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Acknowledgements

The research presented in this thesis was conducted during my Doctor’s course in the

Gonokami-Yumoto-Ideguchi Group within the Department of Physics, Graduate School of

Science in the University of Tokyo. I am honored to have had the opportunity to work in such

a professional, active, and friendly group. The abundant diversity in research directions present

in the group provided me unique opportunity to access different field of researches. I believe

that the knowledge and the way of scientific thinking I learnt during my years in the University

of Tokyo will provide me great guidance in the future.

It has been a great privilege to work with Prof. Kosuke Yoshioka, Prof. Makoto KuwataGonokami, Prof. Junji Yumoto and Prof. Takuro Ideguchi.

I must thank my supervisor, Prof. Yoshioka, for overseeing my research while being

extremely busy operating his own group. He provided me great help in my experimental

direction with his keen vision. I am deeply appreciative of his detailed suggestions to the

creation of this thesis. I must also thank him for giving me unforsaken advices and

encouragements during this unusual year.

Prof. Gonokami, despite being busy as the head of the University, has been actively engaged

in the research conducted in the group. I am really surprised at his vast knowledge across a

wide field of researches and his ability to give useful and precise advices. I am especially

grateful for his advice on how I should interpret the result of this thesis.

I would like to send my most sincere gratitude to my direct overseer, Dr. Munekazu

Horikoshi. He provided me countless help during my experiments with his advanced knowhow and outstanding skills. Without his crucial advices on data processing, the work in this

thesis cannot be done. Congratulations on his new job as professor! I wish Horikoshi-san every

success in his new position.

Though not directly involved in my research, I appreciate the friendliness of Prof. Yumoto

and Prof. Ideguchi. The life stories of Prof. Yumoto have always been enjoyable and Prof.

Ideguchi’s knowledge towards pop culture sparked many delightful conversations.

I shall also thank the group staffs for providing me with accurate information and timing

suggestions. They had made my life much easier.

The rest adorable members of the group deserve a heartful thanks for being productive

colleagues and good friends. They were indispensable for my pleasant years at the University

of Tokyo.

42

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