Experimental Studies of Quantum Dynamics of Electrons in Disordered Metals

无序金属中电子量子动力学的实验研究

• 批准号: 9423088
• 负责人: John Carini
• 金额: $ 22.5万
• 依托单位: Indiana University
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1995
• 资助国家: 美国
• 起止时间: 1995-02-15 至 1998-04-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9423088&HistoricalAwards=false
• 关键词: Experimental; Studies; Quantum; Dynamics; Electrons

9423088 Carini This project investigates the microwave conductivity (up to a frequency of 20 megahertz) of disordered metals in which the electrons are close to a localization transition, such as ultrathin metal films and highly disordered metal alloys. Experiments will compare the dc and microwave conductivity as a function of temperature (T30mK) and magnetic field (B8T). Theses measurements will test the predictions of the scaling theory, which treats the transition as a quantum-critical point where the temperature, alloy concentration, and frequency dependence of the conductivity are related to the same critical length-scale. % % % The proposed experiments study the transition from the metallic state to the insulating state that occurs in disordered materials when the electrons become localized in space. The localization transition occurs because of the wavelike behavior of the electrons as quantum mechanical particles, and yet the transition is a collective phenomenon where all parts of the system undergo the same change of state at the same time. The experiments will measure the electrical conductivity in disordered metals in order to understand how quantum mechanics affects the transition between the conducting and insulating states. ***

9423088 CARINI该项目研究了无序金属的微波电导率（高达20兆赫的频率），其中电子接近定位过渡，例如超薄金属膜和高度无序的金属合金。 实验将比较DC和微波电导率与温度（T30MK）和磁场（B8T）的函数。 这些测量结果将测试缩放理论的预测，该预测将过渡视为量子临界点，在该点温度，合金浓度和电导率的频率依赖性与相同的临界长度尺度有关。 ％％％的拟议实验研究了从金属状态到绝缘状态的过渡，该状态在电子局部在空间中时发生在无序材料中。 由于电子作为量子机械颗粒的波浪行为而发生的定位转变，但是转变是一种集体现象，其中系统的所有部分同时经历了同一状态变化。 实验将测量无序金属中的电导率，以了解量子力学如何影响导电和绝缘状态之间的过渡。 ***