last update: Apr. 30, 2017


    湯川 龍 (YUKAWA, Ryu) 
 博士(理学)

 高エネルギー加速器研究機構 物質構造科学研究所 
 放射光科学第一研究系 博士研究員

 [Contact]
 〒305-0801 
 茨城県つくば市大穂1-1 KEK-PF内 組頭研究室 A108
 Phone & Fax: 029-864-5586
 PHS: 029-864-5200 音声案内後 4810
 E-mail : ryukawa<at>post.kek.jp


学歴

 2010年 3月 東京理科大学 理学部 物理学科 卒業  
 2012年 3月 東京大学 大学院理学研究科 物理科学専攻 修士課程 修了 
修士論文:  遷移金属酸化物の表面金属化 
(

Surface metallization of transition metal oxide

)

 2015年 3月 東京大学 大学院理学研究科 物理科学専攻 博士課程 修了
博士論文:  金属酸化物の表面電子構造と表面におけるキャリアダイナミクス
(

Electronic Structures and Carrier Dynamics at Metal Oxide Surfaces

)


2012年 4月 ~ 2015年 3月 フォトンサイエンス・リーディング大学院 (ALPS)


職歴

2015年 4月〜(現在) 高エネルギー加速器研究機構 物質構造科学研究所 博士研究員 


業績リスト

[原著論文] (Total: 27, 1st author: 5)


[Submitted]

 2. K. Horiba, R. Yukawa, T. Mitsuhashi, M. Kitamura, T. Inoshita, N. Hamada, S. Otani, N. Ohashi, S. Maki, J. Yamaura, H. Hosono, Y. Murakami, and H. Kumigashira,
“Semimetallic "Electride Bands" Derived from Interlayer Electrons in Quasi-Two-Dimensional Electride Y2C”,
1-5, arXiv:1606.01174 (2016).
 
 1.  K. Yaji, R. Yukawa, S. Kim, Y. Ohtsubo, P. Le Fèvre, F. Bertran, A. Taleb-Ibrahimi, I. Matsuda, K. Nakatsuji, and F. Komori,
“Deviation from Fermi-liquid behavior in two-dimensional surface states of Au-induced nanowires on Ge(001) by correlation and localization”,
1-5,arXiv:1602.05284 (2016). 

[2017]

 25.K. Hagiwara, Y. Takeno, Y. Ohtsubo, R. Yukawa, M. Kobayashi, K. Horiba, H. Kumigashira, J. Rault, P. Le Fèvre, F. Bertran, A. Taleb-Ibrahimi, F. Iga, S. Kimurao, 
“Temperature dependence of Yb valence in the sub-surface of YbB
12(001)”
J. Phys.: Conf. Ser. 807, 012003--1-5 (2017).

 24.B. Feng, O. Sugino, R.-Y. Liu, J. Zhang, R. Yukawa, M. Kawamura, T. Iimori, H. Kim, Y. Hasegawa, H. Li, L. Chen, K. Wu, H. Kumigashira, F. Komori, T.-C. Chiang, S. Meng, and I. Matsuda,
Dirac Fermions in Borophene”
Phys. Rev. Lett. 118, 96401--1-6 (2017). (Featured in Physics)

[2016]

 23. S. Backes, T. C. Rödel, F. Fortuna, E. Frantzeskakis, P. LeFèvre, F. Bertran, M. Kobayashi, R. Yukawa, T. Mitsuhashi, M. Kitamura, K. Horiba, H. Kumigashira, R. Saint-Martin, A. Fouchet, B. Berini, Y. Dumont, A. J. Kim, F. Lechermann, H. O. Jeschke, M. J. Rozenberg, R. Valentí, and A. F. Santander-Syro, 
“Hubbard band versus oxygen vacancy states in the correlated electron metal SrVO3
Phys. Rev. B 94, 241110--1-7 (2016)
(Editor's suggestion) 

 22. K. Ozawa, S. Yamamoto, R. Yukawa, R. Liu, M. Emori, K. Inoue, T. Higuchi, H. Sakama, K. Mase, and I. Matsuda,
What Determines the Lifetime of Photoexcited Carriers on TiO
2 Surfaces?,
J. Phys. Chem. C 120, 29283-29289 (2016).  

