Zobrazeno 1 - 10
of 81
pro vyhledávání: '"Keisuke Shibuya"'
Autor:
Keisuke Shibuya, Akihito Sawa
Publikováno v:
AIP Advances, Vol 12, Iss 5, Pp 055103-055103-7 (2022)
We report the structural, electrical, and optical characterization of epitaxial niobium dioxide (NbO2) films fabricated on MgF2(001) substrates. The films were almost stoichiometric, had an indirect bandgap of 0.7 eV, and exhibited a phase transition
Externí odkaz:
https://doaj.org/article/9e9a67831af54e539fc4e0febf6fa2d8
Publikováno v:
Nature Communications, Vol 10, Iss 1, Pp 1-8 (2019)
Among its interesting properties, SrTiO3 can show both superconductivity and ferroelectric quantum criticality at low temperatures. Tomioka et al. use La and oxygen-isotope doping to tune electron-doped SrTiO3 to the critical region and observe enhan
Externí odkaz:
https://doaj.org/article/bda5d46a1b024c9f9c44dd6647ef9a5d
Autor:
Kenichi Miyazaki, Keisuke Shibuya, Megumi Suzuki, Kenichi Sakai, Jun-ichi Fujita, Akihito Sawa
Publikováno v:
AIP Advances, Vol 6, Iss 5, Pp 055012-055012-7 (2016)
We investigated the effects of chromium (Cr) and niobium (Nb) co-doping on the temperature coefficient of resistance (TCR) and the thermal hysteresis of the metal–insulator transition of vanadium dioxide (VO2) films. We determined the TCR and therm
Externí odkaz:
https://doaj.org/article/096028ff29aa41b09960a13241978566
Autor:
Keisuke Shibuya, Akihito Sawa
Publikováno v:
AIP Advances, Vol 5, Iss 10, Pp 107118-107118-10 (2015)
We systematically examined the effects of the substrate temperature (TS) and the oxygen pressure (PO2) on the structural and optical properties polycrystalline V O2 films grown directly on Si(100) substrates by pulsed-laser deposition. A rutile-type
Externí odkaz:
https://doaj.org/article/93716552431c418ca1d516f3e24764da
Publikováno v:
Bulletin of the Chemical Society of Japan; Mar2024, Vol. 97 Issue 3, p1-10, 10p
Autor:
Hidenori Tanaka, Melody Muguerza, Keisuke Shibuya, Takayasu Inoue, Yoshiyuki Nakamura, Kazuya Koga, Ryo Akashi, Masatsugu Hashiguchi
Publikováno v:
Asian Journal of Scientific Research. 13:156-163
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::97b8800d340553c9fe4c5929c1253efd
https://doi.org/10.3923/ajsr.2020.156.163
https://doi.org/10.3923/ajsr.2020.156.163
Publikováno v:
Journal of Structural and Construction Engineering (Transactions of AIJ). 84:301-310
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::bf35299faf111484d76504947eb91534
https://doi.org/10.3130/aijs.84.301
https://doi.org/10.3130/aijs.84.301
Autor:
Akihito Sawa, Keisuke Shibuya
Publikováno v:
AIP Advances. 12:055103
We report the structural, electrical, and optical characterization of epitaxial niobium dioxide (NbO2) films fabricated on MgF2(001) substrates. The films were almost stoichiometric, had an indirect bandgap of 0.7 eV, and exhibited a phase transition
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::17b0e079ad02a9c117933372c203ba55
https://doi.org/10.1063/5.0087610
https://doi.org/10.1063/5.0087610
Autor:
Masahiko Mori, Tomoya Yoshida, Akihito Sawa, Yuki Atsumi, Youichi Sakakibara, Keisuke Shibuya, Kiyo Ishii
Publikováno v:
Optics express. 28(25)
We investigated the switching dynamics of optical modulators consisting of a Si waveguide with a VO2 cladding layer by utilizing the photothermal effect, which induces a metal–insulator transition in VO2. The devices exhibited stable optical switch
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::08e225808ff1e9c368d935bd02952206
https://pubmed.ncbi.nlm.nih.gov/33379557
https://pubmed.ncbi.nlm.nih.gov/33379557
Publikováno v:
Proceedings of the International Conference on Strongly Correlated Electron Systems (SCES2019).
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::e95d9b0420dfe40bd67daf1ad39aca51
https://doi.org/10.7566/jpscp.30.011036
https://doi.org/10.7566/jpscp.30.011036