Yu Stephane Matsushita

Profile Information

Affiliation: Institute of Engineering education (Ph.D. (Science)), Graduate School of Engineering, Tohoku University

Degree: 理学(Tohoku University)

J-GLOBAL ID: 201601007898230099
researchmap Member ID: 7000017793

External link: http://db.tohoku.ac.jp/whois/e_detail/9ae2fd58a2184b8278f5127df996ca3b.html

Research Interests

Research Areas

Nanotechnology/Materials / Thin-film surfaces and interfaces /

Research History

Apr, 2022 - Present

Institute of Engineering education (Ph.D. (Science)), Graduate School of Engineering, Tohoku University
Apr, 2020 - Mar, 2022

Assistant Prof. (Ph.D. (Science)), Advanced Institute for Materials Research, Tohoku University
2015 - Mar, 2020

Assistant Prof. (Ph.D. (Science)), Graduate School of Science Department of Physics, Tohoku University

Awards

Mar, 2015

東北大学青葉理学振興会賞, 東北大学青葉理学振興会

松下ステファン悠
Mar, 2015

東北大学総長賞, 東北大学

松下ステファン悠
May, 2013

第32回表面科学学術会講演奨励賞（スチューデント賞）, 日本表面科学会

松下ステファン悠
Mar, 2012

東北大学理学研究科物理学専攻賞, 東北大学

松下ステファン悠

Papers

Magnetic field induced Anderson localization in the orbital-selective antiferromagnet BaMn2Bi2

Takuma Ogasawara, Kim-Khuong Huynh, Stephane Yu Matsushita, Motoi Kimata, Time Tahara, Takanori Kida, Masayuki Hagiwara, Denis Arčon, Katsumi Tanigaki

Physical Review B, 106(4), Jul 25, 2022
サンガクレンケイキカク「コンナ『ケンキュウトキョウイク』ガオモシロイ」アントレプレナーキョウイク

70(10) 496-499, 2022
Large negative magnetoresistance in the antiferromagnet BaMn2Bi2

Takuma Ogasawara, Kim-Khuong Huynh, Time Tahara, Takanori Kida, Masayuki Hagiwara, Denis Arcon, Motoi Kimata, Stephane Yu Matsushita, Kazumasa Nagata, Katsumi Tanigaki

PHYSICAL REVIEW B, 103(12), Mar, 2021
Large-proximity-induced anomalous Hall effect in Bi2-xSbxTe3-ySey/Cr2Ge2Te6 heterostructure prepared by film transfer method

Kazumasa Nagata, Stephane Yu Matsushita, Xing-Chen Pan, Kim-Khuong Huynh, Katsumi Tanigaki

PHYSICAL REVIEW MATERIALS, 5(2), Feb, 2021
Large thermopower in topological surface state of Sn-BSTS topological insulators: Thermoelectrics and energy-dependent relaxation times

Stephane Yu Matsushita, Kakeru Ichimura, Khuong Kim Huynh, Katsumi Tanigaki

PHYSICAL REVIEW MATERIALS, 5(1), Jan, 2021
Anisotropic surface phonon dispersion of a deuterium-terminated Si(110)-(1 × 1) surface studied by high-resolution electron-energy-loss spectroscopy and first-principles calculations: Isotope effect

Kawamoto, E., Matsushita, S.Y., Okada, Y., Hu, C., Watanabe, K., Haga, K., Yamada, T., Suto, S.

Surface Science, 692 121527-121527, Feb, 2020 Peer-reviewed
Ultrathin films of three-demensional topological insulators by vapor-phase epitaxy: Surface dominant transport in a wide temperature range as revealed by measurements of the Seebeck effect

Stephane Yu Matsushita, Kim-Khuong Huynh, Katsumi Tanigaki

Physical Review B, 99(19) 195302, May, 2019 Peer-reviewed
Negative and positive magnetoresistance in the itinerant antiferromagnet BaMn2Pn2 (Pn=P, As, Sb, and Bi)

Kim-Khuong Huynh, Takuma Ogasawara, Keita Kitahara, Yoichi Tanabe, Stephane Yu Matsushita, Time Tahara, Takanori Kida, Masayuki Hagiwara, Denis Arcon, Katsumi Tanigaki

