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Quantum Science on Strong Correlation

FIRST program QS²C was finished. Last update: June 3, 2014.

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Mar. 03, 2014

Dirac electron states formed at the heterointerface between a to pological-insulator and a conventional semiconductor
[Press release: February 20, 2014]

The research result related to QS²C was released.
Publication：
R. Yoshimi, A. Tsukazaki, K. Kikutake, J. G. Checkelsky, K. S. Takahashi, M. Kawasaki and Y. Tokura
"Dirac electron states formed at the heterointerface between a to pological-insulator and a conventional semiconductor"
Nature Materials 13, 253–257 (20 February 2014)

Jan. 29, 2014

Biskyrmion states and their current-driven motion in a layered manganite
[Press release: December 28, 2013]

The research result related to QS²C was released.
Publication：
X. Z. Yu, Y. Tokunaga, Y. Kaneko, W. Z. Zhang, K. Kimoto, Y. Matsui, Y. Taguchi
& Y. Tokura
"Biskyrmion states and their current-driven motion in a layered manganite"
Nature Communications 5, 3198, doi: 10.1038/ncomms4198 (28 January 2014)

Jan. 29, 2014

Biskyrmion states and their current-driven motion in a layered manganite
[Press release: December 28, 2013]

The research result related to QS²C was released.
Publication：
X. Z. Yu, Y. Tokunaga, Y. Kaneko, W. Z. Zhang, K. Kimoto, Y. Matsui, Y. Taguchi
& Y. Tokura
"Biskyrmion states and their current-driven motion in a layered manganite"
Nature Communications 5, 3198, doi: 10.1038/ncomms4198 (28 January 2014)

Jan. 29, 2014

Thermally Driven Ratchet Motion of a Skyrmion Microcrystal and Topological Magnon Hall Effect
[Press release: December 27, 2013]

The research result related to QS²C was released.
Publication：
Masahito Mochizuki, Xiuzhen Yu, Shinichiro Seki, Naoya Kanazawa, Wataru Koshibae, Jiadong Zang, Maxim Mostovoy, Yoshinori Tokura, and Naoto Nagaosa.
"Thermally Driven Ratchet Motion of a Skyrmion Microcrystal and Topological Magnon Hall Effect"
Nature Materials doi: 10.1038/nmat3862 (26 January 2014)

Jan. 10, 2014

Dr. Yoshinori Tokura elected member of the Royal Swedish Academy of Sciences

On December 11, the Royal Swedish Academy of Sciences, a prestigious body which selects recipients of the Nobel Prizes in physics and chemistry, elected Dr. Yoshinori Tokura, Director of the RIKEN Center for Emergent Matter Science (CEMS), into its membership.
With this, Tokura became one of 175 non Swedish people from around the world to have been accepted into the ranks of the Academy, which was founded in 1739.
Tokura is head of CEMS, an institute in RIKEN dedicated to discovering more efficient technologies that will enable us to produce energy without putting a burden on the environment, as well as decrease our energy consumption. They are achieving this by combining advanced research in physics, chemistry and electronics in order to produce new technology such as highly efficient energy conversion devices and low-consumption electronics.
Detail and links are below;
RIKEN Official Website | News & Media ： http://www.riken.jp/en/pr/topics/2014/20140109_1/
The Royal Swedish Academy of Science: http://www.kva.se/en/
The Royal Swedish Academy of Science | Press release: http://www.kva.se/en/News/News-2013/Tree-new-members-elected-to-the-Academy/

Dec. 20, 2013

Detection of Berry’s Phase in a Bulk Rashba Semiconductor
[Press release: December 20, 2013]

The research result related to QS²C was released.
Publication：
H. Murakawa, M. S. Bahramy, M. Tokunaga, Y. Kohama, C. Bell, Y. Kaneko, N. Nagaosa, H. Y. Hwang, Y. Tokura
"Detection of Berry’s Phase in a Bulk Rashba Semiconductor"
Science 342, 1490-1493 (20 December 2013)

Dec. 12, 2013

Polarization Switching Ability Dependent on Multidomain Topology in a Uniaxial Organic Ferroelectric
[Press release: December 12, 2013]

The research result related to QS²C was released.
Publication：
F. Kagawa, S. Horiuchi, N. Minami, S. Ishibashi, K. Kobayashi, R. Kumai, Y. Murakami, and Y. Tokura
"Polarization Switching Ability Dependent on Multidomain Topology in a Uniaxial Organic Ferroelectric"
Nano Letters doi:10.1021/nl403828u (12 December 2013)

Dec. 05, 2013

Yoshinori Tokura (Core Researcher), Director of RIKEN Center for Emergent Matter Science (CEMS), has been selected to receive a new honorary doctorate at the Uppsala University Faculty of Science and Technology.

