[Topology] Year Started : 2019

Satoshi Iwamoto

Creation of topological integrated photonic devices

Research Director
Satoshi Iwamoto

Professor
Research Center for Advanced Science and Technology
The University of Tokyo

Collaborator
Nobukiyo Kobayashi Director
Research & Development Department, Department of Creation of New Materials
Research Institute for Electromagnetic Materials
Shun Takahashi Assistant Professor
Electrical Engineering and Electronics
Kyoto Institute of Technology
Outline

By fusing integrated photonics technology and the concept of topology, we will realize novel topological integrated photonic devices such as unidirectional waveguides using a chiral edge state at telecommunication wavelengths, skyrmion lasers, and so on. We will also realize various topological states of light by fully taking the advantages of integrated photonics technology and explore their potential applications. Through these studies, we will form a mutual link between topological science and photonics, and contribute to the creation of new optical technologies and the progress in topological science.

Yasuyuki Kawahigashi

Theoretical studies of topological phases of matter

Research Director
Yasuyuki Kawahigashi

Professor
Graduate School of Mathematical Sciences
The University of Tokyo

Collaborator
Masatoshi Sato Professor
Yukawa Institute for Theoretical Physics
Kyoto University
Akira Furusaki Chief Scientist
Cluster for Pioneering Research
RIKEN
Outline

Effectiveness of mathematical methods in studies of topological phases is clear, but we have not grasped their total pictures. In this project, mathematicians and theoretical physicists work together to establish universal theory of topological phases aimed at a wide range of systems of matter and give a basis of development of materials and devices in new dimensions. We believe this study will be useful for research of mathematical and physical fundamental theories of topological quantum computers.

Ryo Shimano

New Developments of Topological Nonlinear Optics

Research Director
Ryo Shimano

Professor
Cryogenic Research Center
The University of Tokyo

Collaborator
Takashi Oka Professor
The Institute for Solid State Physics
The University of Tokyo
Masamitsu Hayashi Associate Professor
Graduate School of Science
The University of Tokyo
Outline

We investigate nonlinear optical responses that arise from the topological phase (Berry phase) of electrons in quantum materials for their application to the novel photo electronics. Circular photo-galvanic effect and shift current in topological materials will be studied by combining the transport and optical measurements. With aid of Floquet engineering, the fundamental concept of topological nonlinear optics will be extended to spin-current phenomena, nonlinear optics in superconductors and strongly correlates electron systems.

Tetsuo Deguchi

Innovative topological theory of polymer elasticity based on homology and its application to molecular devices through ring-polymer mixture

Research Director
Tetsuo Deguchi

Professor
Faculty of Core Research
Ochanomizu University

Collaborator
Toshifumi Sato Professor
Faculty of Engineering
Hokkaido University
Hiroshi Jinnai Professor
Institute of Multidisciplinary Research for Advanced Materials
Tohoku University
Outline

In terms of homology theory we reconstruct the elastic theory of polymer networks at the fundamental level. We present a theoretical method for exactly evaluating the elastic constant of any given Gaussian polymer network from its network structure. Applying it, we study systematically the mechanical responses of various gels and rubbers. We synthesize ring polymers and mix them with linear polymers to make novel elastic materials in which ring polymers would act mobile junctions. Scattering experiments, mechanical measurements based on rheology and strain stress curves, and 3D observations through electron microscopes will be performed on the mixtures of ring and linear polymers. Based on such knowledge, we aim to derive molecular devices as engineering applications.

Yuji Matsuda

Direct detection of topological quasiparticles in a quantum spin liquid

Research Director
Yuji Matsuda

Professor
Department of Physics
Kyoto University

Collaborator
Takasada Sibauchi Professor
Department of Advanced Materials Science
The University of Tokyo
Satoshi Fujimoto Professor
Department of Materials Engineering Science
Osaka University
Outline

Majorana fermions and non-Abelian anyons originating from topological structures of materials are key particles for realizing fault-tolerant topological quantum computing. Recently, it has been demonstrated that insulating magnets in a Kitaev quantum spin liquid state (Kitaev magnets) host these emergent topological quasiparticles. We will thoroughly clarify the fundamental topological properties of the Kitaev magnets and explore novel electronic phases, such as topological superconductivity. Moreovre, we will establish the technique for topological quantum computing by direct detection and visualization of the emergent topological quasiparticles.

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