Physical Review B, 99(19) 195111, May, 2019 Peer-reviewed
Quantum Hall effect of Dirac surface states of as-grown single crystal flakes in Sn-0.02-Bi1.08Sb0.9Te2S without gate control

Kakeru Ichimura, Stephane Yu Matsushita, Kim-Khuong Huynh, Katsumi Tanigaki

APPLIED PHYSICS LETTERS, 115(5) 052104, 2019 Peer-reviewed
Thermoelectric properties of 3D topological insulator: Direct observation of topological surface and its gap opened states

Stephane Yu Matsushita, Khuong Kim Huynh, Harukazu Yoshino, Ngoc Han Tu, Yoichi Tanabe, Katsumi Tanigaki

PHYSICAL REVIEW MATERIALS, 1(5) 054202, Oct, 2017 Peer-reviewed
Effects of the deposition rate on growth modes of Ag islands on the hydrogen-terminated Si(111)-(1x1) surface: The role of surface energy and quantum size effect

Jungmin Kang, Toyoaki Eguchi, Erina Kawamoto, Stephane Yu Matsushita, Kenya Haga, Shino Kanagawa, Andrzej Wawro, Ryszard Czajka, Hiroki Kato, Shozo Suto

JOURNAL OF APPLIED PHYSICS, 122(9) 095303, Sep, 2017 Peer-reviewed
Anisotropic electronic band structure of intrinsic Si(110) studied by angle-resolved photoemission spectroscopy and first-principles calculations

Stephane Yu Matsushita, Akari Takayama, Erina Kawamoto, Chunping Hu, Satoshi Hagiwara, Kazuyuki Watanabe, Takashi Takahashi, Shozo Suto

PHYSICAL REVIEW B, 96(12), Sep, 2017 Peer-reviewed
Large-Area and Transferred High-Quality Three-Dimensional Topological Insulator Bi2-xSbxTe3-ySey Ultrathin Film by Catalyst-Free Physical Vapor Deposition

Ngoc Han Tu, Yoichi Tanabe, Yosuke Satake, Khuong Kim Huynh, Phuoc Huu Le, Stephane Yu Matsushita, Katsumi Tanigaki

NANO LETTERS, 17(4) 2354-2360, Apr, 2017 Peer-reviewed
Surface phonon dispersion on hydrogen-terminated Si(110)-(1 x 1) surfaces studied by first-principles calculations

Stephane Yu Matsushita, Chunping Hu, Erina Kawamoto, Hiroki Kato, Kazuyuki Watanabe, Shozo Suto

JOURNAL OF CHEMICAL PHYSICS, 143(21) 214702, Dec, 2015 Peer-reviewed
Morphology and atomic structure of hydrogen-terminated Si(110)-(1 x 1) surfaces prepared by a wet chemical process

Stephane Yu Matsushita, Erina Kawamoto, Kenya Haga, Taro Yamada, Shozo Suto

SURFACE SCIENCE, 632 135-141, Feb, 2015 Peer-reviewed
Anisotropic surface phonon dispersion of the hydrogen-terminated Si(110)-(1 x 1) surface: One-dimensional phonons propagating along the glide planes

Stephane Yu Matsushita, Kazuki Matsui, Hiroki Kato, Taro Yamada, Shozo Suto

JOURNAL OF CHEMICAL PHYSICS, 140(10) 104709, Mar, 2014 Peer-reviewed
Preparation of clean and well-ordered hydrogen-terminated Si(1 1 0)-(1 × 1) surfaces and the measurements of vibrational modes

S. Suto, K. Matsui, S. Y. Matsushita, H. Kato, H. Nakaya, T. Taoka, A. Kasuya, T. Yamada

Applied Surface Science, 267 90-92, Feb 15, 2013 Peer-reviewed

Misc.

Discover “Who do you want to grow into?” before thinking “What do you want to be?”

