Publications

  1. Takeshi Ota, Kenichi Hitachi,Koji Muraki,and Toshimasa Fujisawa
    "Dissipative Landau–Zener transition in double quantum dot under sinusoidal potential modulation"
    Appl. Phys. Exp. 10 (2017) 115201 (Selected as "Spotlights")
  2. Kenichi Hitachi, Takeshi Ota,and Koji Muraki
    "Intrinsic and extrinsic origins of low-frequency noise in GaAs/AlGaAs Schottky-gated nanostructures"
    Appl. Phys. Lett. 102 (2013) 192104
  3. K. Yamada, M. Stopa, T. Hatano, T. Yamaguchi, T. Ota, Y. Tokura, and S. Tarucha
    "Geometric blockade in a quantum dot coupled to two-dimensional and three-dimensional electron gases"
    Phys. Rev. B (RC) 84 (2011) 201303
  4. Takashi Kobayashi, Norio Kumada, Takeshi Ota, Satoshi Sasaki, and Yoshiro Hirayama
    "Low-frequency spin fluctuations in skyrmions confined by wires: Measurements of local nuclear spin relaxation"
    Phys. Rev. Lett. 107 (2011) 126807
  5. T. Fujisawa, G. Shinkai, T. Hayashi, and T. Ota
    "Multiple two-qubit operations for a coupled semiconductor charge qubit"
    Physica E 43 (2011) 730
  6. Takeshi Ota
    "Semiconductor Quantum Bit Achieves 2-qubit Operations" (in Japanese)
    Business Communication 5 (2010) 24
  7. H. Kamata, T. Ota, K. Muraki, and T. Fujisawa
    "Voltage-controlled group velocity of edge magnetoplasmon in the quantum Hall regime"
    Phys. Rev. B 81 (2010) 085329
  8. T. Ota, , T. Hayashi, K. Muraki, and T. Fujisawa
    "Wide-band capacitance measurement on a semiconductor double quantum dot for studying tunneling dynamics"
    Appl. Phys. Lett. 96 (2010) 032104
  9. G. Shinkai, T. Hayashi, T. Ota, K. Muraki, and T. Fujisawa
    "Bidirectional current drag induced ny two-electron cotunneling in coupled quantum dots"
    Appl. Phys. Exp. 2 (2009) 081101
  10. G. Shinkai, T. Hayashi, T. Ota, and T. Fujisawa
    "Correlated coherent oscillations in coupled semiconductor charge qubits"
    Phys. Rev. Lett. 103 (2009) 056802
  11. Y. Hirayama, G. Yusa, K. Hashimoto, N. Kumada, T. Ota, and K. Muraki
    "Electron-spin / nuclear-spin interactions and NMR in semiconductors"
    Semicond. Sci. Technol. 24 (2009) 023001
  12. H. Kamata, Takeshi Ota, and Toshimasa Fujisawa
    "Correlation measurement of time-dependent potential in a semiconductor quantum point contact"
    Jpn. J. Appl. Phys. 48 (2009) 04C149
  13. Zhenzhong Wang, Dongmin Chen, Takeshi Ota, and Toshimasa Fujisawa
    "Time –dependent local potential induced by scanning gate microscopy"
    Jpn. J. Appl. Phys. 48 (2009) 04C148
  14. T. Kobayashi, N. Kumada, T. Ota, S. Sasaki, and Y. Hirayama
    "Selective polarization of nuclear spins in a wire-like quantum Hall system"
    AIP conference proceedings 1194 (2010) 241
  15. Norio Kumada, Takeshi Ota, and Koji Muraki
    "Nuclear-spin-based Quantum Information Devices in Solid-State Nanometer-Scale Structures"
    NTT Technical Review January 6 (2008) 1
  16. V. T. Renard, T. Ota, N. Kumada, and Y. Hirayama
    "Positive magneto-resistance in a point contact: possible manifestation of interactions"
    International Journal of High Speed Electronics and Systems 17 (2007) 495
  17. V. T. Renard, O. A. Tkachenko, V. A. Tkachenko, T. Ota, N. Kumada, J-C Portal, and Y. Hirayama
    "Boundary-mediated electron-electron interactions in quantum point contacts"
    Phys. Rev. Lett. 100 (2008) 186801
  18. T. Ota, , N. Kumada, G. Yusa, S. Miyashita, T. Fujisawa, and Y. Hirayama
    "Decoherence of nuclear spins in a GaAs quantum well probed by a submicron-scale all-electrical NMR device"
    Jpn. J. Appl. Phys. 47 (2008) 3115
  19. V. T. Renard, O.A. Tkachenko, V.A. Tkachenko, T. Ota, N. Kumada, J.C. Portal, and Y. Hirayama
