Coupling effects in artificial nano-dot lattices

人造纳米点晶格中的耦合效应

• 批准号: 286900577
• 负责人: Professor Dr. Michael Huth
• 金额: --
• 依托单位: Physikalisches Institut
• 依托单位国家: 德国
• 项目类别: Research Grants
• 财政年份: 2016
• 资助国家: 德国
• 起止时间: 2015-12-31 至 2019-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/286900577?language=en
• 关键词: Coupling; effects; artificial; nano; dot

New collective electronic states arise in ordered arrays of simple metallic or spin-doped metallic nanometer-sized elements, if they are coupled by tunneling of spin-carrying charges. It is the strength of this coupling in conjunction with possible influences of quantum-size effects and disorder in the arrays which governs the character of these collective states as emerging properties of the whole ensemble. The nature of the crossover between insulating and conducting ground states in metallic nano-dot arrays represents an important research questions in this regard. Ideally, this question should be studied on model systems for which the size of the nano-dots and their mutual coupling strength can be well controlled. In this project we use such a model system based on platinum nano-dot arrays with precisely tunable tunnel coupling between the nano-dots to study the dimensionality-dependent insulator-to-metal crossover or phase transition of the arrays. Furthermore, we lay the foundation for the extension of this approach in the near future to copper nano-dot arrays with variable degree of iron impurity doping. In such arrays the consequences of inter-dot coupling and finite size effects on the development of a Kondo screening cloud can be studied. We reach these objectives by applying and advancing recently developed methods of focused electron beam induced deposition combined with selective area atomic layer deposition. Our methodological approach will be of more general importance for nanostructure preparation in the wider fields of mesoscopic physics and the physics of strongly correlated metals.

新的集体电子状态以简单金属或旋转金属纳米尺寸元素的顺序阵列出现，如果它们是通过旋转携带电荷的隧道耦合的。这是这种耦合的强度与阵列中量子大小效应和混乱的可能影响，它控制着这些集体状态的特征，作为整个集合的新兴特性。在金属纳米点阵列中的绝缘和传导基态之间的交叉性质代表了这方面的重要研究问题。理想情况下，应该在模型系统上研究这个问题，纳米点的大小及其相互耦合强度可以很好地控制。在这个项目中，我们使用基于铂纳米点阵列的这种模型系统，在纳米点之间具有精确调谐的隧道耦合来研究依赖于维度的绝缘体到金属交叉或阵列的相变。此外，我们为在不久的将来扩展到具有变化的铁杂质掺杂的铜纳米点阵列的基础。在这样的阵列中，可以研究点间耦合和有限尺寸对近野筛选云的发展的后果。我们通过应用和前进最近开发的聚焦电子束诱导沉积与选择性区域原子层沉积的方法达到这些目标。我们的方法论方法对于在更广泛的介质物理学和强相关金属的物理学领域中的纳米结构制备对纳米结构制备更为重要。