 21. R. Yukawa, S. Yamamoto, K. Akikubo, K. Ozawa, H. Kumigashira, and I. Matsuda,
“Tailoring Photovoltage Response at SrRuO3/SrTiO3 Heterostructures”,
Adv. Mater. Interfaces, 3, 1600527--1-5 (2016).
 
(Back Cover: Adv. Mater. Interfaces, Nov. 18, 2016)
(Press release: 日本経済新聞 電子版 2016年9月11日

 20. R. Yukawa, K. Ozawa, S. Yamamoto, H. Iwasawa, K. Shimada, E. F. Schwier, K. Yoshimatsu, H. Kumigashira, H. Namatame, M. Taniguchi, and I. Matsuda,
“Phonon-Dressed Two-Dimensional Carriers on the ZnO Surface”,
Phys.Rev. B 94, 165313—1-5 (2016).

 19.  T. Mitsuhashi, M. Minohara, R. Yukawa, M. Kitamura, K. Horiba, M. Kobayashi, and H. Kumigashira,
“Influence of k
broadening on ARPES spectra of the (110) and (001) surfaces of SrVO3 films”,
Phys. Rev. B 94, 125148—1-8(2016).

 18. K. Hagiwara, Y. Ohtsubo, M. Matsunami, S. Ideta, K. Tanaka, H. Miyazaki, J. E. Rault, P. Le Fèvre, F. Bertran, A. Taleb-Ibrahimi, R. Yukawa, M. Kobayashi, K. Horiba, H. Kumigashira, K. Sumida, T. Okuda, F. Iga, and S. Kimura,
“Surface Kondo effect and non-trivial metallic state of the Kondo insulator YbB12,
Nat. Commun. 7, 12690—1-7 (2016).
(Press release: 毎日新聞 2016年9月2日)

 17. J. Ren, L. Fu, G. Bian, J. Su, H. Zhang, S. Velury, R. Yukawa, L. Zhang, T. Wang, G. Zha, R. Guo, T. Miller, M. Z. Hasan, and T.-C. Chiang,
"An Effective Approach to Improving Cadmium Telluride (111)A Surface by Molecular-Beam-Epitaxy Growth of Tellurium Monolayer",
ACS Appl. Mater.Interfaces 8, 726-735 (2016).

 16. T. Abukawa, S. Yamamoto, R. Yukawa, S. Kanzaki, K. Mukojima, I.Matsuda,
“Time-resolved soft X-ray core-level photoemission spectroscopy to 880 °C using pulsed laser and synchrotron radiation, and switched heating current”,
Surf.Sci. 656, 43-47 (2016).

 15. K. Ozawa, S. Yamamoto, R. Yukawa, K. Akikubo, M. Emori, H. Sakama, and I. Matsuda,
“Capturing transiently charged states at the C60/TiO2(110) interface by time-resolved soft X-ray photoelectron spectroscopy”,
Org. Electron. 31, 98-103(2016).

 

[2015]

 14. R. Yukawa, K. Ozawa, S. Yamamoto, R.-Y. Liu, and I. Matsuda, 
“Anisotropic effective mass approximation model to calculate multiple subband structures at wide-gap semiconductor surfaces: Application to accumulation layers of SrTiO3 and ZnO”,
Surf. Sci. 641, 224-230 (2015).

 13. C.-Z. Xu, Y. Liu, R. Yukawa, L.-X. Zhang, I. Matsuda, T. Miller, and T.-C. Chiang,
“Photoemission Circular Dichroism and Spin Polarization of the Topological Surface States in Ultrathin Bi2Te3 Films”,
Phys. Rev. Lett. 115, 016801—1-5(2015).
(Editor's suggestion) 

 12. K. Yaji, Y. Ohtsubo, S. Hatta, H. Okuyama, R. Yukawa, I. Matsuda, P. Le Fèvre, F. Bertran, A. Taleb-Ibrahimi, A. Kakizaki, and T. Aruga,
“Experimental evidence for two-dimensional states localized in subsurface region of Ge(111)”,
J. Electron Spectros. Relat. Phenomena 201, 92-97 (2015).


