論文リスト (太字: 重要な結果)
- 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 Lett. 24, 14790 (2024).
- 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).
- Effects of GaAs buffer layer on quantum anomalous Hall insulator Vy(BixSb1-x)2-yTe3
Y. Nakazawa, T. Akiho, K. Kanisawa, H. Irie, N. Kumada, and K. Muraki
Appl. Phys. Lett. 125, 083101 (2024).
- On-chip transfer of ultrashort graphene plasmon wavepackets using terahertz electronics
K. Yoshioka, G. Bernard, T. Wakamura, M. Hashisaka, K. Sasaki, S. Sasaki, K. Watanabe, T. Taniguchi, and N. Kumada
Nature Electronics 7, 537 (2024).
- 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. Rev. Research 6, 013132 (2024).
- Emission and coherent control of Levitons in graphene
A. Assouline, L. Pugliese, H. Chakraborti, S. Lee, L. Bernabeu, M. Jo, K. Watanabe, T. Taniguchi, D. C. Glattli, N. Kumada, H.-S. Sim, F. D. Parmentier, and P. Roulleau
Science 382, 1260 (2023).
- Coherent-Incoherent Crossover of Charge and Neutral Mode Transport as Evidence for the Disorder-Dominated Fractional Edge Phase
M. Hashisaka, T. Ito, T. Akiho, S. Sasaki, N. Kumada, N. Shibata, and K. Muraki
Phys. Rev. X 13, 031024 (2023).
- Fast time-domain current measurement for quantum dot charge sensing using a homemade cryogenic transimpedance amplifier
H. Bohuslavskyi, M. Hashisaka, T. Shimizu, T. Akiho, K. Muraki, and N. Kumada
Appl. Phys. Lett. 121, 184003 (2022).
- Time-resolved measurement of ambipolar edge magnetoplasmon transport in InAs/InGaSb composite quantum wells
H. Kamata, H. Irie, N. Kumada, and K. Muraki
Phys. Rev. Research 4, 033214 (2022).
- Scaling behavior of electron decoherence in a graphene Mach-Zehnder interferometer
M. Jo, J. M. Lee, A. Assouline, P. Brasseur, K. Watanabe, T. Taniguchi, P. Roche, D. C. Glattli, N. Kumada, F. D. Parmentier, H. -S. Sim & P. Roulleau
Nature Commun. 13, 5473 (2022).
- Ultrafast intrinsic optical-to-electrical conversion dynamics in graphene photodetector
Katsumasa Yoshioka, Taro Wakamura, Masayuki Hashisaka, Kenji Watanabe, Takashi Taniguchi, and Norio Kumada
Nature Photonics 16, 718 (2022).
- Homemade-HEMT-based transimpedance amplifier for high-resolution shot-noise measurements
Takase Shimizu, Masayuki Hashisaka, Heorhii Bohuslavskyi, Takafumi Akiho, Norio Kumada, Shingo Katsumoto, and Koji Muraki
Rev. Sci. Inst. 92, 124712 (2021).
- Excitonic nature of magnons in a quantum Hall ferromagnet
A. Assouline, M. Jo, P. Brasseur, K. Watanabe, T. Taniguchi, Th. Jolicoeur, D. C. Glattli, N. Kumada, P. Roche, F. D. Parmentier, and P. Roulleau
Nature Phys. 17, 1369 (2021).
- Quantum Hall Valley Splitters and a Tunable Mach-Zehnder Interferometer in Graphene
M. Jo, P. Brasseur, A. Assouline, G. Fleury, H.-S. Sim, K. Watanabe, T. Taniguchi, W. Dumnernpanich, P. Roche, D. C. Glattli, N. Kumada, F. D. Parmentier, and P. Roulleau
Phys. Rev. Lett. 126, 146803 (2021). (Featured in Physics, Editors' suggestion)
- On-chip coherent frequency-domain THz spectroscopy for electrical transport
Katsumasa Yoshioka, Norio Kumada, Koji Muraki, Masayuki Hashisaka
Appl. Phys. Lett. 117, 161103 (2020). (editor's pick)
- グラフェンプラズモンの応用
熊田倫雄、高村真琴
NTS出版 グラフェンから広がる二次元物質の新技術と応用
- Suppression of gate screening on edge magnetoplasmons by highly resistive ZnO gate
N. Kumada, N.-H. Tu, K.-i. Sasaki, T. Ota, M. Hashisaka, S. Sasaki, K. Onomitsu, and K. Muraki
Phys. Rev. B 101, 205205 (2020).
