Y
Yoshiro Hirayama
Researcher at Tohoku University
Publications - 390
Citations - 6756
Yoshiro Hirayama is an academic researcher from Tohoku University. The author has contributed to research in topics: Quantum Hall effect & Magnetic field. The author has an hindex of 35, co-authored 390 publications receiving 6415 citations. Previous affiliations of Yoshiro Hirayama include Nippon Telegraph and Telephone & Center for Strategic and International Studies.
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Coherent manipulation of electronic States in a double quantum dot.
TL;DR: It is shown that coherent time evolution of charge states (pseudospin qubit) in a semiconductor double quantum dot is investigated with a high-speed voltage pulse that controls the energy and decoherence of the system.
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Allowed and forbidden transitions in artificial hydrogen and helium atoms
Toshimasa Fujisawa,David Guy Austing,David Guy Austing,Yasuhiro Tokura,Yoshiro Hirayama,Seigo Tarucha,Seigo Tarucha +6 more
TL;DR: Electrical pump-and-probe experiments that probe the allowed and ‘forbidden’ transitions between energy levels under phonon emission in quantum dots with one or two electrons find that the spin degree of freedom is well separated from the orbital degree offreedom, and that the total spin in the quantum dots is an excellent quantum number.
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Bidirectional Counting of Single Electrons
TL;DR: A comprehensive statistical analysis in the frequency and time domains and of higher order moments of noise reveals antibunching correlation in single-electron transport through the device itself.
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Controlled multiple quantum coherences of nuclear spins in a nanometre-scale device
TL;DR: A self-contained NMR semiconductor device that can control nuclear spins in a nanometre-scale region and enables the direct detection of multiple quantum coherences between levels separated by more than one quantum of spin angular momentum.
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Quantum Hall transition in real space: from localized to extended states.
Katsushi Hashimoto,Katsushi Hashimoto,Christoph Sohrmann,Jens Wiebe,Takeshi Inaoka,F. Meier,Yoshiro Hirayama,Rudolf A. Römer,Roland Wiesendanger,Markus Morgenstern +9 more
TL;DR: Using scanning tunneling spectroscopy in an ultrahigh vacuum at low temperature and high magnetic fields, electronic wave functions are probed across an integer quantum Hall transition to observe the evolution from localized drift states in the insulating phases to branched extended drift states at the quantum critical point.