Hiroshi Irie

Research scientist, NTT Basic Research Laboratories

Field of Specialty：

Superconductor/Semiconductor hybrid devices (Experiment)

Topics of Research：

(A01) Novel Edge Phenomena in Superconductors with Broken Time-Reversal Symmetry

Specific Topics：

Spin-triplet Cooper pair at superconductor/ferromagnet interface

■ Laboratory Website　

RESEARCH

At the interface of a ferromagnet/supercondutor junction, spin-triplet pairing state is predicted to be induced due to a combination of the superconducting proximity effect and the exchange interaction in the ferromagnet. We are especially interested in the equal spin spin-triplet state, which is compatible with the ferromagnetic correlation unlike the conventional spin-singlet superconducting state. With the advent of such novel quantum phase, emerging research field including superconducting spintronics can be realized, where the superconducting correlation is manipulated by the spin-degree of freedom and vice versa.

In this project, we aim to generate the equal spin state at the interface of an (In,Mn)As/Nb junction. Local control of the magnetization vector by means of the mechanical strain is performed for a noncollinear magnetization in the (In,Mn)As, one of the essential conditions to generate the equal spin state. Demonstration of the long range propagation in the ferromagnetic material is the next challenge, once the existence of the equal spin state is confirmed.

EDUCATION

2003

B.Eng. in Materials Engineering, University of Tokyo

2005

M.Eng. in Materials Engineering, University of Tokyo

2010

Ph.D. in Electrical Engineering, University of Rochester, NY

PROFESSIONAL EXPERIENCE

2010-2012

Research Associate, NTT Basic Research Laboratories

2012-Present

Research scientist, NTT Basic Research Laboratories

SELECTION OF PUBLICATIONS