Quantum confinement of carriers in the type-I quantum wells structure

IF 1.5 4区 物理与天体物理 Q2 PHYSICS, MULTIDISCIPLINARY
Xinxin Li, Zhen Deng, Yang Jiang, Chunhua Du, Haiqiang Jia, Wenxin Wang, Hong Chen
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引用次数: 0

Abstract

Quantum confinement is recognized to be an inherent property in low-dimensional structures. Traditionally, it is believed that the carriers trapped within the well cannot escape due to the discrete energy levels. However, our previous research has revealed efficient carrier escape in low-dimensional structures, contradicting this conventional understanding. In this study, we review the energy band structure of quantum wells along the growth direction considering it as a superposition of the bulk material dispersion and quantization energy dispersion resulting from the quantum confinement across the whole Brillouin zone. By accounting for all wave vectors, we obtain a certain distribution of carrier energy at each quantized energy level, giving rise to the energy subbands. These results enable carriers to escape from the well under the influence of an electric field. Additionally, we have compiled a comprehensive summary of various energy band scenarios in quantum well structures relevant to carrier transport. Such a new interpretation holds significant value in deepening our comprehension of low-dimensional energy bands, discovering new physical phenomena, and designing novel devices with superior performance.
I 型量子阱结构中载流子的量子约束
量子束缚被认为是低维结构的固有特性。传统观点认为,由于能级离散,被困在井中的载流子无法逃逸。然而,我们之前的研究发现,低维结构中的载流子逸出效率很高,这与传统认识相悖。在本研究中,我们回顾了量子阱沿生长方向的能带结构,将其视为整个布里渊区量子约束产生的块体材料色散和量子化能量色散的叠加。通过考虑所有波矢,我们得到了每个量子化能级上载流子能量的一定分布,从而产生了能量子带。这些结果使得载流子能够在电场的影响下逃离井。此外,我们还全面总结了量子井结构中与载流子传输相关的各种能带情况。这种新的解释对于加深我们对低维能带的理解、发现新的物理现象以及设计具有卓越性能的新型器件具有重要价值。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
Chinese Physics B
Chinese Physics B 物理-物理:综合
CiteScore
2.80
自引率
23.50%
发文量
15667
审稿时长
2.4 months
期刊介绍: Chinese Physics B is an international journal covering the latest developments and achievements in all branches of physics worldwide (with the exception of nuclear physics and physics of elementary particles and fields, which is covered by Chinese Physics C). It publishes original research papers and rapid communications reflecting creative and innovative achievements across the field of physics, as well as review articles covering important accomplishments in the frontiers of physics. Subject coverage includes: Condensed matter physics and the physics of materials Atomic, molecular and optical physics Statistical, nonlinear and soft matter physics Plasma physics Interdisciplinary physics.
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