Yasuhiko Arakawa Yasuhiko Arakawa Yasuhiko Arakawa (Japanese , "Arakawa Yasuhiko"; born 6 November 1952) is a Japanese physicist. His research focuses on semiconductor physics, including growth of nanostructures and their optoelectronic applications. Among his main achievements are the proposal of the concept of quantum dots and their application to quantum dot lasers, the observation of exciton-polariton Rabi-splitting in a semiconductor microcavity, or, recently, the first 3D photonic crystal nanocavity lasers with quantum dot gain. Yasuhiko Arakawa received a B.S. degree in 1975 and a Ph.D. degree in 1980, respectively, from the University of Tokyo, both in Electronics Engineering. In 1981 he became
Yamanote and Shitamachi certain "conflation" of the two terms, and those born in Shitamachi are typically considered true Edokko, children of Edo. This conflation is evident in the Edo period habit of saying "I am going to Edo" to mean going from the area around Fukagawa in Kōtō ward to anywhere east of the Sumida river. While the Yamanote grew west on the Musashino Plateau, in time the Shitamachi expanded east beyond the Arakawa river, and now includes the Chūō, Kōtō(Fukagawa), Sumida, and Taitō wards, plus part of Chiyoda ward. The center of Ueno in Taitō lies at the heart of the old