    "Electron-electron interactions in clean quantum point contacts in the large conductance regime"
    Physica E 40 (2008) 1684
  20. T. Ota, , G. Yusa, N. Kumada, S. Miyashita, T. Fujisawa, and Y. Hirayama
    "Decoherence of nuclear spins due to dipole-dipole interactions probed by resistively detected nuclear magnetic resonance"
    Appl. Phys. Lett. 91 (2007) 193101
  21. T. Ota, , G. Yusa, N. Kumada, S. Miyashita, T. Fujisawa, and Y. Hirayama
    "Initialization and logic gate operations of nuclear spin qubits using a submicron scale resistively-detected NMR device"
    Phys. Stat. Solidi (c) 5 (2008) 306
  22. K. Takashina, M. Brun, T. Ota, D.K. Maude, A. Fujiwara, Y. Ono, H. Inokawa, and Y. Hirayama
    "Anormalous resistance ridges along filling factor v=4i"
    Phys. Rev. Lett. 99 (2007) 036803
  23. K. Takashina, M. Brun, T. Ota, D.K. Maude, A. Fujiwara, Y. Ono, H. Inokawa, and Y. Hirayama
    "Resistance ridges along filling factor v=4i in SiO2/Si/SiO2 quantum wells"
    AIP Conference proceedings 893(2007) 625
  24. S. K. Ozdemir, A. Miranowicz, T. Ota, G. Yusa, N. Imoto, and Y. Hirayama
    "Nuclear spins in a nanoscale device for quantum information processing"
    e-J. Surf. Sci. Nanotech. 4 (2006) 669 (quant-ph/0612228)
  25. K. Takashina, M. Brun, T. Ota, D.K. Maude, A. Fujiwara, Y. Ono, H. Inokawa, and Y. Hirayama
    "Resistance ridges along filling factor v=4i in SiO2/Si/SiO2 quantum wells"
    Conference proceedings of ICPS28, p625 (2007)
  26. T. Ota, G. Yusa, N. Kumada, S. Miyashita, and Y. Hirayama
    "Nuclear spin polarization and its control toward initialization using all-electrical sub-micron scale GaAs NMR device"
    Appl. Phys. Lett. 90 (2007) 102118 (cond-mat/0702086)
  27. V. T. Renard, T. Ota, N. Kumada, S. Miyashita, and Y. Hirayama
    "Positive magneto-resistance in a point contact: possible manifestation of interactions"
    Physics and Modeling of Tera- and Nano-Devices, ed. by Maxim Ryzhii, Victor Ryzhii, (World Scientific Publishing Co. Pte. Ltd.)
  28. T. Ota, N. Kumada, G. Yusa, S. Miyashita, and Y. Hirayama
    "Study of nuclear quadrupolar interaction using a novel all-electrical GaAs NMR device"
    Phys. Stat. Solidi (c) 4 (2007) 1759
  29. Takeshi Ota, and Seigo Tarucha
    "Single electron tunneling spectroscopy in weakly coupled self-assembled InAs quantum dots" (in Japanese)
    Kotai Butsuri 41 (2006) 33
  30. Y. Hirayama, A. Miranowicz, T. Ota, G. Yusa, K. Muraki, S.K. Ozdemir, and N. Imoto
    "Nanometre-scale nuclear-spin device for quantum information processing"
    J. Phys. Condens. Matter 18 (2006) S885-S900
  31. T. Ota, M. Rontani, S. Tarucha, Y. Nakata, H.Z. Song, T. Miyazawa, T. Usuki, M. Takatsu, and N. Yokoyama
    "Few-electron molecular states and their transitions in a single InAs quantum dot molecule"
    Phys. Rev. Lett. 95 (2005) 236801 (cond-mat/0510213)
  32. K. Yamada, M. Stopa, Y. Tokura, T. Hatano, T. Ota, T. Yamaguchi, and S. Tarucha
    "Tunnel-coupling blockade in vertical/lateral hybrid dot to study many-body states for electron number N=1,2 and 3"
    AIP Conference Proceedings, 772 (2005) 785
  33. T. Ota, M. Stopa, M. Rontani, T. Hatano, K. Yamada, S. Tarucha, Y. Nakata, H.Z. Song, T. Miyazawa, T. Usuki, M. Takatsu, and N. Yokoyama
    "Spin states in a single InAs quantum dot molecule probed by single-electron tunneling spectroscopy"
    AIP Conference Proceedings, 772 (2005) 643
  34. T. Hatano, M. Stopa, T. Yamaguchi, T. Ota, K. Yamada, and S. Tarucha
    "Electron-spin and electron-orbital dependence of the tunnel coupling in laterally coupled double vertical dots"
    Phys. Rev. Lett. 93 (2004) 066806
  35. T. Ota, K. Ono, M. Stopa, T. Hatano, S. Tarucha, H. Z. Song, Y. Nakata, T. Miyazawa, T. Ohshima, and N. Yokoyama