- Active spatial control of terahertz graphene plasmons
Ngoc Han Tu, Katsumasa Yoshioka, Satoshi Sasaki, Makoto Takamura, Koji Muraki, and Norio Kumada
Commun. Mater. 1, 7 (2020).
- Plasmon Control Driven by Spatial Carrier Density Modulation in Graphene
Makoto Takamura, Norio Kumada, Shengnan Wang, Kazuhide Kumakura, and Yoshitaka Taniyasu
ACS Photon. 6, 947 (2019).
- Plasmon confinement by carrier density modulation in graphene
Ngoc Han Tu, Makoto Takamura, Yui Ogawa, Satoru Suzuki, and Norio Kumada
Jpn. J. Appl. Phys. 57 110307 (2018).
- Coupling between Quantum Hall Edge Channels on Opposite Sides of a Hall Bar
N. H. Tu, M. Hashisaka, T. Ota, Y. Sekine, K. Muraki, T. Fujisawa, and N. Kumada
Solid State Commun. 283, 32 (2018).
- グラフェンp-n接合における非平衡エネルギー分布とショット雑音
熊田倫雄
固体物理 Vol.52 No.8 429 (2017).
- Charge fractionalization in artificial Tomonaga-Luttinger liquids with controlled interaction strength
Paul Brasseur, Ngoc Han Tu, Yoshiaki Sekine, Koji Muraki, Masayuki Hashisaka, Toshimasa Fujisawa, and Norio Kumada
Phys. Rev. B 96, 081101(R) (2017).
- Quantum Hall effect in epitaxial graphene with permanent magnets
F. D. Parmentier, T. Cazimajou, Y. Sekine, H. Hibino, H. Irie, D. C. Glattli, N. Kumada, and P. Roulleau
Scientific Reports 6, 38393 (2016).
- Andreev reflection and bound state formation in a ballistic two-dimensional electron gas probed by a quantum point contact
Hiroshi Irie, Clemens Todt, Norio Kumada, Yuichi Harada, Hiroki Sugiyama, Tatsushi Akazaki, and Koji Muraki
Phys. Rev. B 94, 155305 (2016).
- Evaluation of Disorder Introduced by Electrolyte Gating through Transport Measurements in Graphene
Andrew Browning, Norio Kumada, Yoshiaki Sekine, Hiroshi Irie, Koji Muraki, and Hideki Yamamoto
Appl. Phys. Express 9, 065102 (2016).
- グラフェンp-n接合を用いた電子のビームスプリッタ動作の原理実証に世界で初めて成功
熊田倫雄
電子情報通信学会誌ニュース解説 Vol.99 No.3 266 (2016).
- Shot noise generated by graphene p-n junctions in the quantum Hall effect regime
N. Kumada, F. D. Parmentier, H. Hibino, D. C. Glattli, and P. Roulleau
Nature Commun. 6, 8068 (2015).
- Resonant Edge Magnetoplasmons and Their Decay in Graphene
N. Kumada, P. Roulleau, B. Roche, M. Hashisaka, H. Hibino, I. Petkovic, and D. C. Glattli
Phys. Rev. Lett. 113, 266601 (2014).
- Effects of screening on the propagation of graphene surface plasmons
Ken-ichi Sasaki and Norio Kumada
Phys. Rev. B 90, 035449 (2014).
- Plasmon transport and its guiding in graphene
Norio Kumada, Romain Dubourget, Ken'ichi Sasaki, Shinichi Tanabe, Hiroki Hibino, Hiroshi Kamata, Masayuki Hashisaka, Koji Muraki, Toshimasa Fujisawa
New J. Phys. 16, 063055 (2014).
- 量子ホール端における電荷密度波のダイナミクス
橋坂昌幸、鎌田大、藤澤利正、熊田倫雄、村木康二
個体物理 Vol.49 No.5 359 (2014).
