unexpected Density Dependence of Mobility of Electron Bubbles Trapped below the Free Surface of Normal 3He”
Hiroki Ikegami, Takahiro Matsumoto, and Kimitoshi Kono,
J. Low Temp. Phys. 171, 159-164 (2013).

“Evidence for Reentrant Melting in a Quasi-One-Dimensional Wigner Crystal”
Hiroki Ikegami, Hikota Akimoto, David G. Rees, and Kimitoshi Kono,
Phys. Rev. Lett. 109, 236802-1-5 (2012).
featured in RIKEN Research Highlight

“Nonlinear Transports of Electrons on Liquid 4He in a 1.6 mm Channel”
Hiroki Ikegami, Hikota Akimoto, and Kimitoshi Kono,
J. Phys: Conf. Ser. 400, 012020-1-4 (2012).

“Revisit to the Transport Measurements of Electrons on Rotating Superfluid 4He”
Daisuke Takahashi, Hiroki Ikegami, and Kimitoshi Kono,
J. Phys. Soc. Jpn. 80, 025002-1-2 (2011).

“Melting of a quasi-one-dimensional Wigner crystal: Electrons on superfluid 4He in a narrow channel”
Hiroki Ikegami, Hikota Akimoto, and Kimitoshi Kono,
Phys. Rev. B 82, 201104(R)-1-4 (2010).

“Transport Properties of Two-dimensional Snowballs Below the Surface of 4He-II Under Rotation”
Daisuke Takahashi, Hiroki Ikegami, and Kimitoshi Kono,
J. Low Temp. Phys. 158, 391-396 (2010).

“Electrostatic Manipulation of Level of Bulk Liquid for Studies of Saturated Superfluid 3He Films”
Masamichi Saitoh, Hiroki Ikegami, and Kimitoshi Kono,
J. Low Temp. Phys. 158, 716-721 (2010).

“Nonlinear Transport of the Wigner Solid on Superfluid 4He in a Channel Geometry”
Hiroki Ikegami, Hikota Akimoto, and Kimitoshi Kono,
Phys. Rev. Lett. 102, 046807-1-4 (2009).

“Quasiparticle scattering model for interpreting the Wigner solid resistivity on superfluid 3He”
Kimitoshi Kono, Hiroki Ikegami, and Yuriy Monarkha,
J. Phys. Soc. Jpn. 77, 111004-1-8 (2008).

“Superconductiving Transition in electron-Doped 12CaO7Al2O3”
Sung Wng Kim, Masashi Miyakawa, Masahiro Hirano, Yoshimitsu Kohama, Hitoshi Kawaji, Tooru Atake, Hiroki Ikegami, Kimitoshi Kono, and Hideo Hosono
Mater. Trans. 49, 1748-1752 (2008).

“Anisotropy of Superfluid 3He Near Free Surface Investigated by Surface State Electrons”
Hiroki Ikegami and Kimitoshi Kono,
J. Low Temp. Phys. 150, 145-153 (2008).

“Wigner Solid Transition of Electrons Confined in Microchannel”
Hiroki Ikegami, Hikota Akimoto, and Kimitoshi Kono,
J. Low Temp. Phys. 150, 224-229 (2008).

“One-Dimensional Phonon State of 4He Films Adsorbed in Straight Nanopores”
Yuki Matsushita, Junko Taniguchi, Ryo Toda, Hiroki Ikegami, Taku Matsushita, Mitsunori Hieda, and Nobuo Wada,
J. Low Temp. Phys. 150, 342-346 (2008).

“Superfluidity of 4He in One and Three Dimensions Realized in Nanopores”
Ryo Toda, Mitsunori Hieda, Taku Matsushita, Nobuo Wada, Junko Taniguchi, Hiroki Ikegami, Shinji Inagaki, and Yoshiaki Fukushima,
Phys. Rev. Lett. 99, 255301-1-4 (2007).
featured in RIKEN Research

“Superfluidity of 4He in Nano-Size Channels”
Hiroki Ikegami, Yoji Yamato, Tomohisa Okuno, Junko Taniguchi, Nobuo Wada, Shinji Inagaki, and Yoshiaki Fukushima,
Phys. Rev. B 76, 144503-1-9 (2007).

“Superconductivity in an Inorganic Electride 12CaO7Al2O3:e-”
Masashi Miyakawa, Sung Wng Kim, Masahiro Hirano, Yoshimitsu Kohama, Hitoshi Kawaji, Tooru Atake, Hiroki Ikegami, Kimitoshi Kono, and Hideo Hosono
J. Am. Chem. Soc. (Communication) 129, 7270-7271 (2007).

