大岩研究室　Oiwa Laboratory

2026

2025

• CNN-assisted automatic cross-capacitance matrix update for virtual-gate control of quantum dot arrays
  Tatsuo Tsuzuki, Hideaki Yuta, Yui Muto, Arne Ludwig, Andreas Dirk Wieck, Akira Oiwa and Takafumi Fujita
  Japanese Journal of Applied Physics 65, 1 (2025)
  link
• Electron g-factor of Ge strained by a SiGe substrate and its dependence on growth directions
  Imakire, K.;Oiwa, A.;Tokura, Y
  Japanese Journal of Applied Physics 64, 7 (2025)
  link
• Ray-based automatic tuning of a single quantum dot in a GaAs/AlGaAs quadruple dot array
  Kashtiban, Ehsan Alizadeh;Fujita, Takafumi;Oiwa, Akira
  Japanese Journal of Applied Physics 64, 2 (2025)
  link

2024

• Ray-based automatic tuning of a single quantum dot in a GaAs/AlGaAs quadruple dot array
  Ehsan Alizadeh Kashtiban, Takafumi Fujita, Akira Oiwa
  Japanese Journal of Applied Physics 64, 02SP22 (2024)
  link
• Electrically induced insulator-to-metal transition in InP-based ion-gated transistor
  Sunao Shimizu, Hiroki Shioya, Takafumi Hatano, Kazumoto Miwa, Akira Oiwa & Shimpei Ono
  Scientific Reports 14, 30364 (2024)
  link
• High-fidelity spin readout via the double latching mechanism
  Haruki Kiyama, Danny van Hien Hien, Arne Ludwig, Andreas D. Wieck, Akira Oiwa
  npj Quantum Information 10, 95 (2024)
  link
• Accelerated Adiabatic Passage of a Single Electron Spin Qubit in Quantum Dots
  Xiao-Fei Liu, Yuta Matsumoto, Takafumi Fujita, Arne Ludwig, Andreas D. Wieck, and Akira Oiwa
  Phys. Rev. Lett. 132, 027002 (2024)
  link

2023

• Anomalous Screening Effect of Superlattice-Doped GaAs/(Al,Ga)As Heterostructures under Illumination
  Xiao-Fei Liu, Nikolai Spitzer, Haruki Kiyama, Arne Ludwig, Andreas D. Wieck, and Akira Oiwa
  Phys. Rev. Applied 19, 024056 (2023)
  link
• Polarization-independent enhancement of optical absorption in a GaAs quantum well embedded in an air-bridge bull's-eye cavity with metal electrodes
  Sangmin Ji, Takeyoshi Tajiri, Xiao-Fei Liu, Haruki Kiyama, Akira Oiwa, Julian Ritzmann, Arne Ludwig, Andreas D Wieck and Satoshi Iwamoto
  Japanese Journal of Applied Physics 62, SC1018 (2023)
  link

2022

• Micromagnet design for addressable fast spin manipulations in a 2 × 2 quantum dot array
  Shungo Nakamura, Haruki Kiyama, Akira Oiwa
  Journal of Applied Physics 132, 224301 (2022)
  link
• Electron g-factor determined for quantum dot circuit fabricated from (110)-oriented GaAs quantum well
  T. Nakagawa, S. Lamoureux, T. Fujita, J. Ritzmann, A. Ludwig, A. D. Wieck, A. Oiwa, M. Korkusinski, A. Sachrajda, D. G. Austing, and L. Gaudreau
  Journal of Applied Physics 131, 134305 (2022)
  link

