Abstract of talk:
The Josephson effect provides a unique principle to excite terahertz electromagnetic waves. Generation of powerful and coherent EM waves has been achieved recently after 50-year effort based on a mesa of single crystal of BSCCO high-Tc superconductor (Science, 318 (2007) 1291). We have investigated theoretically the stack of intrinsic Josephson junctions, and found a new state of the inductively coupled sine-Gordon equations (PRL 100 (2008) 247006). It is clarified that this pi-kink state is realized by the nano-scale layered structure of cuprates, and permits large dc energy to be converted into terahertz radiation. The back ground, advantages and challenges in developing superconductivity-based Laser will be discussed.
报告人介绍:
胡晓教授毕业于日本东京大学理学院本科(1985年)、硕士(1987年)、博士(1991年)。1991年,在日本东北大学材料研究所任助理教授;1995年,在美国国家标准技术研究院(NIST) 任客座研究员;1996年,在日本东北大学 材料研究所任副教授;1996年,在日本国家金属材料技术研究所任资深研究员;2002年,在日本国家物质材料研究机构任强关联研究组主管;2007年,在日本筑波大学 纯和应用科学研究生院教授;2007年,或世界最高研究中心(WPI)计划,物质纳米结构学国际研究中心 PI。 |