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General Abstract:

Professor Yamashita's research target has been “Next Generation Multifunctional Nano-Sciences on Advanced Metal Complexes”. His work encompasses four important key areas: (1) inorganic-organic hybrid electronic states, (2) nano-size and nano-space, (3) bottom-up and self-assembly, and (4) nonlinearity and quantum effects. Among them, nonlinearity and quantum effects are the most important for nano-sciences on advanced metal complexes. He has been working on these two topics (nonlinearity and quantum effects) at the same time for more than 40 years. He will give the 7 lectures on these topics in the special lectures.

Lecture (1):

“What is Science ? What is Nano-Science ?”

Professor Yamashita will give the lecture on what science is ?, and what nano-science is ?. These topics will include the history of nano-molecular magnets as well as the meaning of the science. Moreover, he will talk about the importance of the quantum effect and nonlinearity based on the nano-size from 1 to 100 nm. Finally, he will show that science should create the new research fields.

Lecture (2):

“Molecular Spin Qubits for Quantum Computer and Highly Density Memory Devices Based on Molecular Magnets”

     First, Professor Yamashita will give the talk about the molecular spin qubits for quantum computer from the viewpoints of three approaches such as [1] Crystal engineering method, [2] g-Tensor engineering method, and [3] Orbital engineering method. Next, he will give the talk about the single-molecule memory device, the metallic conducting single-molecule magnets (SMMs) with the negative magnetoresistance, the SMMs encapsulated in single-walled carbon nanotube (SWCNT) with the negative magnetoresistance and Coulomb blockade, and photo-switchable SMMs.

Lecture (3):

“Single-Chain Magnets (1D) and Nano-Dot Network Magnets (2D)”

     In this lecture, Professor Yamashita will focus on the dimensionality effects on SMMs (0D). The single-chain magnets (SCMs) (1D) are usually made by bridging SMMs with the bridging molecules. He will explain the effects of both the SMMs and the bridging molecules on the SCMs properties. Next, he will focus on the nano-dot network magnets (2D) and talk whether they show SCMs (1D) or the classical bulk magnets (3D).

Lecture (4):

“Kondo Effects on Single-Molecule Magnets”

     More than 50 years ago, Professor Kondo predicted that if the metallic materials include the small amount of the magnetic impurities, the metallic behaviors change to insulators by the combination of the conducting electron and localized magnetic impurity spin. From the beginning of the discovery of SMMs, most researchers noticed that SMMs should show Kondo Effects. However, nobody knew how to detect Kondo effects on SMMs. Professor Yamashita will talk the discovery of Kondo effects on SMMs by Scanning Tunneling Microscopy (STM) and their properties.

Lecture (5):

“Conducting Single-Molecule Magnets”

     Professor Yamashita discovered the conducting SMMs more than 10 years ago. However, the compounds did not show the negative magnetoresistance due to no interaction between the semiconducting electron and localized SMMs. However, more recently, he has discovered the metallic SMMs with the negative magnetoresistance for the first time. He will talk about the history and strategy of the conducting SMMs.

Lecture (6):

“Nano-Wire Pd(III) Mott-Insulators with Strong Electron-Correlation”

     Quasi-one-dimensional halogen-bridged metal complexes (MX-Chains) show the very interesting physical properties such as non-linear optical properties. Professor Yamashita has succeeded to synthesized Pd(III) Mott-Insulators for the first time according to the following strategies; [1] Shortening the Pd-Pd distance with counteranions with the long alkyl-chains (Chemical pressure methods), [2] Ni-Pd alloy method, [3] Weaker ligand field with cyclopentanediamine ligand, and [4] Multiple-hydrogen bonds methods. He will show the physical properties of these Pd(III) compounds such as their phase transitions, charge fluctuations, and charge separations.

Lecture (7):

“Nano-Wire Ni(III) Mott-Insulators and MMX-Chain Compounds”

     Professor Yamashita will give the talk about the gigantic third-order optical non-linearity as well as the electron- and hole-doping in Ni(III) Mott-Insulators with strong electron correlation. Next, he will talk about the Pt-Pt-X chain compounds with photo-switchable phase transitions.