Publication list

  before 2010

  2024
  1. Effects of electric field screening induced by photogenerated carriers on terahertz wave measurement
    in a GaAs epitaxial structure
    Takayuki Hasegawa and Osamu Kojima
    Applied Physics Express 17, pp. 051006-1--051006-4 (2023). [IOP]
  2023
  1. Quantum beat of heavy-hole and light-hole excitons originating from interband Stark-ladder transitions
    in a biased GaAs/AlAs superlattice
    Takayuki Hasegawa
    Applied Physics Express 16, pp. 021007-1--021007-4 (2023). [IOP]
  1. Control of electric field screening effects induced by photogenerated carriers for studies
    on ultrafast transient phenomena (in Japanese)
    Takayuki Hasegawa and Osamu Kojima
    Journal of the Japan Society of Infraed Science and Technology 32, pp. 52-57 (2023). [CiNii]
  2022
  1. Electric field dependence of terahertz wave emission in temperature-controlled GaAs epitaxial films
    2. Takayuki Hasegawa, Masaya Marui, and Yoshihito Tanaka
    Applied Physics Express 15, pp. 051001-1-051001-4 (2022). [IOP]
  2021
  1. Characteristics of terahertz wave emissions under the coexistence of different sub-picosecond transient phenomena
    in GaAs epitaxial films
    Takayuki Hasegawa, Yuta Okushima and Yoshihito Tanaka
    Applied Physics Express 14, pp. 041005-1--041005-4 (2021). [IOP]
  2019
  1. (Review) Characteristics of coherent optical phonons in a hexagonal YMnO3 thin film
    Takayuki Hasegawa
    Applied Sciences, Special issue: Photoinduced Cooperative Phenomena 9, 704-1--704-15 (2019). [MDPI]
  1. Photocurrent characteristics of nanostructured thin films consisting of surface-modified silicon nanoparticles
    Ryu-ichi Yoshikado, Takayuki Hasegawa, Yoshihito Tanaka, Shuhei Tsubota, and Seiichi Sato
    Journal of Physics: Conference Series, 1220, pp. 012048-1--012048-4 (2019).[IOP]
  1. Time-resolved optical spectroscopy of a GaAs single crystal irradiated by SR X-ray pulses
    Yoshihito Tanaka, Maki Nagashima, Kenta Tanaka, Takayuki Hasegawa, Yoshimitsu Fukuyama, and Nobuhiro Yasuda
    AIP Conference Proceedings 2054, pp. 040009-1--040009-4 (2019). [AIP]
  2017
  1. Ultrafast dynamics of coherent optical phonon correlated with the antiferromagnetic transition in
    a hexagonal YMnO3 epitaxial film
    Takayuki Hasegawa Norifumu Fujimura, and Masaaki Nakayama
    Applied Physics Letters 111, pp. 192901-1--192901-5 (2017). [AIP]
  2016
  1. Unique characteristics of nonequilibrium carrier transport dynamics in an undoped GaAs/n-type GaAs
    epitaxial structure
    Takayuki Hasegawa and Masaaki Nakayama
    Applied Physics Express 9, pp. 071001-1--071001-4 (2016). [IOP]
  1. X-Ray Beam Transfer between Hollow Fibers for Long-Distance Transport
    Yoshihito Tanaka, Rryuki Matsushita, Ryutaro Shiraishi, Takayuki Hasegawa, Kiyoshi Ishikawa, Kei Sawada,
    Yoshiki Kohmura, and Isao Takahashi
    AIP Conference Proceedings, 1741 040029-1--040029-4 (2016). [AIP]
  2014
  1. High-sensitivity polarization modulation reflectance spectroscopy of cavity polaritons in a ZnO microcavity
    Takayuki Hasegawa, Ryo Kishimoto, Yoshihiro Takagi, Toshiki Kawase, DaeGwi Kim, and Masaaki Nakayama
    Applied Physics Express 7, pp. 032003-1--032003-4 (2014). [IOP]
  2013
  1. Characteristics of ultrafast optical responses originating from non-equilibrium carrier transport in
    undoped GaAs/n-type GaAs epitaxial structures
    Takayuki Hasegawa, Yoshihiro Takagi, Hideo Takeuchi, Hisashi Yamada, Masahiko Hata, and Masaaki Nakayama
    Journal of Applied Physics 113, pp. 203506-1--203506-6 (2013). [AIP]

  2. Photoluminescence dynamics of excitons at the mini-Brillouin-zone edge in a GaAs/AlAs superlattice
    Masaaki Nakayama, Tomoya Yamashita, and Takayuki Hasegawa
    Journal of Crystal Growth 378, pp. 61-64 (2013). [Elsevier]
  2012
  1. Non-degenerated photoluminescence excitation correlation spectroscopy using an optical sampling technique
    Takayuki Hasegawa, Naofumi Masumoto, Tomonori Harada, Takayuki Makino, and Yoshihiro Takagi
    Review of Scientific Instruments 83, pp. 103108-1--103108-5 (2012). [AIP]

  2. Ultrafast optical response originating from carrier-transport processes in undoped GaAs/n-type GaAs epitaxial structures
    Takayuki Hasegawa, Yoshihiro Takagi, Hideo Takeuchi, Hisashi Yamada, Masahiko Hata, and Masaaki Nakayama
    Applied Physics Letters 100, pp. 211902-1--211902-4 (2012). [AIP]
    *Selected for Virtual Journal of Ultrafast Science, 11, issue 6 (2012).