On October 24, Dr. Yoshinori Tokura, Director of RIKEN Center for Emergent Matter Science (CEMS) have been selected to receive new honorary doctorates at the Uppsala University Faculty of Science and Technology. The awarding ceremony will be held on January 24.
Outline of this prize:
Yoshinori Tokura, a professor at Tokyo University and research director at RIKEN, is one of the world's ten most-cited physicists over the last 30 years. His research targets a broad field in physics, chemistry, and materials research, including high-temperature superconducting materials and strongly correlated electron systems with spintronic and multiferroic properties.
Uppsala University: http://www.uu.se/
Uppsala University press release: http://www.uu.se/en/news/news-document/?id=2833&area=2,12,16&typ=artikel&na=&lang=en

Nov. 22, 2013

FIRST International Symposium on “Topological Quantum Technology”
[The Online Registration is available now.]

FIRST International Symposium on “Topological Quantum Technology”
Date: January 27-30, 2014
Venue: Hongo campus of the University of Tokyo (Please check the detail on the official website.)
Registration fee: Free
Registration is available now on the official website below.
Official website : http://www.cems.riken.jp/2014first_sympo/index.html
Deadlines:
Abstract Submission and registration (Poster) : December 20, 2013
Registration (Participation Only) : January 15, 2014

Nov. 14, 2013

RIKEN-APW joint workshop “Highlights in condensed matter physics”
[The Online Registration is available now.]

RIKEN-APW joint workshop “Highlights in condensed matter physics”
Date: January 23-25, 2014
Venue: Okochi Hall, RIKEN, Wako, Saitama, Japan
Registration fee: Free
Registration is available now on the official website below.
Official website : http://www.riken.jp/qs2c/TF/2014_TF/index.html
Deadlines:
Abstract Submission and registration (Poster) : December 19, 2013
Registration (Participation Only) : January 19, 2014

Sept. 24, 2013

FIRST-QS²C Workshop on “Emergent Phenomena of Correlated Materials”
[The Online Registration deadline is Oct. 04, 2013]

FIRST-QS²C Workshop on “Emergent Phenomena of Correlated Materials”
Date: November 13-16, 2013
Venue: Shinagawa Intercity Hall (2-15-4 Konan, Minato-ku, Tokyo 108-6105, Japan)
Registration fee: Free (Banquet isn’t included.)
Registration page / Official website : http://www.riken.jp/qs2c/2013WS/index.html
Deadlines:
Registration/Banquet : October 4, 2013
Abstract Submission : October 4, 2013

Sept. 11, 2013

Advances towards the high density/ low energy cost devices
–Theoretical design of the manipulation of swirling electronic spins(skyrmion)–
[Press release: September 09, 2013]

RIKEN-Todai collaborators have explored theoretically the current-driven dynamics of skyrmion – a article in magnet – in constricted geometries such as the memories or circuits by numerical simulations.
The detail is below;
School of Engineering, The Univ. of Tokyo：
http://www.t.u-tokyo.ac.jp/etpage/release/2013/2013090902.html
Publication：
Junichi Iwasaki, Masahito Mochizuki & Naoto Nagaosa
"Current-induced skyrmion dynamics in constricted geometries"
Nature Nanotechnology doi:10.1038/nnano.2013.176 (08 September 2013)

Sept. 11, 2013

Controlling size and helicity of a spin-vortex skyrmion
–Towards power-saving spintronics memory devices–
[Press release: September 09, 2013]

Prof. Yoshinori Tokura at the Graduate School of Engineering of the University of Tokyo, graduate student Kiyou Shibata, and their collaborators have observed and analyzed a series of Mn_1-xFe_xGe compounds by transmission electron microscopy.
The detail is below;
School of Engineering, The Univ. of Tokyo：
http://www.t.u-tokyo.ac.jp/etpage/release/2013/2013090901.html
Publication：
K. Shibata, X. Z. Yu, T. Hara, D. Morikawa, N. Kanazawa, K. Kimoto, S. Ishiwata, Y. Matsui & Y. Tokura
"Towards control of the size and helicity of skyrmions in helimagnetic alloys by spin–orbit coupling"
Nature Nanotechnology doi:10.1038/nnano.2013.174 (08 September 2013)

