1995 Fiscal Year Final Research Report Summary
Quantum plane Confinement effect of Exciton as an example of Boson Confinement
| Project/Area Number |
06452049
|
|---|
| Research Category |
Grant-in-Aid for General Scientific Research (B)
|
| Allocation Type | Single-year Grants |
|---|
| Research Field |
固体物性Ⅰ(光物性・半導体・誘電体)
|
|---|
| Research Institution | THE INSTITUTE OF PHYSICAL AND CHEMICAL RESEARCH |
|---|
Principal Investigator |
SEGAWA Yusaburo The Institute of Physical and Chemical Research・Photodynamics Research Center, Team Reader, フォトダイナミクス研究センター・光物性チーム, チームリーダー (30087473)
|
|---|
| Co-Investigator(Kenkyū-buntansha) |
YANASE Akihisa The Institute of Physical and Chemical Research・Photodynamics Research Center, F, フォトダイナミクス研究センター・光物性チーム, フロンティア研究員 (50231650)
|
|---|
| Project Period (FY) |
1994 – 1995
|
| Keywords | Exciton / Quantization / Confinement / CuCl / Optical Spectrum / Epitaxial / Thin Film |
|---|
| Research Abstract |
A study of quantized excitons in CuCl epitaxial thin films is reported. Film thickness (L) that are much smaller than the photon wavelength (lambda) is the medium (-160nm), but larger than the exciton Bohr radius a_B (-0.7nm), are considered here. Many structures have been observed in transmission and absorption spectra over the Z_3 exciton region. When L<30nm, these structures correspond well to the confined exciton levels with odd quantum number n. The oscillator strength for the nth quantized exciton is found to be proportional to L/n^2 for odd n and zero for even n. The absence of the states with even n in the optical spectra is interpreted in terms of the parity selection rule in the confined exciton system when the long-wavelength approximation holds. The measured optical spectra are compared with the additional-boundary condition-free response theory. Polariton-interference fringes given by the theory demonstrate a good agreement with the experimental results both for thick and thin films. By analyzing the absorption line shape, the dependence of nonradiative damping of the quantized exciton on quantum number n and film thickness L is discussed.
|