Change Forward 2022, HASSO PLATTNER Institute of Design at Stanford., 2022
Nonlinear etching process of Si(110) revealed by Kuramoto-Sivashinsky equation

芳賀健也, 川本絵里奈, 川勝年洋, 松下ステファン悠, 山田太郎, 須藤彰三

日本物理学会講演概要集(CD-ROM), 77(1), 2022
First-Principles Study on the Surface State of the Three-Dimensional Topological Insulator BiSbTe₂S

圓谷貴夫, 山内邦彦, 松下ステファン悠, 谷垣勝己

日本物理学会講演概要集(CD-ROM), 77(2), 2022
東北大学のアントレプレナー教育の現状と将来像

池ノ上芳章, 森谷祐一, 松下ステファン悠

青葉工業会報, 65(5), Dec, 2021
Electronic transport properties of the Topological insulator surfaces revealed by the magnetic field dependence of thermoelectric properties.

松下ステファン悠, 永田一将, HUYNH Kim-Khuong, 谷垣勝己

日本物理学会講演概要集(CD-ROM), 76(2), 2021
Observation of Magnetoresistance in transferred Bi_1.5Sb_0.5Te_1.7Se_1.3/Cr₂Ge₂Te₆

永田一将, 松下ステファン悠, PAN Xing-Chen, HUYNH Kim Khuong, 谷垣勝己

日本物理学会講演概要集(CD-ROM), 76(1), 2021
Conductivity scaling of BaMn₂Bi₂ for magnetic field and temperature

小笠原拓磨, HUYNH Khuong Kim, 松下ステファン悠, 谷垣勝己

日本物理学会講演概要集(CD-ROM), 76(1), 2021
The scattering mechanism of surface Dirac states of Sn-Bi_1.1Sb_0.9Te₂S revealed by thermoelectric transports.

松下ステファン悠, 市村翔, 永田一将, KIM Khuong Huynh, 谷垣勝己

日本物理学会講演概要集(CD-ROM), 75(1) 1266-1266, 2020
Thermoelectric properties of gapped-surface Dirac states on 3D-topological insulators.

松下ステファン悠

岩谷直治記念財団研究報告書, 43, 2020
Observation of large anomalous Hall effect in Bi_1.5Sb_0.5Te_1.7Se_1.3/Cr₂Ge₂Te₆ heterostructure prepared by wet-film transfer technique

永田一将, 松下ステファン悠, PAN Xing-Chen, KIM Khuong Huynh, 谷垣勝己

日本物理学会講演概要集(CD-ROM), 75(2), 2020
遍歴反強磁性物資BaMn₂Pn₂(Pn:As,Sb,Bi)の巨大磁気抵抗

谷垣勝己, Khuong K. Huynh, 松下ステファン悠

東北大学極低温科学センターだより, (20) 11-15, Nov, 2019
Magnetotransport properties in K_xBa_1-xMn₂Bi₂

Ogasawara Takuma, Kim-Huynh Khuong, Matsushita Stephane-Yu, Tahara Taimu, Kida Takanori, Hagiwara Masayuki, Tanigaki Katsumi

Meeting Abstracts of the Physical Society of Japan, 74.2 1857-1857, 2019
Thermoelectric properties of organic semiconductors

QIU Lingwei, MATSUSHITA Stephane Yu, TANIGAKI Katsumi

日本物理学会講演概要集(CD-ROM), 74(1), 2019
Negative and postive magnetoresistance in BaMn₂Pn₂ antiferromagnets

HUYNH K. Khuong, OGASAWARA Takuma, KITAHARA Keita, MATSUSHITA Stephane Yu, TAHARA Taimu, KIDA Takanori, HAGIWARA Masayuki, TANIGAKI Katsumi

日本物理学会講演概要集(CD-ROM), 74(2), 2019
Electronic transport properties of three-dimensional topological insulator Sn-BiSdTe₂S II

Ichimura Kakeru, Matsushita Stephane Yu, Nagata Kazumasa, Tanigaki Katsumi

Meeting Abstracts of the Physical Society of Japan, 74(1) 1453-1453, 2019
The thickness dependence of thermoelectric properties in Bi_1.5Sb_0.5Te_1.7Se_1.3 thin film

Nagata Kazumsa, Matsushita Stephane Yu, Huynh Kim Khuong, Tanigaki Katsumi

Meeting Abstracts of the Physical Society of Japan, 74(2) 1012-1012, 2019
Quantum Hall effect and Seebeck coefficient of the topological surface Dirac state in Sn-Bi_1.1Sb_0.9Te₂S

Matsushita Stephane Yu, Ichimura Kekeru, Nagata Kazumasa, Huynh Kim-Kuong, Tanigaki Katsumi

Meeting Abstracts of the Physical Society of Japan, 74(2) 1013-1013, 2019
Plasmon energy and dispersion at Ag clusters studied by HREELS

Yamazaki H., Mita M., Matsushita S. Y., Haga K., Eguchi T., Suto S.

