Department of Advanced Materials Science, Graduate School of Frontier Sciences, The University of Tokyo

Research Groups

Taka-hisa Arima & Yusuke Tokunaga Group

Applied Physics [Correlated-Matter Physics]

Taka-hisa Arima & Yusuke Tokunaga Group

Inquiry

Home Page, TEL: +81-4-7136-3805 (Arima) , TEL: +81-4-7136-3770 (Tokunaga) , e-mail: arima@k.u-tokyo.ac.jp(Arima) , e-mail: y-tokunaga@k.u-tokyo.ac.jp(Tokunaga)


Strongly correlated electron systems: Fertile ground for development of new functional materials

The semiconductor technology is the most significant accomplishment originating from twenty-century solid state physics. The band model well describes the charge carriers in semiconductors, and is very useful for designing many kinds of devices such as diodes, transistors, memories, photodiodes, and CCDs. Nonetheless, the physical properties of all the materials cannot be predicted by the band model. Strong correlation between electrons is a major source of the discrepancy with the band model. A lot of issues related to the strong electron correlation still remain to be solved and hence attract a bunch of researchers.

Another reason why we are interested in The strongly correlated electron systems also provide a rich variety of functions. We are exploring novel physical properties arising from strong electron correlation by paying special attention to symmetry breaking.

Professor Taka-hisa Arima

Profile

Professor Taka-hisa Arima

  • 1991.9~1995.3:
    Research Associate, Department of Physics, University of Tokyo
  • 1995.4~1995.10:
    Research Associate, Department of Applied Physics, University of Tokyo
  • 1995.11~2004.6:
    Associate Professor, Institute of Materials Science, University of Tsukuba
  • 2004.7~2011.3:
    Professor, Institute of Multidisciplinary Research for Advanced Materials, Tohoku University
  • 2011.4~present:
    Professor, Department of Advanced Materials Science, University of Tokyo

Associate Professor Yusuke Tokunaga

プロフィール

Associate Professor Yusuke Tokunaga

  • 2005.3:
    Ph. D., Dept. of Applied Physics, University of Tokyo
  • 2005.4~2007.3:
    Researcher, ERATO Tokura Spin Superstructure Project, JST
  • 2007.4~2011.3:
    Researcher, ERATO Tokura Multiferroics Project, JST
  • 2011.4~2013.3:
    ASI Research Scientist, Advansed Science Institute (ASI),RIKEN
  • 2013.4~2014.11:
    Senior Research Scientist, RIKEN Center for Emergent Matter Science
  • 2014.12~:
    Associate Professor, Department of Advanced Materials Science, University of Tokyo

Research

Introduction of the study

We are interested in the strongly-correlated electron systems which show novel physical properties. We design such materials, grow crystals, measure their physical properties, and investigate the origin of the physical responses. Here are some typical examples:

  • Control of electric polarization of matter with a magnetic field
  • Change in shape of matter with a magnetic field
  • Control of magnetism of matter with an electric field
  • Control of optical property with a magnetic or electric field
  • Directional birefringence/dichroism

All of these physical responses are related to the simultaneous breaking of symmetries. We often utilize the facilities for synchrotron and neutron experiments to reveal the symmetry breaking.

Message from a senior

Shingo Toyoda

Shingo Toyoda

Material science is not only an interesting field of science but also has potential for changing the world. For example, if a room-temperature superconductor would be discovered, the electricity power could be transmitted without any energy loss. Moreover, to explore a functional material from many matters is fun, because I feel like hunting a treasure.

Introduction of the study