15:30-16:15

Mesoscopic Superconductivity

We are working on mesoscopic superconductivity that is the field of investigating superconducting physical phenomena in mesoscopic scale. This field is very important and interesting from both point of view of fundamental physics and applications. The key technology in this field is the contact between superconductor and other materials, e.g., quantum dot. In this talk we discuss three subjects; Andreev polaron, InAs-quantum dot-coupled SQUID and graphene SQUID. Physics behind theses three subject are Andreev reflection and superconducting proximity effect.

Speaker

Dr. Hideaki Takayanagi, MANA Satelite PI, Tokyo University of Science

Dr. Sunmi Kim, MANA Research Associate, MANA, NIMS

Dr. Kohei Tsumura, MANA Research Associate, MANA, NIMS

Chair

Dr. Masakazu Aono, MasakazuAono(MANA Director-General, MANA, NIMS

16:15-16:45

Colloidal Si Nanoparticles: Solution Synthesis, Characterization, and Spectroscopy

The optical use of colloidal silicon nanocrystals (Si NCs) has gained increasing attention for its possible contributions to building a sustainable society that ideally uses resources and energy with high efficiency without causing damage to the environment or human health. Si wafers (Eg ~1.1 eV) dominate modern microelectronics as an impressive electronic material, but they exhibit relatively poor optical performance owing to an indirect bandgap structure. Interestingly, however, full control of the size distribution and surface chemistry of the NCs yields size-dependent light emission in a very wide range from near-ultraviolet through visible to near-infrared wavelengths. In addition to such unique luminescence properties, Si exhibits a high chemical affinity to covalent linkages with carbon, oxygen, and nitrogen, thereby producing almost unlimited variations in organic/Si NCs architectures hybridized at the molecular level.

This presentation will describe some parameters for giving efficient photoluminescence from Si NCs, and cover new aspects of derivatives of Si NCs in potential applications.

Speaker

Dr. Naoto Shirahata, MANA Independent Scientist, MANA, NIMS

Chair

Dr. Yoshio Bando, MANA Chief Operating Officer, MANA, NIMS