2017 Fiscal Year Annual Research Report
| Project/Area Number |
16F16325
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| Research Institution | Tohoku University |
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Principal Investigator |
Bauer Gerrit 東北大学, 金属材料研究所, 教授 (10620213)
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| Co-Investigator(Kenkyū-buntansha) |
ELYASI MEHRDAD 東北大学, 金属材料研究所, 外国人特別研究員
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| Project Period (FY) |
2016-11-07 – 2019-03-31
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| Keywords | Magnon / Cavity / Optical / Microwave / Nonlinearity / Non-classical / Soliton / Topology |
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| Outline of Annual Research Achievements |
The concept of nonlinearity in the optomagnonic systems for both microwave and optical photons were developed. Different aspects of the problem, including the transmission/reflection spectra, noise, and density matrix were addressed and the results of the study have been written in a manuscript titled “Cavity magnonics in the nonlinear regime” authored by M. Elyasi, Ya. M. Blanter, and G. E. W. Bauer, and is in last stages of preparation. The main conclusions are that considering beyond the uniform magnon mode in the magnonic mode dispersion is necessary, and it leads to unique transmission/reflection spectra, modifies the noise characteristics, and in a certain region of the parameter space can lead to non-classical states which is highly desired for quantum computation purposes.
In addition, the concept of magnonic solitons (nonlinearity induced self-localized modes) was assessed in topological magnonic lattices and the results are being prepared in a manuscript titled “Magnonic solitons in topologically nontrivial gaps”, authored by M. Elyasi, K. Sato, and G. E. W. Bauer. The results demonstrate the phase diagram of soliton existence using self-consistency calculations in static and time-periodic lattices.
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| Current Status of Research Progress |
Current Status of Research Progress
3: Progress in research has been slightly delayed.
Reason
The focus of the studies shifted to nonlinearities in microwave cavity- opto-magnonics, as based on my studies I realized that it was a promising route for the goals of the main subject of my research ‘coherence in magnonics’. This notion is confirmed by our results to be published. Regarding the publications, I am behind the schedule, but as noted above two manuscripts are currently in the last stages of preparation for submission to Physical Review series.
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| Strategy for Future Research Activity |
The non-classicality predicted in the cavity magnonic system as described in our under preparation manuscript “Cavity magnonics in the nonlinear regime” is being elaborated to larger extents using mathematical tools such as laser theory and entanglement measures for continuous variable quantum states, as well as numerical tools such as quantum Monte-Carlo simulations. The results will be prepared as a manuscript for journal submission. The work on the magnonic solitons will be implemented in the optomagnonic context to increase the coupling of microwave magnons to optical photns which is currently weak. We are planning possible experiments for observation of our findings of the last year. We also have a proposal based on our findings, to explore magnonic Bose-Einstein condensation in the quantum context in the cavity magnonic systems with using Raman-like couplings in the magnetostatic manifold of the magnonic dispersion of a spherical magnet. Currently, we are assessing the idea and planning the proper stages to be taken.
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Research Products
(7 results)
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[Journal Article] Room temperature magnetization switching in topological insulator-ferromagnet heterostructures by spin-orbit torques2017
Author(s)
Y. Wang, D. Zhu, Y. Wu, Y. Yang, J. Yu, R. Ramaswamy, R. Mishra, S. Shi, M. Elyasi, K.-L. Teo, Y. Wu, and H. Yang
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Journal Title
Nat. Commun
Volume: 8
Pages: 1364/1-6
DOI
Peer Reviewed / Int'l Joint Research
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