CVClient

有川 敬

アリカワ タカシ  (Takashi Arikawa)

基本情報

所属
兵庫県立大学 大学院 工学研究科 准教授
学位
博士(理学)(2009年5月 京都大学)

ORCID ID
 https://orcid.org/0000-0002-7330-2275
J-GLOBAL ID
201401045950404460
researchmap会員ID
7000009115

外部リンク

主要な論文

 42
  • Takashi Arikawa, Jaeyong Kim, Toshikazu Mukai, Naoki Nishigami, Masayuki Fujita, Tadao Nagatsuma, Koichiro Tanaka
    Nature Communications 15(1) 2024年7月2日  査読有り筆頭著者責任著者
    Abstract As a key component for next-generation wireless communications (6 G and beyond), terahertz (THz) electronic oscillators are being actively developed. Precise and dynamic phase control of ultrafast THz waveforms is essential for high-speed beam steering and high-capacity data transmission. However, measurement and control of such ultrafast dynamic process is beyond the scope of electronics due to the limited bandwidth of the electronic equipment. Here we surpass this limit by applying photonic technology. Using a femtosecond laser, we generate offset-free THz pulses to phase-lock the electronic oscillators based on resonant tunneling diode. This enables us to perform phase-resolved measurement of the emitted THz electric field waveform in time-domain with sub-cycle time resolution. Ultrafast dynamic response such as anti-phase locking behaviour is observed, which is distinct from in-phase stimulated emission observed in laser oscillators. We also show that the dynamics follows the universal synchronization theory for limit cycle oscillators. This provides a basic guideline for dynamic phase control of THz electronic oscillators, enabling many key performance indicators to be achieved in the new era of 6 G and beyond.
  • F. Blanchard, J. E. Nkeck, L. Guiramand, S. Zibod, K. Dolgaleva, T. Arikawa, K. Tanaka
    Optica 2022年9月20日  査読有り
  • Tomoki Hiraoka, Yuta Inose, Takashi Arikawa, Hiroshi Ito, Koichiro Tanaka
    Nature Communications 2022年6月29日  査読有り
  • Tomoki Hiraoka, Takashi Arikawa, Hiroaki Yasuda, Yuta Inose, Norihiko Sekine, Iwao Hosako, Hiroshi Ito, Koichiro Tanaka
    APL Photonics 2021年2月1日  査読有り
  • T. Arikawa, T. Hiraoka, S. Morimoto, F. Blanchard, S. Tani, T. Tanaka, K. Sakai, H. Kitajima, K. Sasaki, K. Tanaka
    Science Advances 6(24) 2020年6月12日  査読有り筆頭著者
  • T. Arikawa, K. Hyodo, Y. Kadoya, K. Tanaka
    Nature Physics 13(7) 688-692 2017年4月3日  査読有り筆頭著者責任著者
    An insulating bulk state is a prerequisite for the protection of topological edge states(1). In quantum Hall systems, the thermal excitation of delocalized electrons is the main route to breaking bulk insulation(2). In equilibrium, the only way to achieve a clear bulk gap is to use a high-quality crystal under high magnetic field at low temperature. However, bulk conduction could also be suppressed in a system driven out of equilibrium such that localized states in the Landau levels are selectively occupied. Here we report a transient suppression of bulk conduction induced by terahertz wave excitation between the Landau levels in a GaAs quantum Hall system. Strikingly, the Hall resistivity almost reaches the quantized value at a temperature where the exact quantization is normally disrupted by thermal fluctuations. The electron localization is realized by the long-range potential fluctuations, which are a unique and inherent feature of quantum Hall systems. Our results demonstrate a new means of effecting dynamical control of topology by manipulating bulk conduction using light.
  • T. Arikawa, X. Wang, D. J. Hilton, J. L. Reno, W. Pan, J. Kono
    Physical Review B 84(24) 2011年12月20日  査読有り筆頭著者
    We demonstrate coherent control of cyclotron resonance in a two-dimensional electron gas (2DEG). We use a sequence of terahertz (THz) pulses to control the amplitude of coherent cyclotron resonance oscillations in an arbitrary fashion via phase-dependent coherent interactions. We observe a self-interaction effect, where the 2DEG interacts with the THz field emitted by itself within the decoherence time, resulting in a revival and collapse of quantum coherence. These observations are accurately describable using single-particle optical Bloch equations, showing no signatures of electron-electron interactions, which verifies the validity of Kohn's theorem for cyclotron resonance in the coherent regime.

MISC

 11

書籍等出版物

 2

講演・口頭発表等

 108

共同研究・競争的資金等の研究課題

 11