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
讲座人: Masahiro Yamashita
形式:
校区: 兴庆校区
实践学分:
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.  
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