- Fractionalized wave packets from an artificial Tomonaga-Luttinger liquid
H. Kamata, N. Kumada, M. Hashisaka, K. Muraki, and T. Fujisawa,
Nature Nanotech. 9, 177 (2014).
- グラフェンを用いたプラズモン伝搬制御
熊田 倫雄、田邉 真一、村木 康二、藤澤 利正
応用物理学会誌12月号
- Distributed-element circuit model of edge magnetoplasmon transport
Masayuki Hashisaka, Hiroshi Kamata, Norio Kumada, Kazuhisa Washio, Ryuji Murata, Koji
Muraki, and Toshimasa Fujisawa
Phys. Rev. B 88, 235409 (2013).
- Tunable plasmons in graphene
N. Kumada, S. Tanabe, H. Hibino, H. Kamata, M. Hashisaka, K. Muraki, and T. Fujisawa
SPIE Newsroom
- Plasmon Transport in Graphene
Norio Kumada
NTT Technical Review August 2013 Vol. 11 No. 8
- グラフェン中のプラズモン伝導
熊田倫雄
NTT技術ジャーナル 6月号 19 (2013).
- Plasmon transport in graphene investigated by time-resolved electrical measurements
N. Kumada, S. Tanabe, H. Hibino, H. Kamata, M. Hashisaka, K. Muraki, and T. Fujisawa
Nature Commun. 4, 1363 (2013).
- All electrical probe of nuclear spin polarization and relaxation by spin phase transition peaks of the filling fraction nu=2/3 quantum hall effect
M. H. Fauzi, S. Watanabe, N. Kumada, and Y. Hirayama
J. Korean Physical Soc. 60, 1676 (2012).
- Unraveling the Spin Polarization of the nu = 5/2 Fractional Quantum Hall State
L. Tiemann, G. Gamez, N. Kumada, and K. Muraki
Science 335, 828 (2012).
- Low-frequency spin fluctuations in skyrmions confined by wires: Measurements of local nuclear spin relaxation
Takashi Kobayashi, Norio Kumada, Takeshi Ota, Satoshi Sasaki, and Yoshiro Hirayama
Phys. Rev. Lett. 107, 126807 (2011).
- Edge magnetoplasmon transport in gated and ungated quantum Hall systems
N. Kumada, H. Kamata, and T. Fujisawa
Phys. Rev. B 84, 045314 (2011).
- Dynamical d-wave condensation of exciton-polaritons in a two-dimensional square-lattice potential
Na Young Kim, Kenichiro Kusudo, Congjun Wu, Naoyuki Masumoto, Andreas Löffler, Sven Höfling, Norio Kumada, Lukas Worschech, Alfred Forchel, and Yoshihisa Yamamoto
Nature Phys. 7, 681 (2011).
- Field and Density Dependence of Edge Magnetoplasmon Transport in a Quantum Hall System
N. Kumada, H. Kamata, K. Muraki, and T. Fujisawa
J. Phys.: Conf. Ser. 334 012032 (2011).
- High-sensitive optical measurement of spin polarization in a quantum Hall system
H. Ito, T. Yamazaki, D. Fukuoka, K. Oto, K. Muro, Y. Hirayama, and N. Kumada
J. Phys.: Conf. Ser. 334 012021 (2011).
- Spin polarization in quantum Hall state obtained by Kerr rotation spectra
H. Ito, M. Seo, D. Fukuoka, K. Oto, K. Muro, Y. Hirayama, and N. Kumada
AIP Conf. Proc. 1399, 637 (2011).
- Anisotropy of Magnetoresistance Hysteresis around the nu=2/3 Quantum Hall State in Tilted Magnetic Field
K. Iwata, M. Morino, A. Fukuda, N. Kumada, Z. F. Ezawa, Y. Hirayama, and A. Sawada
J. Phys. Soc. Jpn. 79, 123701 (2010).
- Skyrmion effect on the relaxation of spin waves in a quantum Hall ferromagnet
D. Fukuoka, K. Oto, K. Muro, Y. Hirayama, and N. Kumada
Phys. Rev. Lett. 105, 126802 (2010).
- Nuclear spin polarization and relaxation probed by spin phase transition peak
S. Watanabe, M. H. Fauzi, N. Kumada, and Y. Hirayama
Phys. Status Solidi C 7, 2570 (2010).