Sept. 04, 2013

Discovery of the microwave rectification effect using nano-sized spin whirl “skyrmion”
–A new principle of a microwave response demonstrated–
[Press release: September 02, 2013]

Prof. Yoshinori Tokura, leading a FIRST program “Quantum Science on Strong Correlation”, graduate student Yoshihiro Okamura, Dr. Fumitaka Kagawa at the University of Tokyo and their colleagues discovered that the skyrmion possesses a new functionality, that is, the irradiation-direction-dependent absorption of microwaves. This functionality may open a new avenue for the skyrmion-based devices, such as a microwave rectifying device or an inductor with tunable magnetic permeability by applying an electric field.
The detail is below;
School of Engineering, The Univ. of Tokyo：
http://www.t.u-tokyo.ac.jp/etpage/release/2013/2013090201.html
Publication：
Y. Okamura, F. Kagawa, M. Mochizuki, M. Kubota, S. Seki, S. Ishiwata, M. Kawasaki, Y. Onose & Y. Tokura
"Microwave magnetoelectric effect via skyrmion resonance modes in a helimagnetic multiferroic"
Nature Communications 4, 2391 (30 August 2013)

Aug. 28, 2013

FIRST-QS²C Workshop on “Emergent Phenomena of Correlated Materials”
[The Online Registration is available now.]

FIRST-QS²C Workshop on “Emergent Phenomena of Correlated Materials”
Date: November 13-16, 2013
Venue: Shinagawa Intercity Hall (2-15-4 Konan, Minato-ku, Tokyo 108-6105, Japan)
Registration fee: Free (Banquet isn’t included.)
Registration page / Official website : http://www.riken.jp/qs2c/2013WS/index.html
Deadlines:
Registration/Banquet : October 4, 2013
Abstract Submission : October 4, 2013

Aug. 26, 2013

A Strained Organic Field-Effect-Transistor with a Gate-Tunable Superconducting Channel
[Press release: August 23, 2013]

The research result related to QS²C was released.
The detail is below:
National Institute of Molecular Science：
http://www.ims.ac.jp/english/topics/2013/130823.html
Publication：
Hiroshi M. Yamamoto, Masaki Nakano, Masayuki Suda, Yoshihiro Iwasa, Masashi Kawasaki & Reizo Kato
"A strained organic field-effect transistor with a gate-tunable superconducting channel"
Nature Communications doi:10.1038/ncomms3379 (23 August 2013)

Aug. 02, 2013

Controlling spins by an electric field
–New possibility of WSe2 as a post-graphene material–
[Press release: July 29, 2013]

A group of researchers including Dr. H. Yuan, Professors R. Arita and Y. Iwasa, from Quantum Phase Electronic Center and Department of Applied Physics, University of Tokyo, in collaboration with Dr. M.S. Bahramy and Professor Nagaosa, the vice-president of CEMS, RIKEN, have succeeded in developing a state-of-the-art field-effect transistor, in which a strong electric field can be applied to WSe2, one of the post-graphene materials.
The detail is below:
School of Engineering, The Univ. of Tokyo：
http://www.t.u-tokyo.ac.jp/etpage/release/2013/2013072901.html
Publication：
Hongtao Yuan, Mohammad Saeed Bahramy, Kazuhiro Morimoto, Sanfeng Wu, Kentaro Nomura, Bohm-Jung Yang, Hidekazu Shimotani, Ryuji Suzuki, Minglin Toh, Christian Kloc, Xiaodong Xu, Ryotaro Arita, Naoto Nagaosa & Yoshihiro Iwasa
"Zeeman-type spin splitting controlled by an electric field"
Nature Physics doi:10.1038/nphys2691 (28 July 2013)

July 26, 2013

Putting the heat on semimetals
RIKEN RESEARCH / Highlight of the Month : Materials
[Published on July 26, 2013]

The article related to QS²C published in RIKEN Research / Research Highlights: Materials.
Putting the heat on semimetals
A layered semimetal laced with atomic impurities offers highly efficient conversion between heat and electrical current
http://www.rikenresearch.riken.jp/eng/hom/7379.html
Publication：
* S. Ishiwata, Y. Shiomi, J. S. Lee, M. S. Bahramy, T. Suzuki, M. Uchida, R. Arita, Y. Taguchi & Y. Tokura
"Extremely high electron mobility in a phonon-glass semimetal"
Nature Materials 12, 512–517 (21 April 2013 / * Corrected online: 29 April 2013)

July 25, 2013

Strain induced magnetization in strongly correlated electron insulator
–Control of spin/orbital ordering of correlated electrons by strain–
[Press release: July 11, 2013]

