Momentum-dependent electron dynamics in a 2D aperiodic potential

二维非周期势中动量相关的电子动力学

• 批准号: 528316563
• 负责人: Professor Dr. Wolf Widdra
• 金额: --
• 依托单位: National Science and Technology Council (NSTC)
• 依托单位国家: 德国
• 项目类别: Research Grants
• 资助国家: 德国
• 项目状态: 未结题
• 来源: https://gepris.dfg.de/gepris/projekt/528316563?language=en
• 关键词: Momentum; dependent; electron; dynamics; 2D

The field of electronic structure and electron dynamics of long-range ordered aperiodic systems is still in its infancy. In strong contrast to the well-studied electron dynamics in 2D and 3D periodic crystals, the absence of translational symmetry within the aperiodic potentials of quasicrystals is incompatible to the traditional picture of band structure and the delocalized Bloch states. In this context, our Taiwan-German project focusses on electrons in image potential states at the surface of dodecagonal oxide quasicrystals. It combines the advancement of 2D quasicrystal growth and the time- and momentum-resolved two-photon photoelectron spectroscopy. For dodecagonal oxide quasicrystals derived from BaTiO3 and SrTiO3 thin films grown on metallic substrates, image potential states are ideally accessible. For this textbook electron system, the impact of the aperiodic 2D structure on the energy-momentum dispersion of electrons and their femtosecond dynamics will be studied. Results for aperiodic potentials of different fundamental length and strength allow for a systematic comparison of induced modifications.

远程有序的大道系统的电子结构和电子动力学领域仍处于起步阶段。与2D和3D周期晶体中研究充分的电子动力学形成鲜明对比的是，准晶体的上型势势不存在翻译对称性，这与传统的频带结构和分离式化的蓝术状态不相容。在这种情况下，我们的台湾 - 德国项目将重点放在十二氧化物氧化物准晶体表面的图像势状态中的电子。它结合了2D准晶体生长的进步以及时间和动量分辨的两光子光电光谱。对于源自金属底物生长的batio3和srtio3薄膜的十二氧化氧化物准晶体，图像潜在状态可访问。对于此教科书电子系统，将研究Aperiodic 2D结构对电子及其飞秒动力学的能量弹药分散体的影响。具有不同基本长度和强度的多个势能的结果，可以对诱导的修饰进行系统的比较。