New Quantum Molecular Spintronics Based on Single-Molecule Magnets: Single-Molecule Memory, Spin Qubits, and Coherence at RT.

讲座名称: New Quantum Molecular Spintronics Based on Single-Molecule Magnets: Single-Molecule Memory, Spin Qubits, and Coherence at RT.
讲座时间 2017-11-23
讲座地点 西二楼A102,曲江校区
讲座人 Masahiro Yamashita
讲座内容
讲座名称:New Quantum Molecular Spintronics Based on Single-Molecule Magnets: Single-Molecule Memory, Spin Qubits, and Coherence at RT. 
讲座时间:2017年11月23日,上午09:30
讲座地点:西二楼A102,曲江校区
讲座人:Professor Masahiro Yamashita(Tohoku University)
讲座内容:Spintronics is a key technology in the 21st century.  Magnetic random access memory (MRAM), which uses giant-magnetoresistance (GMR) or tunnelling-magnetoresistance (TMR), have several advantages over conventional systems. Although bulk or classical magnets composed of transition metals are normally used, in our study, we use Single-Molecule Magnets (SMMs) to overcome “Moore`s Limitation”. 
For realizing the single-molecule memory devices, first we sublimated Co bilayer (ferromagnet) on Au(111), then sublimated double-decker bis(phthalocyaninato)Tb(III) SMMs (TbPc2) on them.  By using spin-polarized STM with Co atom tip (paramagnet), we have succeeded to write and read the spin orientations on TbPc2 as up and down, respectively.
For realizing the quantum computer, the spin Qubits and coherence at room temperature are very important.  For this purpose, we synthesized porphyrin V(IV) complex (0D) and MOF-Porphyrin V(IV) complexes (2D and 3D).  The 0D-complex has a weak van der waals interaction, then no coherence is observed at room temperature due to the fast spin-lattice relaxation.  On the other hand, the 3D complex shows Rabi nutation even at room temperature due to the rigid lattice of MOF.  Therefore, the coherent spin manipulations in any arbitrary superposition of states is possible.  This system is so-called MOF-spintronics.

 

讲座人介绍

Masahiro Yamashita (山下正广),英国皇家化学学会院士、日本东北大学教授,兼任英国皇家化学会Dalton Transactions副主编、美国化学会无机化学专业顾问委员会成员、日本学术振兴会会员等职。日本井上科学基金会奖、日本化学学会创新工作奖、日本配位化学学会奖获得者。研究专长为新型金属配合物的纳米科学。已出版学术专著5部,在Nature, J. Am. Chem. Soc.等刊物发表研究论文300余篇,他引次数达5000多次。

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