Fano resonance of low-dimensional excitons

低维激子的法诺共振

• 批准号: 11640308
• 负责人: HINO Kenichi
• 金额: $ 2.5万
• 依托单位: University of Tsukuba
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 1999
• 资助国家: 日本
• 起止时间: 1999 至 2001
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-11640308/
• 关键词: exciton; low-demensinal semi conductor; Fano resonace; quantum well; superlattices; Wannier-Stark ladder; valence-band mixing; multi-channel scattering; 光吸収スペクトル; Wannier-Stark階段; 低次元励起子; 多チャンネル散乱理論; 重なり共鳴; Landau―Zenerモデル; 断熱展開

Fano resonance (FR) of low-dimensional excitons manifests itself due to couplings of subbands generated by spatial quantum confinement. The resulting FR states belong to multi-channel scattering (MCS) states. However, there were a lot of difficulties in conventional theoretical methods because of little account of MCS problems. In the present study, one has succeeded to overcome all of these problems and to establish a novel MCS theory of low-dimensional excitons, which enables us to evaluate natural spectra and resonance widths of FR in ab initio manner. This approach consists of the adiabatic expansion and the R-matrix propagation based on the Luttinger Hamiltonian incorporating the effect of valence-band mixing (VBM). This theory has been applied to a single quantum-well (QW) and superlattices (Wannier Stark ladder (WSL)) of GaAs/Al_xGa_<1-x>As semiconductors, and variance of FR spectra due to changes of well-thickness and strength of electric- and magnetic-fields is examined in de tail. Above all, the following new findings are obtained. In relatively wide QW's, overlap resonance of FR ascribable to VBM is substantial. In an asymmetric double QW's, a hy bridized exciton states generated by an electron and hole pair pertaining to different wells has a somehow pronounced oscillator strength, which is also discernible in the existing experiment. Furthermore, FR plays decisive roles in dimensionality transition of WSL from a quasi-two dimensional system to a bulk one with decreasing an applied electric field.

低维激子的Fano共振（FR）由于空间量子限制产生的子带的耦合而表现出来。由此产生的FR状态属于多通道散射（MCS）状态。但是，由于MCS问题很少，因此常规理论方法存在很多困难。在本研究中，人们成功地克服了所有这些问题，并建立了一种新型的MCS低维基激子理论，这使我们能够以初期的方式评估FR的自然光谱和共振宽度。这种方法由基于Luttinger Hamiltonian的绝热膨胀和R-Matrix繁殖组成，这些繁殖体结合了价频段混合的效果（VBM）。该理论已应用于GAAS/al_xga_ <1-x>的单个量子孔（QW）和超级晶格（Wannier Stark梯子（WSL））作为半导体，并且由于在DE尾部中检查了电动和磁场强度的变化，而FR光谱的方差则是FR光谱的变化。最重要的是，获得了以下新发现。在QW相对较宽的QW中，FR的重叠共振归因于VBM是很大的。在不对称的双QW中，与不同井有关的电子和孔对产生的hy培养基激子状态具有某种明显的振荡器强度，在现有实验中也可以识别。此外，FR在WSL的维度跃迁中发挥了决定性作用，从准二维系统到散装系统，并减少了施加的电场。

项目成果

J. Azuma, N. Toshima, K. Hino, A. Igarashi: "Basis-spline calculations of proton and anti-proton impact ionization of a hydrogen atom"Phys. Rev. A. 64. 062704_1-062704_9 (2001)

J. Azuma、N. Toshima、K. Hino、A. Igarashi：“氢原子的质子和反质子碰撞电离的基本样条计算”Phys。

K.Hino: "Conspicuous influence of hole-subband mixing on Fano-resonance profiles of excitons in a wide quantum well"Phys. Rev. B 62., R10626-R10629(2000) Erratum, Phys. Rev. B. 63. 119901-1-119901-1 (2001)

K.Hino：“空穴子带混合对宽量子阱中激子法诺共振剖面的显着影响”Phys。

K.Hino: "Multi-channel Scattering Calculations of Fano Interference of Quasi-Two-Dimensional Excitons"J.Phys.Soc.Jpn.. 69. 3441-3450 (2000)

K.Hino：“准二维激子 Fano 干涉的多通道散射计算”J.Phys.Soc.Jpn.. 69. 3441-3450 (2000)

K.Hino: "Fano Resonances of Quasi-Two-Dimensional Magnetoexcitons by the Three-Channel Landau-Zener Model"J.Phys.Soc.Jpn.. 69. 836-850 (2000)

K.Hino：“三通道朗道-齐纳模型的准二维磁激子的法诺共振”J.Phys.Soc.Jpn.. 69. 836-850 (2000)

K.Hino: "High-Resolution Calculations of Fano Resonance of Excitons in Semiconductor Quantum Wells and Superlattices"Bulletin of the Stefan University, Luminescent Materials. 14. 39-42 (2002)

K.Hino：“半导体量子阱和超晶格中激子法诺共振的高分辨率计算”斯蒂芬大学公报，发光材料。