Overview of Material Science Research

Masao Morita
Materials Science Laboratory

 The Materials Science Laboratory (MSL) aims at producing new materials by controlling arrangement of atoms and bonding of molecular for new functions using quantum phenomena and so on. To accomplish these goals from different perspectives the following four MSL groups are formed and are studying many kinds of materials ranging from inorganic matter, such as semiconductors, to organic matter, such as neurotransmitters. The characteristic feature of MSL is the effective sharing of the unique nanofabrication and measurement techniques of each group. This enables fusion of research fields and techniques, which leads to innovative material research for the IT society.

Molecular and Bio-Science Research Group
Create new organic materials by manipulating single molecules, and investigate information processing devices based on neural functions.

Superconducting Thin Films Research Group
Study high-Tc superconductors by fabricating top quality samples through the molecular beam epitaxy(MBE) method and develop its applications to microwave communication.

Superconducting Quantum Physics Research Group
Investigate theoretical and experimental research on a quantum computers superconductors and new magnetic devices using quantum dot arrays.

Spintronics Research Group
Aim to control the spin degrees of freedom in semiconductors to achieve new device functions for the next generation electronics.
  The following are four major results obtained in the fiscal year 2003.
1. The carrier transport and injection properties of conductive organic polymer with different dimensions and configurations were studied, and it was found that the carrier injection is dominated by the tunneling process at the nano-gap electrode.
2. Non-doped superconductors in lanthanum based copper oxide were discovered, though it has been believed that the non-doped parent materials of high-Tc superconductors are Mott insulators.
3. Multiphoton transitions between the superposition states in the superconducting flux qubit were observed. The microwave power dependences of the half width at half maxima of the resonant dips were well reproduced by Bloch equations based on a dressed-atom description. From this analysis, the qubit coherence time is estimated to be 5 ns.
4. The magnetization processes of micro-structured ferromagnetic rings were investigated using the local Hall effect device and it was found that the magnetic transition strongly depends on the inner diameter of the ring.

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