  3. Frequency-tunable quantum beats under a Franz-Keldysh oscillation condition in a GaAs/AlxGa1-xAs superlattice
    Takayuki Hasegawa, Yoshihiro Takagi, and Masaaki Nakayama
    Applied Physics Express 5, pp. 041202-1--041202-3 (2012). [JSAP]
  2011
  1. Electric field effects on excitonic quantum beats in a single quantum well embedded in a GaAs/AlAs superlattice
    Takayuki Hasegawa, Yoshihiro Takagi, and Masaaki Nakayama
    Physical Review B 83, pp. 205309-1--205309-6 (2011). [APS]
    *Selected for Virtual Journal of Ultrafast Science, 10, issue 6 (2011).
  2010
  1. Upconversion of photoluminescence due to subband resonances in a GaAs/AlAs multiple quantum well structure
    Takayuki Hasegawa, Satoshi Okamoto, and Masaaki Nakayama
    Physica E 42, pp. 2648-2651 (2010). [Elsevier]

  2. Photoluminescence properties of exciton-exciton scattering in a GaAs/AlAs multiple quantum well
    Masaaki Nakayama, Takeyoshi Hirao, and Takayuki Hasegawa
    Physica E 42, pp. 2644-2647 (2010). [Elsevier]
  2009
  1. Pump-energy dependence of usual and unusual Bloch oscillations in a GaAs/AlAs superlattice
    Takayuki Hasegawa, Kohji Mizoguchi, and Masaaki Nakayama
    Physica Status Solidi (c) 6, pp. 264-267 (2009). [Wiley]

  2. Characteristics of photoluminescence due to exciton-exciton scattering in GaAs/AlAs multiple quantum wells
    Masaaki Nakayama, Takeyoshi Hirao, and Takayuki Hasegawa
    Journal of Applied Physics 105, pp. 123525-1--123525-5 (2009). [AIP]

  3. Intense emission of terahertz electromagnetic wave from an undoped GaAs/n-type GaAs epitaxial layer structure
    Hideo takeuchi, Junichi yanagisawa, Takayuki Hasegawa, Masaaki Nakayama
    Physica Status Solidi (c) 6, pp. 1513-1516 (2009). [Wiley]
  2008
  1. Excitonic quantum beat at the mini-Brillouin-zone boundary in a GaAs/AlAs superlattice
    Takayuki Hasegawa, Kohji Mizoguchi, and Masaaki Nakayama
    Journal of Luminescence 128, pp. 1056-1058 (2008). [Elsevier]

  2. Enhancement of terahertz electromagnetic wave emission from an undoped GaAs/n-type GaAs
    epitaxial layer structure
    Hideo Takeuchi, Junichi Yanagisawa, Takayuki Hasegawa, and Masaaki Nakayama
    Applied Physics Letters 93, pp. 081916-1--081916-3 (2008). [AIP]

  3. Photoluminescence due to exciton-exciton scattering in a GaAs/AlAs multiple quantum well
    Takeyoshi Hirao, Takayuki Hasegawa, and Masaaki Nakayama
    Journal of Luminescence 128, pp. 960-962 (2008). [Elsevier]
  2007
  1. Transformation process from quantum beats of miniband excitons to Bloch oscillations
    in a GaAs/AlAs superlattice under applied electric fields
    Takayuki Hasegawa, Kohji Mizoguchi, and Masaaki Nakayama
    Physical Review B 76, pp. 115323-1--115323-6 (2007). [APS]
    *Selected for Virtual Journal of Ultrafast Science, 6, issue 10 (2007).

  2. Photocurrent bistability in a GaAs/AlxGa1-xAs superlattice under resonant-coupling conditions
    of Wannier-Stark-localization states
    Takayuki Hasegawa and Masaaki Nakayama
    Journal of Applied Physics 101, pp. 043512-1--043512-5 (2007). [AIP]
  2006
  1. Photoluminescence from excitons at the mini-Brillouin-zone boundary in a GaAs/AlAs superlattice
    Takayuki Hasegawa and Masaaki Nakayama
    Physica Status Solidi (b) 243, pp. 3825-3828 (2006). [Wiley]
  2005
  1. Electroreflectance observation of transformation processes of the first and second minibands
    to Wannier-Stark localization states in a GaAs/AlAs superlattice
    Takayuki Hasegawa and Masaaki Nakayama
    Japanese Journal of Applied Physics 44, pp. 8340-8344 (2005). [IOP]

  2. Correlation between PL emission band and growth of oxide layer on surface of silicon nanocrystallites
    Ikurou Umezu, Motohiko Koyama, Takayuki Hasegawa, Kimihisa Matsumoto, Mitsuru Inada, and Akira Sugimura
    AIP conference Proceedings 772, pp. 855-856 (2005). [AIP]