Xiaomin REN
Beijing University of Posts and Telecommunications, China
Title : Novel Understanding of Electron States Architecture and Its Dimensionality in Semiconductors
Abstract :

Some important insights into the electron-states-architecture (ESA) and its dimensionality (from 3 to 0) in a semiconductor (or generally crystalline) material are obtained. The self-consistency of the density of states (DOS) expressions for different dimensionalities as a whole is remediated through the clarification and rearrangement of the wave-function boundary conditions for solving the eigenvalues in the wave vector space. The actually ignored and theoretically unpredicted critical points for the dimensionality transitions referring to the integer ones are revealed upon an unusual assumption of the intrinsic energy-level dispersion (ELD). The ELD based quantitative physical model has been established and a proper follow-up modification has been done. The uncertainty regarding the relationship between the de Broglie wavelength of electrons and the dimensionality transitions, seeming somewhat mysterious before, is consequentially eliminated. The effect of the material dimensions on the ELD width is also predicted and has been included in the model. The continuous evolution of the ESA dimensionality is convincingly and comprehensively interpreted and thus a new area, the area of the fractional ESA dimensionality, is opened. More basically, the concept of the wave-spectrum function is proposed and consequently the signification of Schrödinger’s equation is generalized. This work leads to a new quantum mechanical picture and would manifest itself a new basis for further development of nanoheterostructures (or low dimensional heterostructures including the quantum wells, quantum wires, quantum dots and especially the hetero-dimensional structures). Expected should also be the possible inventions of some novel electronic and optoelectronic devices.

Biography :

Xiaomin REN IET Fellow; Professor and Vice President of Beijing University of Posts and Telecommunications (BUPT), Beijing, China; Director of the State Key laboratory of Information Photonics and Optical Communictions at BUPT; Standing Director of Chinese Optical Society; Associate Editor of IEEE/OSA Journal of Lightwave Technology (USA). He received his Ph.D. degree in Electronic Science and Technology (Photonics and Optial Communications) from BUPT in 1989. During 1994 to 1996, he worked first as a Senior Visiting Scholar in Centro Studi E Laboratori Telecomunicazioni, Turin, Italy, and then as a Visiting Senior Research Fellow in the Microelectronics Research Center, University of Texas at Austin. He was a winner of the National Outstanding Young Scientist Fund (NNSF, China) in the year of 1996. He served for a period from 1998 to 2011 as Deputy Head or Member of the relevent National 863 Expert Groups (personally in charge of the researches regarding optoelectronics ), first in the Information Area and then in the New Materials Area, under the National 863 (High Tech) Program of China. He has been the Chief Scientist of the National 973 Research Projects (twice, one initial and one continued) on optoelectronics since 2003 under the National 973 (Basic Research) Program of China. He has also been an executive director of Zh. I. Alferov Russian-Chinese Joint Laboratory of Information Optoelectronics and Nanoheterostructures under the direct leadership of Nobel Laureate, Prof. Zh. I. Alferov. His research interests include novel III-V semiconductor nanoheterostructures, high quality metamorphic epitaxy of semiconductor materials, new compatible material systems for heterogeneous integrations, novel semiconductor/fiber based microstructures and optoelectronic devices, Integrated optoelectronics (PIC and OEIC) and advanced optical communication technologies.

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