Quantum Transport in Non-Equilibrium Two-Dimensional Electron Systems

非平衡二维电子系统中的量子输运

• 批准号: 0706634
• 负责人: Rui-Rui Du
• 金额: --
• 依托单位: William Marsh Rice University
• 依托单位国家: 美国
• 项目类别: Continuing grant
• 财政年份: 2007
• 资助国家: 美国
• 起止时间: 2007-06-01 至 2010-05-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0706634&HistoricalAwards=false
• 关键词: Quantum; Transport; Non; Equilibrium; Two

****NON-TECHNICAL ABSTRACT****This award supports experimental investigation of electronic behavior in a far-from-equilibrium system in a semiconductor quantum device, where surprising new effects have been recently discovered. For example, as discovered under prior NSF support, electrical transport in a semiconductor device can exhibit vanishing resistance when it is exposed to microwaves. This research project will investigate the effects of microwaves combined with small magnetic fields on the electronic transport in these devices. Additional experiments will image the electron flow pattern in the microwave-induced zero-resistance states using a unique microscope sensitive to magnetic fields. Understanding of fundamental properties of a semiconductor device driven by microwaves is directly relevant to emerging issues in future technologies such as "spintronics" (using the magnetic as well as electrical properties of electrons in devices) and "quantum information processing" (using quantum mechanical behavior to store and process information). The research will be carried out by graduate students and will also include the participation of undergraduate students. The graduate students will learn semiconductor physics, microwave technology, and imaging techniques, which will serve them well for employment in the national research infrastructure and high-technology industry.****TECHNICAL ABSTRACT****The high-mobility two-dimensional electron system (2DES) provided by the state-of-the-art GaAs/AlGaAs technology is a clean laboratory for many-electron physics. This individual investigator award supports experimental investigations of a new regime of 2D physics; the quantum transport in 2DES that is subjected to far-from-equilibrium conditions. The subject matter includes the newly discovered phenomenon of radiation-induced resistance oscillations and the zero-resistance/zero-conductance states in a 2DES exposed to millimeter wavelength electromagnetic waves, dc current-induced magnetoresistance oscillations and nonlinear transport, and nonlinear optical effects in the millimeter wave regime and their influence to dc electronic transport. The project will expand beyond the standard dc transport, to include imaging experiments on the current flow pattern in microwave-induced zero-resistance states using a low temperature scanning Hall probe microscope. It will explore the electron flow pattern formation in the semi-classical and quantum regimes in a microwave-driven electronic system. The studies will be carried out by graduate students and will also include the participation of undergraduate students. The graduate students will learn semiconductor physics, microwave technology, and imaging techniques, which will serve them well for employment in the national research infrastructure and high-technology industry.

****非技术摘要****该奖项支持半导体量子设备中远程平衡系统中电子行为的实验研究，最近发现了令人惊讶的新效果。例如，正如在先前的NSF支持下发现的那样，半导体设备中的电运运输在暴露于微波炉时会表现出消失的电阻。 该研究项目将研究微波与小磁场对这些设备中电子传输的影响。 其他实验将使用对磁场敏感的独特显微镜在微波诱导的零耐态中成像电子流量图。了解由微波驱动的半导体设备的基本特性与未来技术中的新兴问题直接相关，例如“ Spintronics”（使用设备中电子的磁性以及电子性能）和“量子信息处理”（使用量子机械行为来存储和流程信息）。这项研究将由研究生进行，还将包括本科生的参与。研究生将学习半导体物理学，微波技术和成像技术，这将在国家研究基础架构和高技术行业中为他们提供很好的就业。该个人研究者奖支持对2D物理学新制度的实验研究； 2DE中的量子运输经历了远程平衡条件。该主题包括新发现的辐射诱导的电阻振荡现象以及在暴露于毫米波长的电磁波的2DE中，DC电流诱导的磁磁性振荡振荡和非线性运输，以及非线性运输，以及非线性的光学效应，在毫米中及其在毫会影响下，零耐药性/零导电状态。该项目将超越标准直流运输，包括使用低温扫描HALL探针显微镜在微波炉诱导的零阻力状态下进行当前流动模式的成像实验。它将在微波驱动的电子系统中探索在半古典和量子方案中的电子流量图。研究将由研究生进行，还将包括本科生的参与。研究生将学习半导体物理，微波技术和成像技术，这将为他们提供在国家研究基础设施和高科技行业中的就业。