Two-photon generation of excitonic molecules in CuCl: An exactly solvable bipolariton model and high-precision experiments.
Two-photon generation of excitonic molecules in CuCl: An exactly solvable bipolariton model and high-precision experiments.
复制标题
CuCl 中激子分子的双光子生成：精确可解的双极化子模型和高精度实验。
DOI：
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发表时间：
1995
期刊：
影响因子：
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通讯作者：
H. Haug
中科院分区：
文献类型：
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作者：
A. L. Ivanov;M. Hasuo;N. Nagasawa;H. Haug
The conventional giant oscillator strength model of the two-photon (ensuremath{gamma}) generation of an excitonic molecule (m) attributes this process to the x-ensuremath{gamma} optical conversion (where x is the exciton) i.e, to the scheme ensuremath{gamma}+ensuremath{gamma}ensuremath{
ightarrow}x+ensuremath{gamma}ensuremath{
ightarrow}m. Recenty [A.L. Ivanov and H. Haug, Phys. Rev. B 48, 1490 (1993)], it was argued that a more adequate description can be done within the bipolariton model which follows the other scenario: ensuremath{gamma}+ensuremath{gamma}ensuremath{
ightarrow}x+xensuremath{
ightarrow}m, where the Coulombic resonant coupling of the x components of the two interacting polaritons gives rise to the m formation. In the present work, we develop and analyze for the deuteron potential of an x-x interaction an exactly solvable bipolariton model of the two-ensuremath{gamma} m generation. This model treats an m optical creation in terms of the polariton-polariton resonant scattering and includes both the x-y polariton coupling and the x-x attraction beyond a low-order perturbation theory. The bipolariton model and the giant oscillator strength model give different descriptions of the third-order m nonlinear optical susceptibility ${mathrm{ensuremath{chi}}}^{(3)}$ and of the two-ensuremath{gamma} m absorption. With the high-precision measurements in CuCl of the m radiative width ${mathrm{ensuremath{Gamma}}}^{mathit{m}}$, ${mathrm{ensuremath{chi}}}^{(3)}$, and the two-ensuremath{gamma} m absorption coefficient ${mathit{K}}^{(2)}$, we make a systematic comparison between the experiments and the two models, which allows us to unambiguously discriminate both models in favor of the bipolariton one.
The conventional giant oscillator strength model of the two-photon (ensuremath{gamma}) generation of an excitonic molecule (m) attributes this process to the x-ensuremath{gamma} optical conversion (where x is the exciton) i.e, to the scheme ensuremath{gamma}+ensuremath{gamma}ensuremath{
ightarrow}x+ensuremath{gamma}ensuremath{
ightarrow}m. Recenty [A.L. Ivanov and H. Haug, Phys. Rev. B 48, 1490 (1993)], it was argued that a more adequate description can be done within the bipolariton model which follows the other scenario: ensuremath{gamma}+ensuremath{gamma}ensuremath{
ightarrow}x+xensuremath{
ightarrow}m, where the Coulombic resonant coupling of the x components of the two interacting polaritons gives rise to the m formation. In the present work, we develop and analyze for the deuteron potential of an x-x interaction an exactly solvable bipolariton model of the two-ensuremath{gamma} m generation. This model treats an m optical creation in terms of the polariton-polariton resonant scattering and includes both the x-y polariton coupling and the x-x attraction beyond a low-order perturbation theory. The bipolariton model and the giant oscillator strength model give different descriptions of the third-order m nonlinear optical susceptibility ${mathrm{ensuremath{chi}}}^{(3)}$ and of the two-ensuremath{gamma} m absorption. With the high-precision measurements in CuCl of the m radiative width ${mathrm{ensuremath{Gamma}}}^{mathit{m}}$, ${mathrm{ensuremath{chi}}}^{(3)}$, and the two-ensuremath{gamma} m absorption coefficient ${mathit{K}}^{(2)}$, we make a systematic comparison between the experiments and the two models, which allows us to unambiguously discriminate both models in favor of the bipolariton one.