    "Single-dot spectroscopy via elastic single-electron tunneling through a pair of coupled quantum dots"
    Phys. Rev. Lett. 93 (2004) 066801 (cond-mat/0405545)
  36. M. Stopa, Tsuyoshi Hatano, Takeshi Ota, Kazumasa Yamada, and Seigo Tarucha
    "A bond bending model for negative differential resistance in transport through single molecules"
    Superlattices and Microstructures 34 (2003) 439
  37. Y. Yamada, M. Stopa, T. Hatano, T. Ota, T. Yamaguchi, and S. Tarucha
    "Co-tunneling through a quantum dot between a 2D and a 3D electron gas: excited states and tunneling asymmetry effects"
    Superlattices and Microstructures 34 (2003) 185
  38. Tsuyoshi Hatano, Michael Stopa, Takeshi Ota, Kazumasa Yamada, Tomohiro Yamaguchi, and Seigo Tarucha
    "Delocalization energy probed by asymmetry of Coulomb diamond in double dot system"
    Superlattices and Microstructures 34 (2003) 195
  39. T. Ota, M. Stopa, T. Hatano, K. Yamada, S. Tarucha, H. Z. Song, Y. Nakata, T. Miyazawa, T. Ohshima, and N. Yokoyama
    "Molecular states observed in a single pair of strongly coupled self-assembled InAs quantum dots"
    Superlattices and Microstructures 34 (2003) 159 (cond-mat/0401576)
  40. Tsuyoshi Hatano, Michael Stopa, Wataru Izumida, Tomohiro Yamaguchi, Takeshi Ota, and Seigo Tarucha
    "Gate-voltage dependence of inter dot coupling and Aharanov-Bohm oscillation in laterally coupled vertical double dot"
    Physica E 22 (2004) 534
  41. T. Ota, T. Hatano, K. Ono, S. Tarucha, H. Z. Song, Y. Nakata, T. Miyazawa, T. Ohshima, and N. Yokoyama
    "Single electron spectroscopy in a single pair of weakly coupled self-assembled InAs quantum dots"
    Physica E 22 (2004) 510
  42. T. Ota, T. Hatano, S. Tarucha, H. Z. Song, T. Nakata, T. Miyazawa, T. Ohshima, and N. Yokoyama
    "Transport properties of a single pair of coupled self-assembled InAs quantum dots"
    Physica E 19 (2003) 210
  43. M. Ando, T.J. Inagaki, Y. Kanemitsu, T. Kushida, K. Maehashi, Y. Murase, T. Ota, and H. Nakashima
    "Photoluminescence properties of highly excited CdSe quantum dots"
    Journal of Luminescence 94-95 (2001) 403-406
  44. Takeshi Ota, Shigehiko Sasa, Yoshiyuki Harada, and Satoshi Hashimoto
    "Optical properties of single micron-sized ZnO particles embedded in alkali halide crystals studied by cathodoluminescence"
    Physica Status Solidi (b) 229 (2002) 815-818
  45. Takeshi Ota, Kenzo Maehashi, J. Christen, Kenichi Oto, Kazuo Murase, and Hisao Nakashima
    "Single quantum wire spectroscopy using (Al, Ga) As quantum wire grown on vicinal GaAs (110) surfaces"
    Physica E 11 (2001) 228-232
  46. Kenzo Maehashi, Nobuhiro Yasui, Takeshi Ota, Tuguki Noma Yasuhiro Murase, and Hisao Nakashima
    "Structural and Optical Properties of CdSe/ZnSe Self-Organized Quantum Dots"
    Journal Crystal Growth 227-228 (2001) 1116-1120
  47. Takeshi Ota, Yutaka Inoue, Masataka Minami, Kenzo Maehashi, Hisao Nakashima,Chikara Watatani, Keiichi Edamatsu, and Tadashi Itoh
    "The carrier dynamics in single layer and stacked GaAs quantum wires formed on vicinal GaAs (110) substrates studied by time-resolved photoluminescence"
    Proceedings of 25th International Conference on the Physics of Semiconductors (2000), Osaka, Japan, 1325-1326
  48. Takeshi Ota, Kenzo Maehashi, Hisao Nakashima, Kenichi Oto, and Kazuo Murase
    "Photodegradation of CdSe quantum dots studied by micro-photoluminescence spectroscopy"
    Physica Status Solidi (b) 224 (2001) 169-172
  49. Takeshi Ota, Yasuhiro Murase, Kenzo Maehashi, Hisao Nakashima, Chikara Watatani, Keiichi Edamatsu , Tadashi Itoh, Kenichi Oto, and Kazuo Murase
    "Investigation of carrier relaxation dynamics in single CdSe/ZnSe self-organized quantum dot by time-resolved micro-photoluminescence"
