Project/Area Number  10640312 
Research Category 
GrantinAid for Scientific Research (C).

Section  一般 
Research Field 
固体物性I(光物性・半導体・誘電体)

Research Institution  Yamaguchi University 
Principal Investigator 
MATSUURA Mitsuru Yamaguchi University, Fac. Of Engineering, Professor, 工学部, 教授 (60091211)

CoInvestigator(Kenkyūbuntansha) 
KURISU Hiroko Yamaguchi University, Fac. Of Engineering, Research Associate, 工学部, 助手 (00253170)

Project Fiscal Year 
1998 – 1999

Project Status 
Completed(Fiscal Year 1999)

Budget Amount *help 
¥3,400,000 (Direct Cost : ¥3,400,000)
Fiscal Year 1999 : ¥700,000 (Direct Cost : ¥700,000)
Fiscal Year 1998 : ¥2,700,000 (Direct Cost : ¥2,700,000)

Keywords  Quantum wells / Quantum dots / Exciton / Polaron / Mixed crystals / LO phonon / Biexciton / Optical properties / 量子井戸 / 量子ドット / 励起子 / ポーラロン / 混晶 / LOフォノン / 励起子分子 / 光学的性質 / ポーラロン効果 
Research Abstract 
(1) Polaron effects on an exciton in quantum well with an infinite potential barrier and a finite one are calculated and discussed. Role of the bulktype and the interfacetype phonon changes according to the large to small well width, which reflects the dimensional character of an exciton. (2) LO phonons and electronLO phonon interaction in mixed polar crystals are formulated. Selfenergy shift and effetvie mass correction are calculated. Also LO phonons (bulk and interface type) and electronLO phonon interaction in quantum well consisting of mixed polar crystals are formulated and are shown to be divided into three types according to whether the well or the barrier is made of mixed crystals. Polaron energy shifts are calculated in various systems. Moreover polaron effects on exciton in quantum well consisting of mixed polar crystals are calculated and are discussed in relation to the wellwidth dependence and the contribution of the various LO phonon modes on properties such as exci
… More
tonLO phonon interaction and exciton polaron energy shift. Specially the method is applied to the interesting quantum well systems consisting of mixed polar crystals with the use of qallium nitride or zinc compounds. (3)Effects of LO phonons (bulk and interface type) for an electron, confined in a spherical quantum dot embedded in a nonpolar matrix are studied theoretically. The variational method is developed to provide the results, being valid for the wide range of the dot radius and the electronLO phonon coupling strength. Also the size dependence of polaron effects on an exciton in a spherical quantum dot is studied by using a variational method. Exciton energy, excitonphonon interaction energy and the virtual phonon number are calculated. It is clearly shown that polaron effects on an exciton vanish in the limit of the small quantum dot. (4)CuCl microcrystals embedded in an SiOィイD22ィエD2 matrix is prepared by an novel RFmagnetoron sputtering combined with an inductively coupled plasma. Optical properties (absorption and luminescence spectra) of the exciton and the biexciton in the system are investigated. In the luminescence spectra intensities of the exciton and the biexciton have linear and superlinear dependencies, respectively. Less
