标题: | 半导体奈米元件的轨道与电子自旋磁性 Orbital and Spin Magnetism in Semiconductor Nano-Objects |
作者: | 霍斯科 Voskoboynikov Oleksa 国立交通大学电子工程学系及电子研究所 |
关键字: | 轨道磁性;半导体;量子点;orbital magnetism;semiconductor;quantum dots |
公开日期: | 2010 |
摘要: | 现代的半导体技术已经发展到可以制作人造半导体介观物质,利用數十奈米尺度 的微小物体來建构这些新的介物质。而这些奈米半导体介物质让我们很有潜能在 一个非常广的范围内操纵电磁场,这可以应用在很多新的应用元件或基础科学, 短期可能的伟大成就包含:大规模量子计算、光学的负折射率介物质、使用非磁 性物质來产生静磁性或动态磁性,等等惊人的发展。 明显的,奈米半导体介物质需要一个合适的半导体奈米材料组成,近年來,量子 点、量子环、量子线、量子点分子的物理特性大幅被瞭解,包括他们的传输、磁 场还有光学行为,他们会是很合适的候选人。但是,我们对这些奈米材料相对应 的动态静态的轨道与自旋的磁学却所知不多。 在我们先前的工作,我们已经在理論上成功验证了,在非磁性半导体上获得特殊 动态静态磁性的机会。我们也成功验证了量子环复合材料足以产生等效负介电常 數与透磁率。 在这个接续的计画中,我们设计发展一个有力的理論基础去描述半导体奈米材料 与介物质的磁场控制行为。包含兩方面: 1. 拥有少數可控制的电子(电洞)能阶的半导体奈米材料的轨道与自旋磁学的量 化描述 2. 在一个包含兩个以上的奈米材料的系统中,这些奈米材料间的量子与电磁交 互作用 我们将发展一套方法去设计并控制非磁性半导体奈米材料(包含量子点,量子 环,量子点分子)的轨道与自旋磁性,这将提供我们对半导体介物质特殊磁性的 最重要的资讯。我们强调,这个方法将有与传统半导体科技相容的优势。 Modern progress in semiconductor technology made it possible to fabricate artificial semiconductor meta-materials. Those new materials can be constructed from very small objects, typically a few tens of nanometers in size. Nano-structured semiconductor meta-materials potentially can manipulate electromagnetic fields in very wide diapason, which is particularly beneficial for many applications and devices, as well as for new basic science. The short list of possible urgent implementations in this field consists of realization of large scale quantum computation, meta-materials with the negative refracting index in optical range, static and dynamic artificial magnetism in basically non-magnetic materials, etc. Obviously, nano-structured semiconductor meta-materials should be developed and assembled on the base of appropriate semiconductor nano-objects. In recent years the knowledge of the physical properties of semiconductor nano-sized objects, like quantum dots, nano-rings, nano-wires, and quantum dot molecules, with respect to their transport, magnetic and optical behavior has increased considerably. Most of investigations in this domain focus upon the photo-luminescent, optical and transport properties. In the same time the corresponding knowledge about the dynamic and static orbital and spin magnetism of the semiconductor nano-objects is particularly weak. In our previous works we have demonstrated theoretically a wide range of opportunities to obtain unusual dynamic and static magnetic properties of nano-objects made from non-magnetic semiconductors. We also have demonstrated an opportunity to obtain simultaneously effective negative permittivity and permeability in optical range using composite materials made from nano-rings. In this project we plan to develop a robust theoretical basement to the existing knowledge about magnetically-controlled behavior of semiconductor nano-objects and meta-materials made from them. Two aspects have to obtain sufficient attention: - the proper quantitative description of the orbital and spin magnetism of semiconductor nano-objects with controllable few electron's (hole's) states, - the mutual quantum and electromagnetic interactions between semiconductor nano-objects for systems containing two (or more) nano-objects. We will develop methods for the design and controllability of orbital and spin magnetism in nano-objects (quantum dots, nano-rings, quantum dot molecules) made from non-magnetic semiconductor materials. This will provide us with the most important information relevant for the novel semiconductor meta-materials with unusual magnetic properties. We stress, that the semiconductor approach has the advantage of being compatible with conventional semiconductor technology. |
官方说明文件#: | NSC97-2112-M009-012-MY3 |
URI: | http://hdl.handle.net/11536/100393 https://www.grb.gov.tw/search/planDetail?id=1982244&docId=323249 |
显示于类别: | Research Plans |
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