无势垒的量子限制
On quantum confinement without barriers
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中文总结 AI 辅助
本文论证了在无势垒情况下，材料能量色散（有效质量）也能实现量子限制，并预测了不同子带波函数空间局域化的可能性，可应用于量子级联激光器。
中文摘要 AI 辅助
通常，在半导体异质结构中，如量子阱，量子限制是通过异质势垒实现的，这些势垒仅仅是相邻材料中的能带偏移。本文提出论据，表明材料中的能量色散（在简单情况下由有效质量决定）同样重要。利用一个简单的模型系统，如带有附加异质结的量子阱，展示了载流子密度主要局域在有效质量较大的区域。预测了不同子带的波函数可能具有不同的空间局域化。这可以应用于诸如量子级联激光器等半导体结构。
英文摘要
Usually in semiconductor heterostructures, such as quantum wells, the quantum confinement is realized by means of heterobarriers, which are simply the band offsets in adjacent materials. Here the arguments are provided, that the energy dispersions in materials (in simple case determined by effective masses) are important as well. Using a simple model system, such as quantum well with an additional heterojunction, it is shown the predominant localization of the carrier density in the regions with higher effective mass. The possibility of different spatial localization of wave function for different subbands is predicted. This can be applied in semiconductor structures such as quantum cascade lasers.
发表机构
- Ioffe Institute（伊俄费研究所）
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