“Nonlinear Transport of Wigner Solid on Superfluid 3He-A”
Hiroki Ikegami and Kimitoshi Kono,
J. Low Temp. Phys. 148, 489-493 (2007).

“Texture of Superfluid 3He Probed by a Wigner Solid”
Hiroki Ikegami and Kimitoshi Kono,
Phys. Rev. Lett. 97, 165303-1-4 (2006).
featured in RIKEN Research

“One-dimensional 4He and 3He quantum fluids realized in nanopores”
N. Wada, T. Matsushita, R. Toda, Y. Matsushita, M. Hieda, J. Taniguchi, and H. Ikegami,
AIP Conf. Proc. 850, 289-296 (2006).

“Possible One-Dimensional 3He Quantum Fluid Formed in Nanopores”
Junko Taniguchi, Akira Yamaguchi, Hidehiko Ishimoto, Hiroki Ikegami, Taku Matsushita, Nobuo Wada, Silvina M. Gatica, Milton W. Cole, Francesco Ancilotto, Shinji Inagaki, and Yoshiaki Fukushima,
Phys. Rev. Lett. 94, 065301-1-4 (2005).

“Observation of 4He Superfluidity in 1.8 nm-Pores”
Hiroki Ikegami, Yoji Yamato, Tomohisa Okuno, Junko Taniguchi, and Nobuo Wada,
J. Low Temp. Phys. 138, 171-176 (2005).

“Dimensional-Crossover of 3He Gas Formed in One-Dimensional Nanometer Tunnel”
Yuki Matsushita, Junko Taniguchi, Akira Yamaguchi, Hidehiko Ishimoto, Hiroki Ikegami, Taku Matsushita, Nobuo Wada, Silvina M. Gatica, Milton W. Cole, and Francesco Ancilotto,
J. Low Temp. Phys. 138, 211-216 (2005).

“Influence of Adsorption Potential on 3He Fluid States Formed on 4He-Preplated Substrates”
Taku Matsushita, Ryo Toda, Yuki Matsushita, Junko Taniguchi, Hiroki Ikegami, and Nobuo Wada,
J. Low Temp. Phys. 138, 289-294 (2005).

“Influence of 4He Preplating on 3He Fluid Formed in One-dimensional 28Å-Pores”
Junko Taniguchi, Akira Yamaguchi, Hidehiko Ishimoto, Hiroki Ikegami, and Nobuo Wada,
J. Low Temp. Phys. 138, 165-170 (2005).

“Quest for the Ground State in Two-dimensional Antiferromagnetic Solid 3He”
Hidehiko Ishimoto, Ryuichi Masutomi, Hiroki Ikegami, Yoshitomo Karaki, and Akira Yamaguchi,
J. Phys. Chem. Solids. 66, 1417-1420 (2005).

“Zero- and One-Dimensional 4He Bose Fluids Realized in Nanometer Pores”
Nobuo Wada, Junko Taniguchi, Taku Matsushita, Ryo Toda, Yuki Matsushita, Hiroki Ikegami, Mitsunori Hieda, Akira Yamaguchi, and Hidehiko Ishimoto,
J. Phys. Chem. Solids. 66, 1512-1515 (2005).

“Observation of the Fermi Fluid in 3He-4He Mixture Films Formed in One-dimensional 28Å Pores”
Junko Taniguchi, Akira Yamaguchi, Hidehiko Ishimoto, Hiroki Ikegami, and Nobuo Wada,
J. Low Temp. Phys. 134, 595-600 (2004).

“Measurement of Superfluid 3He Film Flow by Inted-Digitated capacitors”
Masamichi Saitoh, Hiroki Ikegami, Hidekazu Mukuda, and Kimitoshi Kono,
J. Low Temp. Phys. 134, 357-362 (2004).

“Film Growth of 4He Adsorbed in Mesopores”
Hiroki Ikegami, Tomohisa Okuno, Yoji Yamato, Junko Taniguchi, Nobuo Wada, Shinji Inagaki, and Yoshiaki Fukushima,
Phys. Rev. B 68, 092501-1-4 (2003).

“Superfluidity of 4He film adsorbed on 47 Å pores”
Yoji Yamato, Hiroki Ikegami*, Tomohisa Okuno, Junko Taniguchi, and Nobuo Wada,
Physica B 329‑333, 284-285 (2003).

