1. 제 목 : Two-dimensional electron system in AlGaN/GaN eterostructure :
energy spectrum, transport and magnetotranspor
2. 발표자 : 권제동 박사(Novosibirsk State University)
3. 일 시 : 2006년 2월 13일(월) 14:00
4. 장 소 : 경북대 공대 11호관 103호
5. 초청교수 : 이 정희 교수
6. 강사약력
1973 : Novosibirsk State University // M.Sc.
1980 : The Institute of Semiconductor Physics Russian Academy of
Sciences // Ph.D
1991 : The Institute of Semiconductor Physics Russian Academy of
Sciences // Doctor of Science in Physics
1986 ~ Novosibirsk State University
// Professor, the Physics Department
7. 내용요약 :
The talk is devoted to the properties of two-dimensional electron system (2DES) in AlGaN/GaN. Its subjects are the following. Energy spectrum and density of states of a three dimensional electron gas in bulk semiconductors. Size quantization effect. Quantum wells. Self-consistent quantum wells. Energy spectrum and density of states of a two-dimensional electron gas. Three kinds of 2DES (MOSFETs, AlGaAs/GaAs and AlGaN/GaN heterostructues) three ways to get 2D electrons. Energy spectrum of the electrons in GaN. Size quantization in self-consistent quantum well near AlGaN/GaN interface. Distance between subbbands. Effective mass of 2D electrons. Nonparabolicity. Fermi energy values. Conductivity of a two-dimensional metal. Transport time. Mean free path. Mobility. Impurity, phonon and roughness scattering. Scattering at low temperatures (charge impurity and roughness). Main scattering mechanisms in 2DEG in KNU AlGaN/GaN heterostructures. How to measure magnetoresistanse and Hall effect. Hall bar. Magnetoresistivity tensors. Corbino disk-like and Van der Pauw geometries. Quantizing magnetic field. Landau levels. Shubnikov de Haas oscillations (SdH). How to find electron density from SdH oscillations measurements. Quantum life time. SdH oscillations in KNU samples.
8. 주최 : BK21 정보기술연구사업단, 반도체공정교육 및 지원센터,
전자전기컴퓨터학부
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