An Experimental Investigation of Charge and Spin Density Waves

电荷和自旋密度波的实验研究

• 批准号: 9218745
• 负责人: George Gruner
• 金额: $ 36万
• 依托单位: University of California-Los Angeles
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1993
• 资助国家: 美国
• 起止时间: 1993-03-01 至 1996-02-29
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9218745&HistoricalAwards=false
• 关键词: Experimental; Investigation; Charge; Spin; Density

This research involves various experiments which lead to information concerning the dynamics of charge density wave (CDW) and spin density wave (SDW) ground states. The collective mode ac response of CDW and SDW condensates will be investigated in the radio, micro, millimeter and infrared spectral range, and will emcompass a search for nonlinear excitations of the ground states. These experiments will lead to information on the interplay between collective mode and single particle excitations, including questions concerning the dynamics of internal modes of the condensates. Experiments will also be conducted under the joint application of dc and ac fields, in an attempt at exploring the possibility of quantum phenomena which may arise at low temperatures in the various broken symmetry ground states. The experiments will be conducted on various inorganic and organic linear chain compounds. %%% This research involves the study of the behavior of various types of new, ordered electron states of solids, called the charge density wave and spin density wave states. The electrical conductivity will be investigated as the function of frequency and of applied electric fields. The objective is to examine the new type of nonlinear transport phenomena which are due to the collective motion of these electron states. Because of anomalous response, these materials may also serve as novel detectors and generators, and these aspects of the field will also be examined. The experiments will be conducted in various organic and inorganic materials where such states develop.

这项研究涉及各种实验， 关于电荷密度波（CDW）动力学的信息 和自旋密度波（SDW）基态。 集体模式AC CDW和SDW冷凝物的响应将在 无线电，微米，毫米和红外光谱范围，并将 对基态的非线性激发进行研究。 这些实验将导致信息的相互作用 集体模式和单粒子激发之间的关系，包括 的内部模式的动力学问题 冷凝物 实验也将在联合 直流和交流领域的应用，试图探索 量子现象的可能性，可能会出现在低 各种对称性破缺基态的温度。 的 实验将在各种无机和有机 直链化合物 %%% 这项研究涉及对各种类型的行为的研究 新的，有序的固体电子状态，称为电荷 密度波和自旋密度波态。 电 电导率将作为频率的函数进行研究， 应用的电场。 目的是研究新的 一种非线性传输现象，这是由于 这些电子态的集体运动。 由于异常 响应，这些材料也可以作为新的探测器， 发电机，以及该领域的这些方面也将进行审查。 实验将在各种有机和无机 这些国家发展的地方。