概括
摩埃尔超级格子中的结构障碍影响平带. 我们发现,虽然平均平带位置是稳定的,但混乱扩大了状态的密度,带隙和分散平带的行为不同.
科学领域:
- 凝聚物质物理学 凝聚物质物理学
- 材料科学 材料科学 材料科学
- 纳米技术纳米技术
背景情况:
- 莫伊尔超级格子表现出由平面带驱动的异国情调现象.
- 结构性障碍可以显著改变平带,减少它们的重要性.
- 了解障碍对平带的影响对于控制莫雷超级网格属性至关重要.
研究的目的:
- 为了研究结构障碍对基于的不匹配的摩埃尔超级格子中的平带的影响.
- 分析不同级别的混乱如何影响平带的光谱位置和状态密度 (DOS).
- 区分各种平带类型对结构缺陷的反应.
主要方法:
- 制造基于的不匹配的莫雷超级网格,具有受控的障碍水平.
- 数字模拟用于模拟条随机位置扰动的影响.
- 集成光谱属性的平均值,以分析障碍效应.
- 分析状态密度 (DOS) 配置文件和带隙特征.
主要成果:
- 四个平带的平均光谱位置尽管有越来越多的混乱,但仍然稳定.
- 混乱将利的,类似三角洲的DOS转化为有限宽度的信封.
- 随着混乱水平的增加,DOS信封的宽度会增加.
- 带隙平带显示和宽度增加,而分散带交叉平带显示线性宽度增加与混乱.
结论:
- 莫雷超级网中的平面带对结构性障碍表现出明显的反应.
- 带隙和分散带交叉平带具有从根本上不同的扰动特性.
- 对乱效应的洞察力为设计和利用部分乱的莫雷超级格子提供了新的视角.
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