The 307th MANA Seminar
Dr. Bo Shen & Dr. Ryousuke Jinnouchi
Date | January 25, Friday |
Time | 15:30-17:00 |
Place | Auditorium, 1F, WPI - MANA Building, Namiki Site, NIMS |
Download PDF file for seminar info.
15:30-16:15
Epitaxial growth and spin properties of III-nitride semiconductor low dimensional quantum structures
Strong polarization-induced electric fields and large conduction-band offset make III-nitride semiconductor low dimensional quantum structures (heterostructures and quantum wells) have significant different physical properties from other III-V ones. Well understanding on these properties is the basis for the fabrication and improvement of III-nitride devices. In this talk, the MOCVD and MBE epitaxial growth of GaN-based heterostructures and InN films of high quality will be introduced firstly. Then, the spin properties based on the spin-orbit coupling in these low dimensional quantum structures will be discussed in detail, including the zero-field spin splitting, circular photogalvanic effect (CPGE), reciprocal spin Hall effect (RSHE), and photo-induced anomalous Hall effect (AHE) .
Speaker
Dr. Bo Shen, Research Center of Wide Bandgap Semiconductors, School of Physics, Peking University, China
Chair
Dr. Yoshio Bando, MANA COO, MANA, NIMS
16:15-17:00
DFT modified Poisson-Boltzmann calculations on electrode reactions in fuel cells technology
This short talk presents a theory for electrified liquid-solid interfaces we have developed, which employs the density functional theory and a modified Poisson-Boltzmann theory for describing Helmholtz layers and diffusion layers in long-ranged electric double layers, respectively. After a brief description on the equations and models used in this theory, results are presented on applications to electro-oxidation of Pt surfaces, specific adsorption of sulfuric acid anion and underpotential deposition of Cu. Those results show that the theory can predict, with a useful accuracy, the reversible potentials of electron transfer reactions in both non-adsorbed and adsorbed phases.
Speaker
Dr. Ryousuke Jinnouchi, Electrochemistry Div., Toyota Central R&D Labs., INC., Japan
Chair
Dr. Yoshitaka Tateyama, Group Leader, MANA, NIMS