- Activation study of collective excitations of the soliton-lattice phase in the nu=1 double-layer quantum Hall state
D. Terasawa, S. Kozumi, A. Fukuda, M. Morino, K. Iwata, N. Kumada, Y. Hirayama, Z. F. Ezawa and A. Sawada
Phys. Rev. B 81, 073303 (2010).
- Intrinsic gap and exciton condensation in the nu_T=1 bilayer system
P. Giudici, K. Muraki, N. Kumada, and T. Fujisawa
Phys. Rev. Lett. 104, 056802 (2010).
>>abstract
- Spectroscopic study of nuclear magnetic resonance induced by oscillating electron spin domain walls
S.Watanabe, G.Igarashi, K. Hashimoto, N.Kumada, and Y. Hirayama
Physica E 42, 999 (2010).
- Nuclear Spin Resonance Induced by Radio Frequency Electric Field
N. Kumada, T. Kamada, Y. Hirayama, S. Miyashita, and T. Fujisawa
AIP Conf. Proc. 1199, 461 (2010).
- Selective polarization of nuclear spins in a wire-like quantum Hall system
T. Kobayashi, N. Kumada, T. Ota, S. Sasaki and Y. Hirayama
AIP Conf. Proc. 1199, 241 (2010).
- Time-Resolved Kerr Rotation Spectroscopy of Spin Dynamics in a Quantum Hall System
D. Fukuoka, N. Tanaka, K. Oto, K. Muro, Y. Hirayama, N. Kumada, and H. Yamaguchi
AIP Conf. Proc. 1199, 243 (2010).
- Spin effects in the phase transition of the nu_T=1 bilayer electron system
K. Muraki, P. Giudici, and N. Kumada
Int. J. Mod. Phys. B 23, 2587 (2009).
- Electron spin imaging in quantum Hall devices by Kerr rotation measurement
K. Oto ,R. Inaba, T. Yamada, T. Yamazaki, K. Muro, Y. Hirayama, N. Kumada and H. Yamaguchi
Int. J. Mod. Phys. B 23, 2705 (2009).
- Optically induced nuclear spin polarization in quantum Hall regime observed by a time-resolved Kerr rotation
D. Fukuoka, N. Tanaka, K. Oto, K. Muro, Y. Hirayama, N. Kumada, H. Yamaguchi
Int. J. Mod. Phys. B 23, 2755 (2009).
- Activation study of the pseudospin soliton in the nu=1 bilayer quantum Hall effect
A. Fukuda, D. Terasawa, M. Morino, K. Iwata, S. Kozumi, T. Sekikawa, Y. Ogasawara, T. Arai, N. Kumada, Y. Hirayama, Z. F. Ezawa, and A. Sawada
J. Phys.: Conf. Ser. 150, 022012 (2009).
- Electron-spin/nuclear-spin interactions and NMR in semiconductors
Y. Hirayama, G. Yusa, K. Hashimoto, N. Kumada, T. Ota, and K. Muraki
Semicond. Sci. Technol. 24, 023001 (2009).
Semiconductor Science & Technology Highlights of 2009
- Electric-Field-Induced Nuclear Spin Resonance Mediated by Oscillating Electron Spin Domains in GaAs-Based Semiconductors
N. Kumada, T. Kamada, S. Miyashita, Y. Hirayama, T. Fujisawa
Phys. Rev. Lett. 101, 137602 (2008).
>>abstract
- Observation of Bogoliubov excitations in exciton-polariton condensates
S. Utsunomiya, L. Tian, G. Roumpos, C. W. Lai, N. Kumada, T. Fujisawa, M. Kuwata-Gonokami, A. Loffler, S. Hofling, A. Forchel, and Y. Yamamoto
Nature Physics 4, 700 (2008).
>>abstract
- Spin Dynamics of Two-Dimensional Electrons in a Quantum Hall System Probed by Time-Resolved Kerr Rotation Spectroscopy
D. Fukuoka, T. Yamazaki, N. Tanaka, K. Oto, K. Muro, Y. Hirayama, N. Kumada, and H. Yamaguchi
Phys. Rev. B 78, 041304(R) (2008).