Meeting Abstracts of the Physical Society of Japan, 74(2) 2083-2083, 2019
STS/STS study of local electronic states of H-terminated Si(110) surface

Haga Kenya, Eguchi Toyoaki, Matsushita Stephane Yu, Fukui Kunitora, Ito Takashi, Hu Chunping, Watanabe Kazuyuki, Suto Shozo

Meeting Abstracts of the Physical Society of Japan, 74(2) 2049-2049, 2019
Ultrathin film of 3D topological insulators by vapor-phase epitaxy: Surface dominant transport in wide temperature revealed by Seebeck measurement

Stephane Yu Matsushita, Khuong Kim Huynh, Katsumi Tanigaki

Dec 21, 2018

Presentations

Electronic transport properties of the Topological insulator surfaces revealed by the magnetic field dependence of thermoelectric properties.

Stephane Yu Matsushita, Kazumasa Nagata, Kim-Khuong Huynh, Katsumi Tanigaki

Sep 22, 2021
The large magnetoresistance in BaMn2Bi2 antiferromagnets and its possible origins

Sep 10, 2020
転写法によるBi1.5Sb0.5Te1.7Se1.3/Cr2Ge2Te6ヘテロ構造の作製と異常ホール効果の観測

永田一将, 松下ステファン悠, ing-Chen Pan, Kim Khuong Huynh, 谷垣勝己

日本物理学会2020年秋季大会, Sep 9, 2020
The scattering mechanism of surface Dirac states of Sn-Bi1.1Sb0.9Te2S revealed by thermoelectric transports.

Stephane Yu Matsushita, Kakeru Ichimura, Kazumasa Nagata, Kim-Khuong Huynh, Katsumi Tanigaki

Mar 19, 2020
Sn-Bi1.1Sb0.9Te2Sにおける表面ディラック電子による量子ホール効果とゼーベック係数

松下ステファン悠, 市村翔, 永田一将, K.K. Huynh, 谷垣勝己

日本物理学会 2019年秋季大会, Sep 10, 2019
Bi1.5Sb0.5Te1.7Se1.3薄膜における熱電特性の膜厚依存性

永田一将, 松下ステファン悠, K.K. Huynh, 谷垣勝己

日本物理学会 2019年秋季大会, Sep 10, 2019
Quantum hall effect and thermoelectric properties of surface Dirac states in Sn-Bi1.1Sb0.9Te2S crystal

MATSUSHITA, Stephane Yu

Study of matter at Extreme Condition (SMEC2019), Mar 31, 2019 Invited
Thermoelectric properties of organic semiconductors

Qiu Lingwei, 松下ステファン悠, 谷垣勝己

日本物理学会第74回年次会, Mar 14, 2019
3次元トポロジカル絶縁体Sn-BiSbTe2Sの電子輸送特性Ⅱ

市村翔, 松下ステファン悠, 永田一将, 谷垣勝己

日本物理学会第74回年次大会, Mar, 2019
3次元トポロジカル絶縁体Sn0.02Bi1.08Sd0.9Te2Sの電気輸送特性：電気抵抗、ホール抵抗、磁気抵抗及びゼーベック係数の複合測定

市村翔, 松下ステファン悠, 谷垣勝己

日本物理学会2018年秋季大会, Sep, 2018
Bi2-xSbxTe3-ySey薄膜の熱電特性：電界効果を用いたフェルミ準位の制御とその影響

松下ステファン悠, Kim-Khuong Huynh, 田邉洋一, 谷垣勝己

日本物理学会2018年秋季大会, Sep, 2018
Thermoelectric properties of the surface Dirac states of 3D topological insulators

