Center-of-mass quantization of excitons in GaAs quantum-well wires.
Center-of-mass quantization of excitons in GaAs quantum-well wires.
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GaAs 量子阱线中激子的质心量子化。
DOI：
10.1103/physrevb.44.6550
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发表时间：
1991
期刊：
影响因子：
--
通讯作者：
Ploog
中科院分区：
文献类型：
--
作者：
Lage;Heitmann;Cingolani;Grambow;Ploog
我们用偏振相关光致发光和光致发光激发光谱研究了宽量子势线结构。我们观察到最低的重孔激发共振的三重分裂，这是由于激子质心垂直于导线方向的运动的量子化引起的。这些跃迁之间的能量间隔取决于有效线宽${\mathit{L}}_{\mathit{x}}$，它明显小于几何线宽。用n\ensuremath{\pi}/${\mathit{L}}_{\mathit{x}}$，识别激子波矢{{\mathit{K}}_{\mathit{ex}}^{\mathit{n}，我们可以重建激子色散，如果使用k=0重空穴质量，则与理论符合得很好。
We have studied wide quantum-well-wire structures by polarization-dependent photoluminescence and photoluminescence excitation spectroscopy. We observe an up-to-threefold splitting of the lowest heavy-hole-excition resonance, which arises from a quantization of the excitonic center-of-mass motion perpendicular to the direction of the wires. The energy separation between these transitions depends on the active wire width ${\mathit{L}}_{\mathit{x}}$, which is significantly smaller than the geometrical wire width. Identifying the exciton wave vector ${\mathit{K}}_{\mathrm{ex}}^{\mathit{n}}$ with n\ensuremath{\pi}/${\mathit{L}}_{\mathit{x}}$, we can reconstruct the exciton dispersion and find excellent agreement with theory if we use the k=0 heavy-hole mass.