>>abstract
- GaAs microcavity exciton-polaritons in a trap
Na Young Kim, Chih-Wei Lai, Shoko Utsunomiya, Georgios Roumpos, Hui Deng, Tim Byrnes, Patrik Recher, Norio Kumada, Toshimasa Fujisawa, and Yoshihisa Yamamoto
Phys. Stat. Sol. (b) 245, 1076 (2008).
- Modulation of bilayer quantum Hall states by tilted-field-induced subband-Landau-level coupling
N. Kumada, K. Iwata, K. Tagashira, Y. Shimoda, K. Muraki, Y. Hirayama, and A. Sawada
Phys. Rev. B. 77, 155324 (2008).
>>abstract
- Boundary-mediated electron-electron interactions in quantum point contacts
V. T. Renard, O. A. Tkachenko, V. A. Tkachenko, T. Ota, N. Kumada, J-C Portal, and Y. Hirayama
Phys. Rev. Lett. 100, 186801 (2008).
>>abstract
- Spin-dependent phase diagram of the nu_T=1 bilayer electron system
P. Giudici, K. Muraki, N. Kumada, Y. Hirayama, and T. Fujisawa
Phys. Rev. Lett. 100, 106803 (2008).
>>abstract
- NMR Study of a Canted Antiferromagnet in a Bilayer Quantum Hall System
N. Kumada, K. Muraki, and Y. Hirayama
Physica E 40, 937 (2008).
- Electron-electron interactions in clean quantum point contacts in the large conductance regime
V. T. Renard, O. A. Tkachenko, V. A. Tkachenko, T. Ota, N. Kumada, J. C. Portal, and Y. Hirayama
Physica E 40, 1684 (2008).
- Effects of In-plane Magnetic Field Direction on the Nuclear Spin Relaxation in the nu=2/3 Quantum Hall State
K. Iwata, M. Moriono, A. Fukuda, A. Sawada, M. Suzuki, Z. F. Ezawa, N. Kumada, and Y. Hirayama
Physica E 40, 1175 (2008).
- Anisotropic Magnetotransport by the Psudospin Soliton in the Bilayer nu=1 Quantum Hall System
A. Fukuda, M. Morino, K. Iwata, D. Terasawa, S. Kozumi, N. Kumada, Y. Hirayama, Z. F. Ezawa, and A. Sawada
Physica E 40, 1255 (2008).
- Activation Study of the Bilayer nu=1/3 Quantum Hall State
A. Fukuda, K. Iwata, T. Sekikawa, T. Arai, N. Kumada, Y. Hirayama, Z. F. Ezawa, and A. Sawada
Physica E 40, 1261 (2008).
- Initialization and logic gate operations of nuclear spin qubits using a submicron scale resistively-detected NMR device
T. Ota, G. Yusa, N. Kumada, S. Miyashita, and Y. Hirayama
Phys. Stat. Sol. (c) 5, 306 (2008).
- Nuclear-spin-based Quantum Information Devices in Solid-State Nanometer-Scale Structures
Norio Kumada, Takeshi Ota, and Koji Muraki
NTT Technical Review January 2008 Vol. 6 No. 1
- Coherence Time of Nuclear Spins in GaAs Quantum Well Probed by Submicron-Scale All-Electrical Nuclear Magnetic Resonance Device
Takeshi Ota, Norio Kumada, Go Yusa, Sen Miyashita, Toshimasa Fujisawa, and Yoshiro Hirayama
Jpn. J. Appl. Phys. 47, 3115 (2008).
- Pseudospin soliton in the nu=1 bilayer quantum Hall state
A. Fukuda, D. Terasawa, M. Morino, K. Iwata, S. Kozumi, N. Kumada, Y. Hirayama, Z. F. Ezawa, and A. Sawada
Phys. Rev. Lett. 100, 016801 (2008).
>>abstract
- Positive magneto-resistance in a point contact: possible manifestation of interactions
V. T. Renard, T. Ota, N. Kumada, and Y. Hirayama
International Journal of High Speed Electronics and Systems 17, 495 (2007).
- 固体ナノ構造における核スピン量子情報デバイス
熊田倫雄、太田剛、村木康二
NTT技術ジャーナル 11月号 14 (2007).