“Phonon velocity of 4He Bose fluids formed in one-dimensional 18 Å-pores”
Junko Taniguchi, Hiroki Ikegami, and Nobuo Wada,
Physica B 329‑333, 274-275 (2003).

“Studies of dynamical properties of superfluid 3He film flow by inted-digitated capacitors”
Masamichi Saitoh, Hiroki Ikegami, Hidekazu Mukuda, and Kimitoshi Kono,
Physica B 329‑333, 131-132 (2003).

“A Millikelvin Temperature Scale in High Magnetic Fields based on 3He Melting Pressure”
Hiroshi Fukuyama, Kazushi Yawata, Daisuke Ito, Hiroki Ikegami, and Hidehiko Ishimoto,
Physica B 329‑333, 1560-1561 (2003).

“Vapor Pressure and Heat Capacity Measurement of 3He Adsorbed on 18Å-Pores”
Junko Taniguchi, Tomohisa Okuno, Hiroki Ikegami, and Nobuo Wada,
J. Low Temp. Phys. 126, 259-264 (2002).

“4He Bose Fluids Formed in One-dimensional 18Å-diameter Pores”
Nobuo Wada, Junko Taniguchi, Hiroki Ikegami, Shinji Inagaki, and Yoshiaki Fukushima,
Phys. Rev. Lett. 86, 4322-4325 (2001).

“Search for Spin Liquid State in sub‑monolayer 3He Adsorbed on HD Preplated Graphite”
Hiroki Ikegami, Ryuichi Masutomi, Ken Obara, and Hidehiko Ishimoto,
Can. J. Phys. 79, 1433-1438 (2001).

“Low Temperature Magnetization of Sub‑monolayer 3He Adsorbed on HD Preplated Graphite”
Hiroki Ikegami, Ryuichi Masutomi, Ken Obara, and Hidehiko Ishimoto,
Phys. Rev. Lett. 85, 5146-5149 (2000).

“Layer-by Layer Growth of 4He Adsorbed on one-dimensional 18Å-Pores”
Junko Taniguchi, Tomohisa Okuno, Hiroki Ikegami, Nobuo Wada, Shinji Inagaki, and Yoshiaki Fukushima,
J. Low Temp. Phys. 121, 537-542 (2000).

“Low Temperature Magnetization of Two Dimensional 3He absorbed on HD Preplated Graphite”
Hiroki Ikegami, Ryuichi Masutomi, Ken Obara, and Hidehiko Ishimoto,
Physica B 284‑288, 222-223 (2000).

“Nuclear magnetizatism of sub-monolayer solid 3He on graphite”
Hiroki Ikegami, Ryuichi Masutomi, Ken Obara, and Hidehiko Ishimoto,
Physica B 280, 102-103 (2000).

“Competition of Multiple Spin Exchanges in Submonolayer Solid 3He”
Hiroki Ikegami, Ken Obara, Daisuke Ito, and Hidehiko Ishimoto,
Phys. Rev. Lett. 81, 2478-2481 (1998).

“Direct Observation of Andreev Reflection at Free Surface of Superfluid 3He”
Tetsuji Okuda, Hiroki Ikegami, Hikota Akimoto, and Hidehiko Ishimoto,
Phys. Rev. Lett. 80, 2857-2860 (1998).

“Positive Ion Mobility in Normal and Superfluid 3He at High Magnetic Field”
Andrei Golov, Ken Obara, Hiroki Ikegami, Hikota Akimoto, and Hidehiko Ishimoto,
J. Low Temp. Phys, 110, 225-230 (1998).

“Nuclear Magnetism of Submonolayer Solid 3He on Graphite”
Hiroki Ikegami, Ken Obara, Daisuke Ito, and Hidehiko Ishimoto,
J. Low Temp. Phys. 113, 277-286 (1998).

“3He Melting Pressure Measurements in High Magnetic Field”
Kazushi Yawata, Daisuke Ito, Hiroki Ikegami, Hidehiko Ishimoto, and Hiroshi Fukuyama,
J. Low Temp. Phys. 113, 769 -774 (1998).

“Andreev Reflection at Free Surface of Superfluid 3He”
Tetsuji Okuda, Hiroki Ikegami, Hikota Akimoto, and Hidehiko Ishimoto,
Czech. J. Phys. 46 Suppl. S1, 245-246 (1996).