物理学院 School of Physics, Nanjing University

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Emergent Iontronics

2016年11月21日

Speaker: Prof. Yoshi Iwasa

Quantum-Phase Electronics Center & Department of Applied Physics, University of Tokyo, Tokyo 113-8656, Japan

RIKEN Center for Emergent Matter Science, Wako 351-0198, Japan

Date: 20161123日上午11:00, Location: 唐仲英楼A313

Abstract:

In your mobile phones, there are two kinds of important devices, billions of transistors and a battery. The transistor controls electron flow in a semiconductor to enable processing and storage of information, while the latter stores electrochemical energy for driving the former. In the latest decade, devices with combined concepts of transistors and batteries, electrochemical transistors, are receiving increasing interests, because they can offer new opportunities beyond conventional current switching functions of all solid transistors.

Surprises came from a simple replacement of solid gate dielectrics in field effect transistors (FETs) with electrolytes, which low us to form two dimensional (2D) electron systems at the transistor channel with the density of 1014 cm-2, which is 1 – 2 orders of magnitude larger than that achieved in conventional FETs. This type of electrochemical transistor was named as electric double layer transistor (EDLT). Taking the advantage of ultrahigh density 2D electron systems, we have successfully realized electric field induced superconductivity [1], ferromagnetism [2], Mott-Hubbard transition [3], which have been impossible or at least extremely difficult in conventional all solid FETs.

In particular, the 2D crystals from transition metal dichaocogenides and other layered materials offers an ideal platform for the EDLT device, due to their dangling bond free surface structures. In fact, we have demonstrated electric field induced superconductivity [4] and chiral light source [5] based on EDLTs of 2D crystals. Also, we found that the electric field induced superconductivity in the EDLT configurations provides novel plat forms of highly crystalline 2D superconductors [6, 7]. As such, EDLT is creating an innovative concept of field effect phase control in a variety of materials. In this lecture, I will review the current status of “Emergent Iontronics”, ion-controlled electronics [8].

 

References

[1] K. Ueno et al., Nat. Mater. 7, 855 (2008).

[2] Y. Yamada et al., Science 127, 1065 (2011).

[3] M. Nakano et al., Nature 487, 459 (2012).

[4] J. T. Ye et al., Science 338, 1193 (2012).

[5] Y. J. Zhang et al., Science 344, 725 (2014).

[6] Y. Saito et al. Science 350, 409 (2015).

[7] Y. Saito et al., Nature Physics 12, 144 (2016).

[8] M. Kawasaki and Y. Iwasa, Nature 489, 510 (2012).

 

 

Bio:

Professional Preparation

Ph.D., Department of Applied Physics, University of Tokyo, 1986

M.E., Department of Applied Physics, University of Tokyo, 1983

B.E., Department of Applied Physics, University of Tokyo, 1981

 

Experience & Employment

Team Leader, RIKEN, 2010-present

Professor, Quantum Phase Electronics Center, University of Tokyo, 2010 - present

Professor, Institute for Materials Research, Tohoku University, 2001 - 2009

Associate Professor, Japan Advanced Institute of Science and Technology, 1994 - 2001

Visiting Researcher, AT&T Bell Laboratories, Murray Hill NJ, 1993 - 1994

Lecturer, Department of Applied Physics, University of Tokyo, 1991 - 1994

Research Associate, Department of Applied Physics, University of Tokyo, 1986 – 1991

 

Honors and Awards

Prize for Science and Technology, Honda Frontier Prize (2015), The Commendation for Science and Technology by the Minister of Education, Culture, Sports, Science and Technology (2014), Superconductivity Science and Technology Award (2010),  Yazaki Science Prize (2006), Japan IBM Science Prize (2004), Daiwa Adrian Prize (2004), Materials Science Research Award (2002)


 

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