- Decoherence of nuclear spins due to dipole-dipole interactions probed by resistively detected nuclear magnetic resonance
T. Ota, G. Yusa, N. Kumada, S. Miyashita, T. Fujisawa, and Y. Hirayama
Appl. Phys. Lett. 91, 193101 (2007).
>>abstract
- Coherent zero-state and pi-state in an exciton-polariton condensate array
C. W. La, N. Y. Kim, S. Utsunomiya, G. Roumpos, H. Deng, M. D. Fraser, T. Byrnes, P. Recher, N. Kumada, T. Fujisawa, and Y. Yamamoto
Nature 450, 529 (2007).
>>abstract
- NMRによる量子ホール傾角反強磁性状態におけるゴールドストーンモードの観測
熊田倫雄、村木康二、平山祥郎
固体物理 Vol.42 No.9 551 (2007).
- NMR Evidence for Spin Canting in a Bilayer nu=2 Quantum Hall System
N. Kumada, K. Muraki, and Y. Hirayama
Phys. Rev. Lett. 99, 076805 (2007).
>>abstract
- Anisotropy of Current-pumped Nuclear Spin Polarization in the nu=2/3 Quantum Hall State
K. Iwata, M. Moriono, A. Fukuda, A. Sawada, M. Suzuki, Z. F. Ezawa, N. Kumada, and Y. Hirayama
AIP Conference Proceedings 893, 643 (2007).
- Effects of In-plane Magnetic Fields on the Canted Antiferromagnetic Phase in the Bilayer nu=2 Quantum Hall State
A. Fukuda, S. Kozumi, D. Terasawa, N. Kumada, Y. Hirayama, Z. F. Ezawa, and A. Sawada
AIP Conference Proceedings 893, 639 (2007).
- Interaction of Electron and Nuclear Spins in Quantum Wells
K. Muraki, N. Kumada, and Y. Hirayama
Int. J. Mod. Phys. B 21, 1266 (2007).
- Nuclear spin population and its control toward initialization using an all-electrical sub-micron scale nuclear magnetic resonance device
T. Ota, G. Yusa, N. Kumada, S. Miyashita, and Y. Hirayama
Appl. Phys. Lett. 90, 102118 (2007).
>>abstract
- Study of nuclear quadrupolar interaction using a novel all-electrical GaAs NMR device
T. Ota, N. Kumada, G. Yusa, S. Miyashita, and Y. Hirayama
Phys. Stat. Sol. (c) 4, 1759 (2007).
- In-plane Field Induced Anisotropic Behavior of Hysteresis in the nu=2/3 Quantum Hall State
K. Iwata, A. Fukuda, A. Sawada, M. Moriono, Z. F. Ezawa, M. Suzuki, N. Kumada, and Y. Hirayama
Proceedings of MS+S
- Phase Diagram of the nu=2 Bilayer Quantum Hall State
A. Fukuda, A. Sawada, K. Iwata, S. Kozumi, D. Terawasa, Y. Shimoda, Z. F. Ezawa, N. Kumada, and Y. Hirayama
Proceedings of MS+S
- Low-Frequency Spin Dynamics in a Canted Antiferromagnet
N. Kumada, K. Muraki, and Y. Hirayama
Science 313, 329 (2006).
>>abstract
- Nuclear-spin-lattice relaxation in a nu=1 bilayer quantum Hall state
N. Kumada, K. Muraki, and Y. Hirayama
Physica E 34, 164 (2006).
- Anisotropic magnetotransport near the nu=2/3 quantum Hall state
M. Morino, K. Iwata, M. Suzuki, A. Fukuda, A. Sawada, Z. F. Ezawa, N. Kumada, and Y. Hirayama
Physica E 34, 152 (2006).
- Stability of Soliton Lattice phase in the nu=1 Bilayer Quantum Hall State under Tilted Magnetic Fields
D. Terasawa, A. Fukuda, S. Kozumi, Z. F. Ezawa, A. Sawada, N. Kumada, and Y. Hirayama
Physica E 34, 81 (2006).
- Quantum Transport Study of a Canted Antiferromagnetic Phase in nu=2 Bilayer Quantum Hall State
A. Fukuda, S. Kozumi, D. Terasawa, Y. Shimoda, N. Kumada, Y. Hirayama, Z. F. Ezawa, and A. Sawada
Physica E 34, 77 (2006).