    Journal of Electronic Materials 30 (2001) 448-452
  50. Kenzo Maehashi, Nobuhiro Yasui, Yasuhiro Murase, Takeshi Ota, Tuguki Noma, and Hisao Nakashima
    "Formation and Characterization of Self-Organized CdSe Quantum Dots"
    Journal of Electronic Materials 29 (2000) 542-548
  51. Yasuhiro Murase, Nobuhiro Yasui, Takeshi Ota, Akihiro Shikimi, Tsuguki Noma, Kenzo Maehashi, and Hisao Nakashima
    "Temperature dependence of photoluminescence spectra in self-organized CdSe quantum dots"
    Journal of Crystal Growth 214-215 (2000) 770-773
  52. Takeshi Ota, Tsuguki Noma, Yasuhiro Murase, Kenzo Maehashi, Hisao Nakashima, Kenichi Oto, and Kazuo Murase
    "Micro-photoluminescence from CdSe quantum dots"
    Journal of Crystal Growth 214-215 (2000) 778-781
  53. Kenzo Maehashi, Keisuke Kobayashi, Takeshi Ota, Hisao Nakashima, Yoichi Ishiwata, and Shik Shin
    "Photoluminescence Core-Level Excitation of CdSe Quantum Dot Structures"
    Journal of Crystal Growth 214-215 (2000) 752-755
  54. Byoung-Rho Shim, Kazuki Bando, Takeshi Ota, Keisuke Kobayashi, and Hisao Nakashima
    "Size and compositional dependence of photoluminescence from InXGa1-XAs quantum wires"
    Proceedings of 11th International Conference on Indium Phosphide and Related Materials 1999, Davos, Switzerland
  55. Keisuke Kobayashi, Takeshi Ota, Kenzo Maehashi, Hisao Nakashima, Yoichi Ishiwata, and Shik Shim
    "Photoluminescence Core-Level Excitation of Semiconductor Quantum Structures"
    Physica E 7 (2000) 595-599
  56. Kazuki Bando, Satoshi Torii, Byoung-Ryo Shim, Takeshi Ota, Kenzo Maehashi, Keisuke Kobayashi, and Hisao Nakashima
    "Photoluminescence of InAs Quantum Wires on Vicinal GaAs(110) Substrates"
    Microelectronic engineering 47 (1999) 163
  57. Takehiro Nishida, Kenzo Maehashi, Takeshi Ota, Keisuke Kobayashi, and Hisao Nakashima
    "Photoluminescence of modulation doped GaAs quantum wires on vicinal GaAs (110) substrates"
    Microelectronic engineering 47 (1999) 171
  58. Byoung-Ryo Sim, Satoshi Torii, Takeshi Ota, Keisuke Kobayashi, Kenzo Maehashi, Hisao Nakashima, and Sang-Yun Lee
    "Transmission Electron Microscopy and Photoluminescence Characterization of InGaAs Strained Quantum Wires on GaAs Vicinal (110) Substrates"
    Journal of the Korean physical Society 35 (1999) 559
  59. Satoshi Torii, Byoung-Rho Shim, Takeshi Ota, Keisuke Kobayashi, and Hisao Nakashima
    "Strongly Polarized Photoluminescence from InAs Quantum Wires on Vicinal (110) Surfaces"
    Proceedings of 24th International Conference on the Physics of Semiconductors (1998), Jerusalem, Israel
  60. Byoung-Rho Shim, Satoshi Torii, Takeshi Ota, Keisuke Kobayashi, Kenzo Maehashi, Shigehiko Hasegawa, Koichi Inoue, and Hisao Nakashima
    "Formation of InGaAs Strained Quantum Wires on GaAs(110) Vicinal Substrates by MBE"
    Solid-state Electronics 42 (1998) 1609
  61. Keisuke Kobayashi, Takeshi Ota, Hisao Nakashima, Yoichi Ishiwata, Tohru Higuchi, and Shik Shin
    "Photoluminescence of AlGaAs-GaAs-AlGaAs Quantum Structures under Al 2p Core Excitation"
    ISSP Activity Report of Synchrotron Radiation Laboratory, 1997/1998, 48
  62. Kenzo Maehashi, Keisuke Kobayashi, Takeshi Ota, Hisao Nakashima, Yoichi Ishiwata, and Shik Shin
    "New Method of Photoluminescence Measurements by Exciting Core Levels using Synchrotron Radiation"
    ISSP Activity Report of Synchrotron Radiation Laboratory, 1997/1998, 50
  63. Jun Ushida, Takeshi Ota, and Kikuo Cho
    "Radiative Lifetime of an Atom In- and Outside of planar / Spherical Dielectrics"
    Journal of Physical Society of Japan 68 (1998) 2439
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