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  Iontronics: Recent development of Ion controlled Electronics



Time: 1:30pm, March 30 (Thursday)

Title: Iontronics: Recent development of Ion controlled Electronics

Speaker: Prof. Yoshihiro Iwasa
   (Quantum-Phase Electronics Center & Department of Applied Physics, University of Tokyo)
   (RIKEN Center for Emergent Matter Science, Japan)

Place:Science Building III 1F SC157

Voltage control of electronic properties has produced a variety of electronic functions,
particularly in semiconductor electronics. The most powerful example is the field effect
transistor (FET) devices, in which electron flow is controlled by the external voltage
through the electrostatic voltage. By introduction of electrochemical concept in the FET
devices, the electronic properties are much more enhanced, and could reach voltage-induced
superconductivity, for instance. In this presentation, we will review recent activities in "iontronics",
which means the ion-controlled electronics. This is a fused notion of ionics and electronics,
where the central concept is the in-situ probe of electronics properties in the electrochemical processes.
One of the examples is utilizing the ultrahigh electric filed produced at the electric double layer,
reaching more than 10 MV/cm or 1 V/nm, which is difficult or almost impossible to realize
in the all solid state devices.

Devices fabricated by replacing the gate dielectrics with electrolytes are called electric
double layer transistors (EDLTs), which have realized varieties of gate-induced electronic phase
transitions. Electronic phase transition, including superconductivity, ferromagnetism, and
Mott-Hubbard transitions have been conventionally investigated by the chemical means adjusting
the carrier density. Now we are able to control them on a single devices simply by applying gate
voltages in EDLTs [1-3]. Also, we were successful in demonstrating that EDLT can be used for the
circularly polarized light source [4] and optimization of thermoelectric performances [5].
These developments indicate that iontronics has a great potential for creating new physical properties,
concepts [6], functionalities [7], and even applications, providing another piece of evidence
for the importance of interdisciplinary researches.

[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] Y. J. Zhang et al., Science 344, 725 (2014).
[5] S. Shimizu et al., PNAS 113, 6438 (2016).
[6] Y. Saito et al., Nat. Rev. Mater. 2, 16094 (2016).
[7] M. Kawasaki and Y. Iwasa, Nature 489, 510 (2012).


Update: 2017/3/24
Contacts: Li-Chun Chen

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