- Magnetotransport Study of the Canted Antiferromagnetic Phase in Bilayer nu=2 Quantum Hall State
A. Fukuda, S. Kozumi, D. Terasawa, Y. Shimoda, N. Kumada, Y. Hirayama, Z. F. Ezawa, and A. Sawada
Phys. Rev. B 73, 165304 (2006).
- Magnetoresistance Peak in the nu=2 Bilayer Quantum Hall State under Tilted Magnetic Field
A. Fukuda, S. Kozumi, D. Terasawa, N. Kumada, Y. Hirayama, Z. F. Ezawa, and A. Sawada
AIP Conference Proceedings 850, LT24, 1337 (2006).
- Anisotropic behavior of hysterestic transport phenomena in the nu=2/3 quantum Hall state in the tilted magnetic
field
K. Iwata, M. Morino, A. Fukuda, A. Sawada, Z. F. Ezawa, M. Suzuki, N. Kumada, and Y. Hirayama
AIP Conference Proceedings 850, LT24, 1339 (2006).
- Anisotropic Magnetotransport Near The Bilayer nu=2/3 Quantum Hall State
M. Morino, K. Iwata, M. Suzuki, A. Fukuda, A. Sawada, Z. F. Ezawa, N. Kumada, and Y. Hirayama
AIP Conference Proceedings 850, LT24, 1335 (2006).
- Effects of inversion asymmetry on electron-nuclear spin coupling in semiconductor heterostructures: A possible role of spin-orbit interactions
K. Hashimoto, K. Muraki, N. Kumada, and Y. Hirayama
Phys. Rev. Lett. 94, 146601 (2005).
>>abstract
- Pseudospin domain of nu=1 double-layer quantum Hall state near commensurate-incommensurate transition
D. Terasawa, S. Kozumi, A. Fukuda, A. Sawada, Z. F. Ezawa, N. Kumada, and Y. Hirayama
Journal of Physics and Chemistry of Solids 66, 1560 (2005).
- Anisotropic magnetotransport around the nu=1 bilayer quantum Hall state
K. Iwata, M. Morino, M. Suzuki, A. Fukuda, A. Sawada, Z. F. Ezawa, N. Kumada, and Y. Hirayama
Journal of Physics and Chemistry of Solids 66, 1556 (2005).
- Spin degree of freedom in the nu=1 bilayer electron system investigated by nuclear spin relaxation
N. Kumada, K. Muraki, K. Hashimoto, and Y. Hirayama
Phys. Rev. Lett. 94, 096802 (2005).
>>abstract
- Strong to weak correlation phase transition at nu_T=1 in a bilayer system detected by nuclear-spin-relaxation time
N. Kumada, K. Muraki, K. Hashimoto, T. Saku, and Y. Hirayama
AIP Conf. Proc. 772 567 (2005).
- Double magnetoresistance minima for nu=1 quantum Hall state near commensurate-incommensurate transition
D. Terasawa, K. Nakada, S. Kozumi, A. Fukuda, A. Sawada, Z. F. Ezawa, N. Kumada, K. Muraki, T. Saku, and Y. Hirayama
AIP Conf. Proc. 772 563 (2005).
- In-plane filed induced anisotropy of the longitudinal resistance in a bilayer quantum Hall system
M. Morino, K. Iwata, M. Suzuki, A. Fukuda, A. Sawada, Z. F. Ezawa, N. Kumada, K. Muraki, T. Saku, and Y. Hirayama
AIP Conf. Proc. 772 565 (2005).
- Duoble magnetoresistance minima induced by the in-plane magnetic field for the nu=1 double-layer quantum Hall st
ate
D. Terasawa, K. Nakada, S. Kozumi, Z. F. Ezawa, A. Fukuda, A. Sawada, N. Kumada, K. Muraki, T. Saku, and Y. Hirayama
Int. J. Mod. Phys. B 18, 3709 (2004).
- Anisotropic transport on the nu=1 bilayer quantum Hall system under tilted magnetic filed
M. Morino, K. Iwata, M. Suzuki, Z. F. Ezawa, A. Sawada, N. Kumada, K. Muraki, T. Saku, and Y. Hirayama
Int. J. Mod. Phys. B 18, 3705 (2004).