MATSUSHITA, Stephane Yu

6th World Congress and Expo on Nanotechnology and Materials Science, Apr 16, 2018 Invited
Bi2-xSbxTe3-ySey薄膜の電子輸送特性：量子振動とHall測定の比較から見た表面戦士占有率の評価

松下ステファン悠, 市村翔, Kim-Khuong Huynh, 田邉洋一, 谷垣勝己

日本物理学会第73回年次大会, Mar, 2018
Thermoelectric properties of ultrathin films of 3D Topological insulator

2017 EMN Meeting on 2D materials, Aug 8, 2017
3次元トポロジカル絶縁体Bi_2-xSb_xTe_3-ySe_y薄膜の熱電特性の直接観測

Stephane Yu Matsushita, Tu Ngoc Han, 田邉洋一, Khuong Kim Huynh, 吉野浩一, 谷垣勝己

日本物理学会第72回年次会, Mar 17, 2017
Thermoelectric properties of ultrathin films of Bi_2-xSb_xTe_3-ySe_y

Stephane Yu Matsushita, Khuong Kim Huynh, Harukazu Yoshino, Ngoc Han Tu, Yoichi Tanabe, Katsumi Tanigaki

American Physical Society March Meeting 2017, Mar 13, 2017
気相成長させたトポロジカル絶縁体Bi_2-xSb_xTe_3-ySe_y薄膜の電子状態：輸送現象の膜厚依存性 II

松下ステファン悠, Ngoc Han Tu, 田邉洋一, Khuong Kim Huynh, 渡部智貴, Le Huu Phuoc, 吉野治一, 谷垣勝己

日本物理学会２０１６年秋季大会, Sep, 2016
気相成長させたトポロジカル絶縁体Bi_2-xSb_xTe_3-ySe_y薄膜の電子状態：輸送現象の膜厚依存性

Stephane Yu Matsushita, Tu Ngoc Han, 田邉洋一, Khuong Kim Huynh, 佐竹遥介, 渡部智貴, Le Huu Phuoc, 吉野治一, 谷垣勝己

日本物理学会第71回年次大会, Mar, 2016
水素終端Si(110)-(1×1)表面のフォノンII：実験と理論

松下ステファン悠, 胡春平, 川本絵里奈, 加藤大樹, 渡辺一之, 須藤彰三

日本物理学会秋季大会, Sep 16, 2015
水素終端Si(110)-(1x1)表面のSTM像の電圧依存性と電子状態との相関

Stephane Yu Matsushita, 松田卓也, 胡春平, 永田龍太郎, 川本絵里奈, 渡辺一之, 須藤彰三

日本物理学会秋季大会, Sep 16, 2015

Teaching Experience

物質理工学概論 (東北大学大学院)

Research Projects

Unusual Thermoelectric properties in Topological Insulators with various Device designs

Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (B), Grant-in-Aid for Scientific Research (B), Japan Society for the Promotion of Science, Apr, 2021 - Mar, 2024
The effects of non-trivial electronic and spin states in the thermoelectric properties of topological materials

Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research on Innovative Areas (Research in a proposed research area), Grant-in-Aid for Scientific Research on Innovative Areas (Research in a proposed research area), Japan Society for the Promotion of Science, Apr, 2018 - Mar, 2020
Direc observation of thermoelectric properties of surface Dirac states on topological insulators

Grants-in-Aid for Scientific Research Grant-in-Aid for Young Scientists (B), Grant-in-Aid for Young Scientists (B), Japan Society for the Promotion of Science, Apr, 2017 - Mar, 2020

Matsushita Stephane Yu
トポロジカル絶縁体薄膜におけるエネルギーギャップと熱電物性の相関の解明と新たな熱電変換材料の創生

岩谷科学技術研究助成, 岩谷直治記念財団, Apr, 2018 - Mar, 2019

松下ステファン悠
3次元トポロジカル絶縁体BSTS薄膜を用いた表面ディラック電子系の熱電物性の直接観測をその解明

矢崎科学技術振興記念財団奨励研究助成, 矢崎科学技術振興記念財団, Apr, 2017 - Mar, 2018

松下ステファン悠

Academic Activities

Japan-Europe Entrepreneurship Synergy Days（JP-EU ESD）

Planning, management, etc.

Feb 17, 2021 - Mar 2, 2021

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