451 citations
- The University of TokyoJP34 papers
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- Waseda UniversityJP13 papers
- Fujitsu (China)CN12 papers
- Japan Science and Technology AgencyJP12 papers
- RIKEN Center for Advanced PhotonicsJP9 papers
- National Institute of Advanced Industrial Science and TechnologyJP8 papers
- RIKEN Center for Quantum Computing8 papers
- Hiroshima UniversityJP7 papers
- Hokkaido UniversityJP6 papers
- Kyoto UniversityJP6 papers
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9 papers · 1 filter
Unusually high-density 2D electron gases in N-polar AlGaN/GaN heterostructures with GaN/AlN superlattice back barriers grown on sapphire substrates
Maciej Matys, Atsushi Yamada, Toshihiro Ohki
We reported on the observation of extremely high-density (cm) 2D electron gas in N-polar AlGaN/GaN heterostructures grown on sapphire substrates. Due to introducin…
Microwave-to-Optical Quantum Transduction Utilizing the Topological Faraday Effect of Topological Insulator Heterostructures
Akihiko Sekine, Mari Ohfuchi, Yoshiyasu Doi
The quantum transduction between microwave and optical photons is essential for realizing scalable quantum computers with superconducting qubits. Due to the large frequency differe…
Gate-defined Josephson weak-links in monolayer
Michael D. Randle, Masayuki Hosoda, Russell S. Deacon +9
Systems combining superconductors with topological insulators offer a platform for the study of Majorana bound states and a possible route to realize fault tolerant topological qua…
Emergent One-Dimensional Helical Channel in Higher-Order Topological Insulators with Step Edges
Akihiko Sekine, Manabu Ohtomo, Kenichi Kawaguchi +1
We study theoretically the electronic structure of three-dimensional (3D) higher-order topological insulators in the presence of step edges. We numerically find that a 1D conductin…
Electronic properties of the steps in bilayer Td-WTe2
Mari Ohfuchi, Akihiko Sekine, Manabu Ohtomo +1
Monolayer WTe2 stripes are quantum spin Hall (QSH) insulators. Density functional theory was used for investigating the electronic properties of the stripes and steps in bilayer Td…
Magnetic induction dependence of the dispersion of magnetoplasmon in a two-dimensional electron gas with finite layer thickness
T. Uchida, N. Hiraiwa, K. Yamada +2
Magnetic induction dependence of the dispersion of longitudinal magnetoplasmon in a two-dimensional electron gas with finite layer thickness under a static uniform magnetic field n…