- Phase diagrams of nu=2 and nu=2/3 quantum Hall states in bilayer systems
N. Kumada, D. Terasawa, M. Morino, K. Tagashira, A. Sawada, E. F. Ezawa, K. Muraki, Y. Hirayama and T. Saku
Phys. Rev. B 69, 155319 (2004).
>>abstract
- Simultaneous excitation of spins and pseudospins in the bilayer nu=1 quantum hall state
D. Terasawa, M. Morino, K. Nakada, S. Kozumi, A. Sawada, Z. F. Ezawa, N. Kumada, K. Muraki, T. Saku and Y. Hirayama
Physica E 22, 52 (2004).
- Effects of in-plane magnetic fields on spin transitions in bilayer quantum Hall states
N. Kumada, K. Tagashira, K. Iwata, A. Sawada, Z. F. Ezawa, K. Muraki, T. Saku and Y. Hirayama
Physica E 22, 36 (2004).
- Continuous transformation from spin- to pseudospin-type excitation
A. Sawada, D. Terasawa, N. Kumada, M. Morino, K. Tagashira, Z. F. Ezawa, K. Muraki, T. Saku and Y. Hirayama
Physica E 18, 118 (2003).
- Composite fermion interactions in bilayer nu=2/3 quantum Hall states
N. Kumada, Y. Shimoda, M. Morino, A. Sawada, E. F. Ezawa, K. Muraki, T. Saku, and Y. Hirayama
Proceedings of ICPS-26
- Phase diagram of interacting composite fermions in the bilayer nu=2/3 quantum Hall effect
N. Kumada, D. Terasawa, Y. Shimoda, H. Azuhata, A. Sawada, E. F. Ezawa, K. Muraki, T. Saku and Y. Hirayama
Phys. Rev. Lett. 89, 116802 (2002).
>>abstract
- Integer and fractional quantum Hall effects in bilayer electron systems
Z. F. Ezawa, A. Sawada and N. Kumada
J. Phys. Chem. Solid 63, 1298 (2002).
- Various phase transitions in nu=2/3 bilayer quantum Hall states
N. Kumada, D. Terasawa, Y. Shimoda, H. Azuhata, A. Sawada, E. F. Ezawa, K. Muraki, T. Saku and Y. Hirayama
Physica E 12, 32 (2002).
- Preferred number of flipped spins in Skyrmion excitation
N. Kumada, A. Sawada, E. F. Ezawa, H. Azuhata, S. Nagahama, K. Muraki, T. Saku and Y. Hirayama
Physica B 298, 169 (2001).
- Skyrmion excitations in monolayer nu=1 and bilayer nu=2 quantum Hall states
N. Kumada, A. Sawada, E. F. Ezawa, S. Nagahama, H. Azuhata, and T. Saku
Proceedings of ICPS-25
- Doubly enhanced skyrmions in nu=2 bilayer quantum Hall states
N. Kumada, A. Sawada, E. F. Ezawa, H. Azuhata, S. Nagahama, K. Muraki, T. Saku and Y. Hirayama
J. Phys. Soc. Jpn. 69, 3178 (2000).
>>abstract
- n(+)-GaAs back-gated double-quantum-well structures with full density control
K. Muraki, N. Kumada T. Saku and Y. Hirayama
Jpn. J. Appl. Phys. 39, 2444 (2000).
- Bilayer nu=2 quantum Hall state in parallel high magnetic field
A. Sawada, E. F. Ezawa, H. Ohno, Y. Horikoshi, N. Kumada, Y. Ohno, S. Kishimoto, F. Matsukura and S. Nagahama
Physica E 6, 615 (2000).
- Interlayer charge transfer in bilayer quantum Hall states at various filling factors
K. Muraki, T. Saku, Y. Hirayama, N. Kumada, A. Sawada and Z. F. Ezawa
Solid State Commun. 112, 625 (1999).
- Interlayer coherence in nu=1 and nu=2 bilayer quantum Hall states
A. Sawada, E. F. Ezawa, H. Ohno, Y. Horikoshi, A. Urayama, Y. Ohno, S. Kishimoto, F. Matsukura and N. Kumada
Phys. Rev. B 59, 14888 (1999).
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