2021

• Detection of photogenerated single electrons in a lateral quantum dot with a surface plasmon antenna
  Rio Fukai, Yuji Sakai, Takafumi Fujita, Haruki Kiyama, Arne Ludwig, Andreas D. Wieck and Akira Oiwa
  Applied Physics Express 14, 125001 (2021)
  link
• Design of bull's-eye optical cavity toward efficient quantum media conversion using gate-defined quantum dot
  Sangmin Ji, Takeyoshi Tajiri, Haruki Kiyama, Akira Oiwa, and Satoshi Iwamoto
  Jpn. J. Appl. Phys. 60, 102003 (2021)
• Noise-robust classification of single-shot electron spin readouts using a deep neural network
  Yuta Matsumoto, Takafumi Fujita, Arne Ludwig, Andreas D. Wieck, Kazunori Komatani & Akira Oiwa
  npj Quantum Information 7, 136 (2021)
  link
• Preparation and Readout of Multielectron High-Spin States in a Gate-Defined GaAs/AlGaAs Quantum Dot
  H. Kiyama, K. Yoshimi, T. Kato, T. Nakajima, A. Oiwa, and S. Tarucha
  Phys. Rev. Lett. 127, 086802 (2021)
  link
• Distinguishing persistent effects in an undoped GaAs/AlGaAs quantum well by top-gate-dependent illumination
  Takafumi Fujita, Ryota Hayashi, Makoto Kohda, Julian Ritzmann, Arne Ludwig, Junsaku Nitta, Andreas D. Wieck, and Akira Oiwa
  J. Appl. Phys. 129, 234301 (2021)
  link
• Roadmap on quantum nanotechnologies
  A. Laucht, F. Hohls, N. Ubbelohde, M F. Gonzalez-Zalba, D. J Reilly, S. Stobbe, T. Schröder, P. Scarlino, J. V Koski, A. Dzurak, C.-H. Yang, J. Yoneda, F. Kuemmeth, H. Bluhm, J. Pla, C. Hill, J, Salfi, A. Oiwa, J. T Muhonen, E. Verhagen, M D LaHaye, H. Ho Kim, A. W Tsen, D. Culcer, A. Geresdi, J. A Mol, V. Mohan, P. K Jain and J. Baugh
  Nanotechnology 32, 162003 (2021)
• Characterization of a surface plasmon antenna fabricated on a gate-defined lateral quantum dot
  Rio Fukai, Yuji Sakai, Tomohiro Nakagawa, Takafumi Fujita, Haruki Kiyama, Arne Ludwig, Andreas D. Wieck and Akira Oiwa
  Japanese Journal of Applied Physics 60, SBBI01 (2021)
  link

2020

• Fabrication and optical characterization of photonic crystal nanocavities with electrodes for gate-defined quantum dots
  T. Tajiri, Y. Sakai, K. Kuruma, S. M. Ji, H. Kiyama, A. Oiwa, J. Ritzmann, A. Ludwig, A. D. Wieck, Y. Ota, Y. Arakawa, and S. Iwamoto
  Jpn. J. Appl. Phys. 59, SGGI05 (2020)
  link

2019

• Selective oxidation of the surface layer of bilayer WSe2 by laser heating
  Hiroki Shioya, Kazuhito Tsukagoshi, Keiji Ueno and Akira Oiwa
  Japanese Journal of Applied Physics 58, 120903 (2019)
  link
• Angular momentum transfer from photon polarization to an electron spin in a gate-defined quantum dot
  Takafumi Fujita, Kazuhiro Morimoto, Haruki Kiyama, Giles Allison, Marcus Larsson, Arne Ludwig, Sascha R. Valentin, Andreas D. Wieck, Akira Oiwa & Seigo Tarucha
  Nature Communications 10, 2991 (2019)
  link
• Entropy production by thermodynamic currents in ambipolar conductors with identical spin dynamics characteristics between holes and electrons
  Mst. Sanjida Aktar, Masamichi Sakai, Shigehiko Hasegawa, Osamu Nakamura, and Hiroyuki Awano
  Applied Physics Express 12, 053004 (2019)
  link
• Photogeneration of a single electron from a single Zeeman-resolved light-hole exciton with preserved angular momentum
  K. Kuroyama, M. Larsson, C. Y. Chang, J. Muramoto, K. Heya, T. Fujita, G. Allison, S. R. Valentin, A. Ludwig, A. D. Wieck, S. Matsuo, A. Oiwa, and S. Tarucha
  Physical Review B 99, 085203 (2019)
  link

2018

• Single-electron charge sensing in self-assembled quantum dots
  Haruki Kiyama, Alexander Korsch, Naomi Nagai, Yasushi Kanai, Kazuhiko Matsumoto, Kazuhiko Hirakawa, and Akira Oiwa
  Scientific Reports 8, 13188 (2018)
  link
• ポアンカレインターフェース　－単一光子偏光から単一電子スピンへの量子インターフェース－
  大岩顕, 藤田高史, 木山治樹, 黒山和幸, 松尾貞茂, 樽茶清悟
  光学 47, 148-154 (2018)
• Resonant Hall effect under generation of a self-sustaining mode of spin current in nonmagnetic bipolar conductors with identical characters between holes and electrons
  Masamichi Sakai, Hiraku Takao, Tomoyoshi Matsunaga, Makoto Nishimagi, Keitaro Iizasa, Takahito Sakuraba, Koji Higuchi, Akira Kitajima, Shigehiko Hasegawa, Osamu Nakamura, Yuichiro Kurokawa, and Hiroyuki Awano
  Japanese Journal of Applied Physics 57, 033001 (2018)

