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Koji Muraki, Dr. - Senior Distinguished Researcher - |
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| Quantum Solid State Physics Research Group NTT Basic Research Laboratories 3-1 Morinosato-Wakamiya, Atsugi 243-0198, Japan E-mail: koji.muraki  ntt.com |
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| 1994.4-Present | NTT Basic Research Laboratories | ||
| 2001.8-2002.3 | Guest Scientist at Max-Planck-Insititut, Stuttgart | ||
| 1994.3 | Ph.D, University of Tokyo | ||
| Effects of GaAs Buffer Layer on Structural, Magnetic, and Transport Properties of Magnetic Topological Insulators Cry(BixSb1-x)2-yTe3 and Vy(BixSb1-x)2-yTe3 Films |
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| Yusuke Nakazawa, Takafumi Akiho, Kiyoshi Kanisawa, Hiroshi Irie, Norio Kumada, Koji Muraki Phys. Status Solidi B (2025). [Journal page] |
| Andreev Reflection in the Quantum Hall Regime at an Al/InAs Junction on a Cleaved Edge |
| Takafumi Akiho, Hiroshi Irie, Yusuke Nakazawa, Satoshi Sasaki, Norio Kumada, and Koji Muraki Nano Letters 24, 14790 (2024). [Journal page] |
| Time-resolved counterpropagating edge transport in the topological insulating phase |
| H. Kamata, H. Irie, S. Sasaki, N. Kumada, and K. Muraki Phys. Rev. Research 6, 043073 (2024). [Journal page] |
| Effects of GaAs buffer layer on quantum anomalous Hall insulator Vy(BixSb1-x)2-yTe3 |
| Yusuke Nakazawa, Takafumi Akiho, Kiyoshi Kanisawa, Hiroshi Irie, Norio Kumada, and Koji Muraki Appl. Phys. Lett. B 125, 083101 (2024). [Journal page] |
| Gate-tunable giant superconducting nonreciprocal transport in few-layer Td-MoTe2 |
| T. Wakamura, M. Hashisaka, S. Hoshino, M. Bard, S. Okazaki, T. Sasagawa, T. Taniguchi, K. Watanabe, K. Muraki, and N. Kumada Phys. Phys. Res. 6, 013132 (2024). [Journal page] |
| Coherent-Incoherent Crossover of Charge and Neutral Mode Transport as Evidence for the Disorder-Dominated Fractional Edge Phase |
| Masayuki Hashisaka, Takuya Ito, Takafumi Akiho, Satoshi Sasaki, Norio Kumada, Naokazu Shibata, and Koji Muraki Phys. Phys. X 13, 031024 (2023). [Journal page] |
| Time-resolved measurement of ambipolar edge magnetoplasmon transport in InAs/InGaSb composite quantum wells |
| H. Kamata, H. Irie, N. Kumada, and K. Muraki Phys. Phys. Res. 4, 033214 (2022). [Journal page] |
| Impact of in situ controlled disorder screening on fractional quantum Hall effects and composite fermion transport |
| T. Akiho and K. Muraki Phys. Phys. B 106, 075302 (2022). [Journal page] |
| Gate tuning of fractional quantum Hall states in an InAs two-dimensional electron gas |
| S. Komatsu, H. Irie, T. Akiho, T. Nojima, T. Akazaki, and K. Muraki Phys. Phys. B 105, 075305 (2022). [Journal page] |
| Andreev reflection of fractional quantum Hall quasiparticles |
| M. Hashisaka, T. Jonckheere, T. Akiho, S. Sasaki, J. Rech, T. Martin, and K. Muraki Nature Comm. 12, 2794 (2021). [Journal page] |
| Energy gap tuning and gate-controlled topological phase transition in InAs/In_{x}Ga_{1-x}Sb composite quantum wells |
| H. Irie, T. Akiho, F. Couedo, K. Suzuki, K. Onomitsu, and K. Muraki Phys. Rev. Materials 4, 104201 (2020). [Journal page] |
| Counterflowing edge current and its equilibration in quantum Hall devices with sharp edge potential: Roles of incompressible strips and contact configuration |
| T. Akiho, H. Irie, K. Onomitsu, and K. Muraki Phys. Phys. B 99, 121303(R) (2019). [Journal page] |
| Landau-Zener-Stuckelberg interference in coherent charge oscillations of a one-electron double quantum dot |
| Takeshi Ota, Kenichi Hitachi, and Koji Muraki Scientific Reports 8, 5491 (2018). [Journal page] |
| Waveform measurement of charge- and spin-densitywavepackets in a chiral Tomonaga-Luttinger liquid |
| M. Hashisaka, N. Hiyama, T. Akiho, K. Muraki and T. Fujisawa Nature Physics 13, 559 (2017). [Journal page] |
| Engineering quantum spin Hall insulators by strained-layer heterostructures |
| T. Akiho, F. Couedo, H. Irie, K. Suzuki, K. Onomitsu, and K. Muraki Appl. Phys. Lett. 109, 192105 (2016). [Journal page] |
| Single-edge transport in an InAs/GaSb quantum spin Hall insulator |
| Francois Couedo, Hiroshi Irie, Kyoichi Suzuki, Koji Onomitsu, and Koji Muraki Phys. Rev. B 94, 035301 (2016). [Journal page] |
| NMR probing of spin and charge order near odd-integer filling in the second Landau level |
| T. D. Rhone, L. Tiemann, and K. Muraki Phys. Rev. B 92, 041301(R) (2015). [Journal page] |
