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，这些实验导致有关电荷密度波（CDW）和旋转密度波（SDW）基态动力学的信息。 CDW和SDW冷凝物的集体模式AC响应将在无线电，微型，毫米和红外光谱范围内进行研究，并将emcompass搜索基态的非线性激发。 这些实验将导致有关集体模式和单个粒子激发之间相互作用的信息，包括有关冷凝水内模式动力学的问题。 还将在DC和AC场的联合应用下进行实验，以探索在各种破碎的对称地面状态下低温下可能出现的量子现象的可能性。 实验将在各种无机和有机线性链化合物上进行。 %% %%这项研究涉及研究各种新型的固体中有序电子状态的行为，称为电荷密度波和旋转密度波状态。 电导率将作为频率和施加的电场的功能进行研究。 目的是检查由于这些电子状态的集体运动而引起的新型非线性转运现象。 由于反应异常，这些材料也可以用作新的探测器和发生器，并且还将检查该领域的这些方面。 实验将在这种状态发展的各种有机和无机材料中进行。