The group of Dr. Fujioka and Prof. Tokura have demonstrated that the cobalt oxide (LaCoO₃), which is originally a nonmagnetic material, can be converted into a magnet by application of the tensile strain, utilizing the ordering phenomena of electron spins and orbitals.
The press release article on The Univ. of Tokyo website：
http://www.t.u-tokyo.ac.jp/etpage/release/2013/2013071101.html
The detail of this release on KEK website:
http://legacy.kek.jp/intra-e/press/2013/071010/
Publication：
J. Fujioka, Y. Yamasaki, H. Nakao, R. Kumai, Y. Murakami, M. Nakamura, M. Kawasaki, and Y. Tokura
“Spin-Orbital Superstructure in Strained Ferrimagnetic Perovskite Cobalt Oxide”
Phys. Rev. Lett. 111, 027206 (09 July 2013)

July 9, 2013

Dr. Hiroki Wadati received 2013 NIMS Conference Poster Presentation Award.

Dr. Hiroki Wadati (Lecturer of Quantum-Phase Electronics Center (QPEC), The Univ. of Tokyo) gave a poster presentation in 2013 NIMS Conference and received 2013 NIMS Conference Poster Presentation Award.
Title: “Phase competitions in Pr_0.5Ca_0.5MnO₃/La_0.5Sr_0.5MnO₃ superlattices”
2013 NIMS Conference official website： http://www.nims.go.jp/nimsconf/2013/index.html

June 17, 2013

103rd Japan Academy Prize and Imperial Prize awarded to Professor Yoshinori Tokura.
The award ceremony was held on June 17 at the Japan Academy, Tokyo.

On March 12, Professor Yoshinori Tokura, Core Researcher of QS2C, was awarded the 103rd Japan Academy Prize and the Imperial Prize for his pioneering work on “strongly correlated electron materials”. The award ceremony was held on June 17 at the Japan Academy, Tokyo.
The Japan Academy:
About The Imperial Prize and Japan Academy Prize:
http://www.japan-acad.go.jp/en/activities/
RIKEN official website/ News（Mar. 15, 2013）：
“103rd Japan Academy Prize and Imperial Prize awarded to RIKEN ASI Emergent Materials Department Director Dr. Yoshinori Tokura”
http://www.riken.go.jp/engn/r-world/topics/130315/index.html

June 11, 2013

Discovery of an electronic glass state
–Major progress in understanding the vitrification mechanism–
[Press release: June 10, 2013]

Dr. Fumitaka Kagawa at Department of Applied Physics, University of Tokyo, discovered that a charge-cluster glass evolves on cooling in an organic conductor, in collaboration with Takuro Sato (Master course students at the University of Tokyo), Dr. Kazuya Miyagawa, Prof. Kazushi Kanoda (the University of Tokyo), Prof. Yoshinori Tokura (the University of Tokyo and Group director of Riken), Dr. Kensuke Kobayashi, Prof. Reiji Kumai, and Prof. Youichi Murakami from the Institute of Materials Structure Science at KEK.
Press release detail:
Univ. of Tokyo website
http://www.t.u-tokyo.ac.jp/etpage/release/2013/2013061001.html
Publication：
F. Kagawa, T. Sato, K. Miyagawa, K. Kanoda, Y. Tokura, K. Kobayashi, R. Kumai & Y. Murakami
“Charge-cluster glass in an organic conductor”
Nature Physics (09 June 2013) doi:10.1038/nphys2642

Apr. 22, 2013

Toward high efficiency thermoelectric material operating at low temperatures
–Extremely high electron mobility in a layered material with a silver nanosheet–
[Press release: Apr. 22, 2013]

Associate Professor Shintaro Ishiwata and Professor Yoshinori Tokura's group at the University of Tokyo Graduate School of Engineering and researchers in RIKEN Center for Emergent Matter Science (Director: Yoshinori Tokura) have discovered that a layered material β-CuAgSe is promising for high-efficiency thermoelectrics operating at around room temperature.
The press release article on The Univ. of Tokyo website：
http://www.t.u-tokyo.ac.jp/etpage/release/2013/2013042201.html
Publication：
S. Ishiwata, Y. Shiomi, J. S. Lee, M. S. Bahramy, T. Suzuki, M. Uchida, R. Arita, Y. Taguchi & Y. Tokura
“Extremely high electron mobility in a phonon-glass semimetal”
Nature Materials (21 April 2013) doi:10.1038/nmat3621