[2014]

 11. R. Yukawa, S. Yamamoto, K. Ozawa, M. Emori, M. Ogawa, S. Yamamoto, K. Fujikawa, R. Hobara, S. Kitagawa, H. Daimon, H. Sakama, and I. Matsuda,
“Electron-hole recombination on ZnO(0001) single-crystal surface studied by time-resolved soft X-ray photoelectron spectroscopy”,
Appl. Phys. Lett.
105,151602—1-4 (2014).

 10. T. Someya, H. Fukidome, Y. Ishida, R. Yoshida, T. Iimori, R. Yukawa, K. Akikubo, S. Yamamoto, S. Yamamoto, T. Yamamoto, T. Kanai, K. Funakubo, M. Suemitsu, J. Itatani, F. Komori, S. Shin, and I. Matsuda,
“Observing hot carrier distribution in an n-type epitaxial graphene on a SiC substrate”,
Appl. Phys. Lett.
104, 161103--1-5 (2014).
(Press release: マイナビニュース 2014年5月29日、化学新聞 2014年6月13日)

 9. M. Ogawa, R.-Y. Liu, C.-H. Lin, S. Yamamoto, R. Yukawa, R. Hobara, S.-J. Tang, and I. Matsuda,
“Non-linear kinetic model for oscillatory relaxation of the photovoltage effect on a Si(111)7×7 surface”
Surf. Sci. 624, 70–75 (2014).

 8. Sh. Yamamoto, M. Taguchi, M. Fujisawa, R. Hobara, S. Yamamoto, K. Yaji, T. Nakamura, K. Fujikawa, R. Yukawa, T. Togashi, M. Yabashi, M. Tsunoda, S. Shin, and I. Matsuda, 
“Observation of a giant Kerr rotation in a ferromagnetic transition metal by M-edge resonant magneto-optic Kerr effect”,
Phys. Rev. B
89, 064423—1-6 (2014).

 7. K. Ozawa, M. Emori, S. Yamamoto, R. Yukawa, S. Yamamoto, R. Hobara, K. Fujikawa, H. Sakama, and I. Matsuda, 
“Electron–Hole Recombination Time at TiO2 Single-Crystal Surfaces: Influence of Surface Band Bending”,
J. Phys. Chem. Lett. 5, 1953-1957 (2014).
(Press release: マイナビニュース 2014年4月24日、財経新聞 2014年4月28日)


[2013]

 6. R. Yukawa, S. Yamamoto, K. Ozawa, M. D’Angelo, M. Ogawa, M. G. Silly, F. Sirotti, and I. Matsuda,
“Electronic structure of the hydrogen-adsorbed SrTiO3(001) surface studied by polarization-dependent photoemission spectroscopy”,
Phys. Rev. B 87,115314—1-6 (2013).

 5. M. Ogawa, S. Yamamoto, K. Fujikawa, R. Hobara, R. Yukawa, S. Yamamoto, S. Kitagawa, D. Pierucci, M. G. Silly, C.-H. Lin, R.-Y. Liu, H. Daimon, F. Sirotti, S.-J. Tang, and I. Matsuda,
“Relaxations of the surface photovoltage effect on the atomically controlled semiconductor surfaces studied by time-resolved photoemission spectroscopy”,
Phys. Rev. B
88, 165313—1-9 (2013).

 4. M. Ogawa, S. Yamamoto, R. Yukawa, R. Hobara, C.-H. Lin, R.-Y. Liu, S.-J. Tang, and I. Matsuda,
“Oscillatory relaxation of surface photovoltage on a silicon surface”
,
Phys. Rev. B 87, 235308--1-4 (2013).


[2012]

 3. M. D’Angelo, R. Yukawa, K. Ozawa, S. Yamamoto, T. Hirahara, S. Hasegawa, M. G. Silly, F. Sirotti, and I. Matsuda, 
“Hydrogen-Induced Surface Metallization of SrTiO3(001)”
Phys. Rev. Lett.
 108, 116802--1-5 (2012).

 2. Y. Fukaya, I. Matsuda, R. Yukawa, and A. Kawasuso,
“Stru
ctural analysis of Si(111)-√21×√21-(Ag, Cs) surface by reflection high-energy positron diffraction”
Surf. Sci. 
606,1918–1921 (2012).