2017

• Gate tunable parallel double quantum dots in InAs double-nanowire devices
  S. Baba, S. Matsuo, H. Kamata, R. S. Deacon, A. Oiwa, K. Li, S. Jeppesen, L. Samuelson, H. Q. Xu, and S. Tarucha
  Applied Physics Letters 111, 233513 (2017)
• Single electron-photon pair creation from a single polarization-entangled photon pair
  Kazuyuki Kuroyama, Marcus Larsson, Sadashige Matsuo, Takafumi Fujita, Sascha R. Valentin, Arne Ludwig, Andreas D. Wieck, Akira Oiwa, and Seigo Tarucha
  Scientific Reports 7, 16968 (2017)
• Spin conversion on the nanoscale
  YoshiChika Otani, Masashi Shiraishi, Akira Oiwa, Eiji Saitoh, and Shuichi Murakami
  Nature Physics 13, 829-832 (2017)
• Design of bull's eye structures on gate-defined lateral quantum dots
  Rio Fukai, Tomohiro Nakagawa, Haruki Kiyama and Akira Oiwa
  Japanese Journal of Applied Physics 56, 04CK04 (2017)
  link
• Conversion from Single Photon to Single Electron Spin Using Electrically Controllable Quantum Dots
  Akira Oiwa, Takafumi Fujita, Haruki Kiyama, Giles Allison, Arne Ludwig, Andreas D. Wieck, and Seigo Tarucha
  Journal of the Physical Society of Japan 86, 011008 (2017)

2016

• Single-Shot Ternary Readout of Two-Electron Spin States in a Quantum Dot Using Spin Filtering by Quantum Hall Edge States
  H. Kiyama, T. Nakajima, S. Teraoka, A. Oiwa, and S. Tarucha
  Physical Review Letters 117, 236802 (2016)
• Signatures of Hyperfine, Spin-Orbit, and Decoherence Effects in a Pauli Spin Blockade
  T. Fujita, P. Stano, G. Allison, K. Morimoto, Y. Sato, M. Larsson, J.-H. Park, A. Ludwig, A. D. Wieck, A. Oiwa, and S. Tarucha
  Physical Review Letters 117, 206802 (2016)
• Growth evolution of γ'-Fe4N films on GaN(0001) and their interfacial structure
  M. Kimura and S. Hasegawa
  Japanese Journal of Applied Physics 55, 05FD02 (2016)
• Structural and magnetic characterization of Sm-doped GaN grown by plasma-assisted molecular beam epitaxy
  K. Dehara, Y. Miyazaki, and S. Hasegawa
  Japanese Journal of Applied Physics 55, 05FE03 (2016)
• Fluorescence Extended X-Ray Absorption Fine Structure Study on Local Structures of Rare-Earth-Doped InGaGdN
  S. N. M. Tawil, S. Emura, D. Krishnamurthy, and H. Asahi
  Advanced Materials Research 1133, 429-433 (2016)
• 4π-periodic Josephson supercurrent in HgTe-based topological Josephson junctions
  J. Wiedenmann, E. Bocquillon, R. S. Deacon, S. Hartinger, O. Herrmann, T. M. Klapwijk, L. Maier, C. Ames, C. Brüne, C. Gould, A. Oiwa, K. Ishibashi, S. Tarucha, H. Buhmann, and L. W. Molenkamp
  Nature communications 7, 10303 (2016)

