Tokyo Tech News
Tokyo Tech Bulletin is an email newsletter introducing Tokyo Tech's research, education, and students' activities. The latest edition, "Tokyo Tech Bulletin No. 49," has been published.
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For some materials, light can induce a change in state through a process known as photo-induced phase transition. This phenomenon has attracted global attention as a pathway to replacing current electronic devices with ultrafast, low-energy, optical devices.
GSEP, Tokyo Tech's first international Bachelor of Engineering degree program run by Transdisciplinary Science and Engineering (TSE) provides rare opportunities for students to gain valuable hands-on experience in sustainable development and many other issues of global concern. Now, as the program enters its third year, current students of GSEP and TSE, and faculty members provide an inside view of the program and describe the advantages of transdisciplinary learning.
Each issue of the journal Nature Electronics contains a column called "Reverse Engineering," which examines the development of an electronic device now in widespread use from the viewpoint of the main inventor. So far, it has featured creations such as the DRAM, DVD, CD, and Li-ion rechargeable battery. The July 2018 column tells the story of the IGZO thin film transistor (TFT) through the eyes of Professor Hideo Hosono of Tokyo Tech's Institute of Innovative Research (IIR), who is also director of the Materials Research Center for Element Strategy.
ELSI's contribution to early Mars research centers on water, and the key and much-debated question of how much of it might have been present and free-flowing on the surface 3 to 4 billion years ago. ELSI of Tokyo Tech, associate principal investigator Tomohiro Usui, an expert in geo and cosmo chemistry, has been working for several years on the question of how much water was present on early Mars.
A combination of materials that reduces energy loss in organic solar cells has been identified by Tokyo Tech researchers.
A Tokyo Tech research team has shown copper nitride acts as an n-type semiconductor, with p-type conduction provided by fluorine doping, utilizing a unique nitriding technique applicable for mass production and a computational search for appropriate doping elements, as well as atomically resolved microscopy and electronic structure analysis using synchrotron radiation. These n-type and p-type copper nitride semiconductors could potentially replace the conventional toxic or rare materials in photovoltaic cells.
A step towards quantum memory. Ultrashort Light-pulse-induced vibrations of atoms in a lattice, called optical coherent phonons, have been controlled in various materials. However, different experiments demonstrating such control have been explained differently through empirical theories, and a unified theory based on quantum mechanics is lacking. Scientists at Tokyo Tech successfully formulated a unified theory for this phenomenon and experimentally verified it in diamond, the optical phonons of which have great potential for application in quantum information technology.