 1. M. Ogawa, S. Yamamoto, Y. Kousa, F. Nakamura, R. Yukawa, A. Fukushima, A. Harasawa, H. Kondoh, Y. Tanaka, A. Kakizaki, and I. Matsuda,
“Development of soft x-ray time-resolved photoemission spectroscopy system with a two-dimensional angle-resolved time-of-flight analyzer at SPring-8 BL07LSU”,
Rev. Sci. Instrum. 83, 023109—1-7 (2012).

[国際会議発表] 

   
 8. R. Yukawa, M. Minohara, T. Mitsuhashi, M. Kitamura, M. Kobayashi, K. Horiba, and H. Kumigashira,
In situ angle-resolved photoemission study on K-adsorbed anatase TiO2 (001) surfaces”,
9th International conference on Vacuum Ultraviolet and X-ray Physics (VUVX2016), Zurich, Switzerland, Jul. 2016, Poster.

 7. R. Yukawa,
“Electron-Phonon Interactions in Two-Dimensional Electronic States at the H-dosed ZnO Surface”,
EMN Meeting on Metallic Glasses 2016, Kuala Lumpur, Malaysia, (Invited talk).

 6. R. Yukawa, K. Ozawa, S. Yamamoto, H. Iwasawa, K. Shimada, Eike F. Schwier, K. Yoshimatsu, H. Kumigashira, H. Namatame, M. Taniguchi and I. Matsuda,
“Coupling of two-dimensional electrons to phonons at ZnO(10-10) and SrTiO3(001) surfaces”,
International Workshop on Oxide Electronics (WOE22), Paris, France, Oct. 2015, Poster.
 5. R. Yukawa, T Miller, C.-Z. Xu, S. Yamamoto, Sh. Yamamoto, S. Itoh, K. Yoshimatsu, H. Kumigashira, T. -C. Chiang, and I. Matsuda,
“Angle-resolved photoemission studies of the SrRuO3 thin films”,
The 7th International Symposium on Surface Science (ISSS-7), Matsue, Japan, Nov. 2014. Oral.

 4. R. Yukawa, K. Ozawa, S. Yamamoto, H. Iwasawa, J. Jiang, H. Hayashi, T. Horike, Y. Nagata, K. Shimada, H. Namatame, M. Taniguchi, and I. Matsuda, 
Enhanced Electron Interactions on Hydrogen Adsorbed ZnO Surface”,
Meeting of The American Physical Society (MAR14), Denver, Colorado, the United States, Mar. 2014, Oral.

 3. R. Yukawa, K. Ozawa, S. Yamamoto, H. Iwasawa, J. Jiang, H. Hayashi, T. Horike, Y. Nagata, K. Shimada, H. Namatame, M. Taniguchi, and I. Matsuda,
“Study of Hydrogen-induced Metallization and Band-Gap Narrowing on the ZnO Surface”,
The 17th Hiroshima International Symposium on Synchrotron Radiation, Hiroshima University Faculty, Japan, Mar. 2013. Poster.

 2. R. Yukawa, S. Yamamoto, K. Ozawa, M. D'Angelo, M. Ogawa, M.G. Silly, F. Sirotti, and I. Matsuda,
“Polarization-dependent angle-resolved photoemission studies of hydrogen-adsorbed SrTiO3(001)”,
12th International Conference on Electron Spectroscopy and Structure (ICESS 2012), Saint Malo, France, Sep. 2012. Poster.

 1. R. Yukawa, F. Nakamura, Y. Hasegawa, I. Matsuda,
“Study of formation of a surface superstructure by the surface-state mediated interaction”,
Spin-Polarized Scanning Tunneling Microscopy 3 Conference, Seoul, Republic of Korea, Aug. 2010, Poster.


[受賞] 

 2013 Feb. The 17th Hiroshima International Symposium on Synchrotron Radiation.
Best Student Poster Award

[研究資金] 

 2017年度 -
 2018年度
科研費 若手研究(B) 「遷移金属酸化物における2次元電子系に働く多体間相互作用の解明」 研究代表者

 2015年度物質構造科学研究所量子ビーム研究支援事業 研究代表者

[記事等] 

 2011年 8月 湯川龍
「フランスの放射光施設 SOLEIL 利用報告」
PFnews Vo. 29, No. 2, Aug. 2011

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