| Gate-controlled semimetal-topological insulator transition in an InAs/GaSb heterostructure |
| Kyoichi Suzuki, Yuichi Harada, Koji Onomitsu, and Koji Muraki Phys. Rev. B 91, 245309 (2015). [Journal page] |
| NMR profiling of quantum electron solids in high magnetic fields |
| L. Tiemann (*), T. D. Rhone (*), N. Shibata, and K. Muraki (* equal contribution) Nature Physics 10, 648-652 (2014). [Journal page] (published online, Jul. 20, 2014) |
| v = 5/2 fractional quantum Hall state in low-mobility electron systems: Different roles of disorder |
| Gerardo Gamez and Koji Muraki Phys. Rev. B 88, 075308 (2013). [Journal page] |
| Edge channel transport in the InAs/GaSb topological insulating phase |
| Kyoichi Suzuki, Yuichi Harada, Koji Onomitsu, and Koji Muraki Phys. Rev. B 87, 235311 (2013). [Journal page] |
| Real-space imaging of fractional quantum Hall liquids |
| Junichiro Hayakawa, Koji Muraki, and Go Yusa Nature Nanotechnology 8, 31 (2013). [Journal page] (published online, Dec. 2, 2012) |
| Impact of graphene quantum capacitance on transport spectroscopy |
| K. Takase, S. Tanabe, S. Sasaki, H. Hibino, and K. Muraki Phys. Rev. B 86, 165435 (2012). [Journal page] |
| Unraveling the Spin Polarization of the v = 5/2 Fractional Quantum Hall State |
| L. Tiemann, G. Gamez, N. Kumada, and K. Muraki Science 335, 828 (2012). [Journal page] (published online January 26 2012, Science Express) |
| Observation of hysteretic transport due to dynamic nuclear spin polarization in a GaAs lateral double quantum dot |
| T. Kobayashi, K. Hitachi, S. Sasaki, and K. Muraki Phys. Rev. Lett. 107, 216802 (2011). [Journal page] |
| Intrinsic Gap and Exciton Condensation in the vT=1 Bilayer System |
| P. Giudici, K. Muraki, N. Kumada, and T. Fujisawa Phys. Rev. Lett. 104, 056802 (2010). [Journal page] |
| Spin-Dependent Phase Diagram of the vT=1 Bilayer Electron System |
| P. Giudici, K. Muraki, N. Kumada, Y. Hirayama, and T. Fujisawa Phys. Rev. Lett. 100, 106803 (2008). [Journal page] |
| NMR Evidence for Spin Canting in a Bilayer v = 2 Quantum Hall System |
| N. Kumada, K. Muraki , and Y. Hirayama Phys. Rev. Lett. 99, 076805 (2007). [Journal page] |
Low-Frequency Spin Dynamics in a Canted Antiferromagnet |
| N. Kumada, K. Muraki , and Y. Hirayama Science 313, 329 (2006). [Journal page] |
| Spin Degree of Freedom in the v = 1 Bilayer Electron System Investigated by Nuclear Spin Relaxation |
| N. Kumada, K. Muraki, K. Hashimoto, and Y. Hirayama Phys. Rev. Lett 94, 096802 (2005). [Journal page] |
| Controlled Multiple Quantum Coherences of Nuclear Spins in a Nonometre-Scale Device |
| G. Yusa, K. Muraki, K. Takashina, K. Hashimoto, and Y. Hirayama Nature 434, 1001 (2005). [Journal page] |
| Effects of Inversion Asymmetry on Electron-Nuclear Spin Coupling in Semiconductor Heterostructures: Possible role of spin-orbit interactions |
| K. Hashimoto, K. Muraki, N. Kumada, T. Saku, and Y. Hirayama Phys. Rev. Lett 94, 146601 (2005). [Journal page] |
| Coulomb Drag as a Probe of the Nature of Compressible States in a Magnetic Field |
| K. Muraki, J. G. S. Lok, S. Kraus, W. Dietsche, K. von Klitzing, D. Schuh, M. Bichler, W. Wegscheider Phys. Rev. Lett. 92, 246801 (2004). [Journal page] |
| Electrically Controlled Nuclear Spin Polarization and Relaxation by Quantum Hall States |
| K. Hashimoto, K. Muraki, T. Saku, and Y. Hirayama Phys. Rev. Lett. 88, 176601 (2002). [Journal page] |
| Charge Excitations in Easy-Axis and Easy-Plane Quantum Hall Ferromagnets |
| K. Muraki, T. Saku, and Y. Hirayama Phys. Rev. Lett. 87, 196801 (2001). [Journal page] |
| Spin Transition of a Two-Dimensional Hole System in the Fractional Quantum Hall Effect |
| K. Muraki and Y. Hirayama Phys. Rev. B 59, R2502 (1999). [Journal page] |
| Effect of Valence Band Structure on the Fractional Quantum Hall Effect of Two-Dimensional Hole Systems |
| K. Muraki and Y. Hirayama Physica B 249, 65 (1998). [Journal page] |
| Fermi-Level Effect on Ga Self-Diffusion Studied Using (69)GaAs/(69)Ga(71)GaAs Isotope Superlattice |
| K. Muraki and Y. Horikoshi Inst. Phys. Conf. 145, 547 (1996). |
| Evidence for Resonant Electron Capture and Charge Buildup in AlGaAs/GaAs Quantum Wells |
| K. Muraki, A. Fujiwara, S. Fukatsu, Y. Shiraki, and Y. Takahashi Phys. Rev. B 53, 15 477 (1996). [Journal page] |
| Surface Segregation of In Atoms and its Influence on the Energy Levels in InGaAs/GaAs Quantum Wells |
| K. Muraki, S. Fukatsu, Y. Shiraki, and R. Ito Appl. Phys. Lett. 61, 557 (1992). [abstract] |
Full List of Publications (Since 1992)