2015

• Hall resistivity and transverse magnetoresistivity generated in simultaneous presence of spinpolarized current and external magnetic field in a nonmagnetic bipolar conductor YH2
  M. Sakai, H. Takao, T. Matsunaga, Y. Tanaka, T. Arai, S. Haruyama, T. Otomo, H. Hirama, T. Sakuraba, Z. Honda, K. Higuchi, A. Kitajima, A. Oshima, S. Hasegawa, and H. Awano
  Japanese Journal of Applied Physics 54, 013001 (2015)
• Electron states of uniaxially strained graphene
  H. Shioya, S. Russo, M. Yamamoto, M. F. Craciun, and S. Tarucha
  Nano Letters 15, 7943-7948 (2015)
• Raising the metal-insulator transition temperature of VO2 thin films by surface adsorption of organic polar molecules
  H. Shioya, Y. Shoji, N. Seiki, M. Nakano, T. Fukushima, and Y. Iwasa
  Applied Physics Express 8, 121101 (2015)
• Superconducting transport in single and parallel double InAs quantum dot Josephson junctions with Nb-based superconducting electrodes
  S. Baba, J. Sailer, R. S. Deacon, A. Oiwa, K. Shibata, K. Hirakawa, and S. Tarucha
  Appl. Phys. Lett. 107, 222602 (2015)
• 単一光子と単一電子の光学的スピン変換
  藤田高史、大岩顕、樽茶清悟
  固体物理 50, No. 11 (2015)
• Cooper pair splitting in parallel quantum dot Josephson junctions
  R. S. Deacon, A. Oiwa, J. Sailer, S. Baba, Y. Kanai, K. Shibata, K. Hirakawa, and S. Tarucha
  Nature Communications 6, 7446 (2015)
• Spin-dependent current through a quantum dot from spin-polarized nonequilibrium quantum Hall edge channels
  H. Kiyama, T. Nakajima, S. Teraoka, A. Oiwa, and S. Tarucha
  Phys. Rev. B 91, 155302 (2015)
• Photoluminescence related to Gd3+:N-vacancy complex in GaN:Gd multi-quantum wells
  M. Almokhtar, S. Emura, A. Koide, T. Fujikawa, and H. Asahi
  J. Alloys Comp. 628, 401-406 (2015)
• Importance of structural distortions in enhancement of transition temperature in FeSe1−xTex superconductors
  Kapil E. Ingle, K. R. Priolkar, Anand Pal, Rayees A. Zargar, V. P. S. Awana and S. Emura
  Supercond. Sci. Technol. 28, 015015 (2015)

2014

• Structural and defect characterization of Gd-doped GaN films by X-ray diffraction and positron annihilation
  A. Yabuuchi, N. Oshima, B. E. O'Rourke, R. Suzuki, K. Ito, S. Sano, K. Higashi, Y.-K. Zhou, and S. Hasegawa
  Journal of Physics: Conference Series 505, 012023 (2014)
• Local Structural Distortions and Their Role in Superconductivity in SmFeAsO1−xFx Superconductors
  K. Ingle, K. R. Priolkar, A. Pal, V. P. S. Awana, and S. Emura
  Superconductor Science and Technology 27, 075010 (2014)
• XAFS Studies of Diluted Magnetic Semiconductor Mn-doped ZnSnAs2 Thin Films on InP Substrates
  H. Oomae, H. Toyota, S. Emura, H. Asahi, and N. Uchitomi
  EPJ Web of Conferences 75, 09004 (2014)
• Ferromagnetic interactions and martensitic transformation in Fe doped Ni-Mn-In shape memory alloys
  D. N. Lobo, K. R. Priolkar, S. Emura, and A. K. Nigam
  Journal of Applied Physics 116, 183903 (2014)
• Tuning the electrically evaluated electron Landé g factor in GaAs quantum dots and quantum wells of different well widths
  G. Allison, T. Fujita, K. Morimoto, S. Teraoka, M. Larsson, H. Kiyama, A. Oiwa, S. Haffouz, D. G. Austing, A. Ludwig, A. D. Wieck, and S. Tarucha
  Phys. Rev. B 90, 235310 (2014)
• Single photoelectron detection after selective excitation of electron heavy-hole and electron light-hole pairs in double quantum dots
  K. Morimoto, T. Fujita, G. Allison, S. Teraoka, M. Larsson, H. Kiyama, S. Haffouz, D. G. Austing, A. Ludwig, A. D. Wieck, A. Oiwa, and S. Tarucha
  Phys. Rev. B 90, 085306 (2014)
• Electrically tunable spin filtering for electron tunneling between spin-resolved quantum Hall edge states and a quantum dot
  H. Kiyama, T. Fujita, S. Teraoka, A. Oiwa, and S. Tarucha
  Applied Physics Letters 104, 263101 (2014)