Ferroelectric control of the electronic properties of ultra-thin metallic films

超薄金属薄膜电子特性的铁电控制

• 批准号: 210137963
• 负责人: Professor Dr. Friedrich Reinert
• 金额: --
• 依托单位: Lehrstuhl für Experimentelle Physik VII
• 依托单位国家: 德国
• 项目类别: Research Grants
• 财政年份: 2012
• 资助国家: 德国
• 起止时间: 2011-12-31 至 2016-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/210137963?language=en
• 关键词: Ferroelectric; control; electronic; properties; ultra

The goal of this project is to control in situ the physical properties of thin films using the local electric field of a ferroelectric substrate with the aim to observe directly the response of the system by photoemission spectroscopy techniques. Our purpose is based on two strategies. We will focus on model systems like Pt/BaTiO3, Fe/BaTiO3 and Bi/BaTiO3 heterosystems that are representatives of strong interface coupling. Particularly the Bi/BaTiO3 interface is interesting to achieve a ferroelectric control of Rashba splitting strength of the Bi surface states. Owing to BaTiO3 lattice parameter change with the structural phase transitions, we will modify the properties of the film systems deposited on the substrate. In fact, the properties of these systems are highly connected to atomic distances and orientation that we could modify with the substrate properties. These two approaches offer the opportunity to control and measure in situ the electronic properties by photoemission spectroscopy either by using a spontaneous electric polarization, similar to applying a local electric field, or by applying a tunable strain, similar to using a diamond anvil cell on our systems.

该项目的目标是利用铁电衬底的局部电场原位控制薄膜的物理性质，目的是通过光电子能谱技术直接观察系统的响应。我们的目标基于两个战略。我们将专注于模型系统，如Pt/BaTiO 3，Fe/BaTiO 3和Bi/BaTiO 3异质系统，它们是强界面耦合的代表。特别是Bi/BaTiO 3界面是有趣的，以实现Bi表面态的Rashba分裂强度的铁电控制。由于BaTiO_3晶格参数随结构相变而变化，我们将改变沉积在衬底上的薄膜系统的性质。事实上，这些系统的性质与原子距离和取向密切相关，我们可以根据衬底性质进行修改。这两种方法提供了通过光电子能谱原位控制和测量电子性质的机会，通过使用自发电极化，类似于施加局部电场，或者通过施加可调应变，类似于在我们的系统上使用金刚石砧单元。

项目成果

Valence characterisation of the subsurface region in

• DOI: 10.1080/14786435.2016.1192724
• 发表时间: 2016-05
• 期刊: Philosophical Magazine
• 影响因子: 1.6
• 作者: P. Lutz;M. Thees;T. Peixoto;B. Kang;B. Cho;C. Min;F. Reinert