| 研究課題/領域番号 |
19H00645
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| 研究機関 | 東北大学 |
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研究代表者 |
Bauer Gerrit 東北大学, 材料科学高等研究所, 教授 (10620213)
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| 研究分担者 |
佐藤 浩司 東北大学, 金属材料研究所, 助教 (70708114)
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| 研究期間 (年度) |
2019-04-01 – 2024-03-31
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| キーワード | Spintronics / magnonics / cavities / ferroelectrics |
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| 研究実績の概要 |
We propose to formulate and apply a comprehensive input-output scattering theory of a new form of matter, viz. a composite assembly of magnetic and other macroscopic objects in microwave cavities that are coupled by virtual exchange of cavity photons. A magnonic heterochemistry invokes added superconducting and/or ferroelectric elements. The collective dynamics can easily be driven into non-linearities, are quantized at low temperature, and can be read-out optically, electrically, and mechanically. Photon-bound multi(super)ferroics are predicted to allow microwave, electric, and optical long-distance information exchange and order parameter control.
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| 現在までの達成度 (区分) |
現在までの達成度 (区分)
1: 当初の計画以上に進展している
理由
In the past three years (2019-2021) we successfully realized many project objectives with results disseminated in 41 refereed publications with, among others, 9 Physical Review Letters (Web of Science). Here are some highlights.
(1)We arrived a comprehensive explanation of the semiclassical aspects of magnon chemistry in cavities and waves guides and the coupling of magnonic molecules to electromagnetic waves. We discovered among other effects unexpected new chiralities in the intermolecular spin and energy currents with possible applications as magnonic isolators and circulators.
(2)We contributed to the nascent field of quantum magnonics by predicting substantial quantum entanglement in many body magnon states that is distillable when coupled to microwave cavities. We applied these insights to the magnon parametron device and its p-pbit functionalities. We predicted “smoking gun” evidence for genuine macroscopic quantum effects that offer new functionalities in quantum information science.
(3)We opened a new research field that address the elementary excitations of ferroelectrics that we dubbed “ferronics”. The ferron excitations carry electric rather than magnetic dipoles and transport energy and polarization current, which provide entirely new strategies for heat management applications.
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| 今後の研究の推進方策 |
In the remaining two years we intend to continue to work on the above three subtopics listed above.
(1)We will address novel physics and control of magnons in cavities, such the eddy current cross talk with floating superconductors and the photon-induced non-local spin Seebeck effects.
(2)We assess the effects of magnon interactions on observables such as magnetic tunnel junction noise, frequency combs in NV-center microscopy, and propagating magnon spectroscopy, in close collaboration with experimentalists and will support experimental efforts in quantum magnonics.
(3)We will expand the field of ferronics by studying non-local ferron drag effects, two-dimensional ferroelectrics ferron polaritons and the coupling between ferron-magnon molecules in microwave and THz cavities.
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