Investigations of Acoustic Phonons in Metal Films, and theirRole in Non-equilibrium Experiments

这项研究涉及到薄膜中声学声子的性质。这一知识对于明确解释这些系统的非平衡测量是必不可少的。其目的是为了更全面地了解声子的维度、占位数以及不同固体之间的传输。所采用的实验技术将磁阻和电子加热实验与声子光谱相结合，用于研究可以原位改变声子性质的新结构。这项研究还将扩展到无序金属薄膜中的声衰减的研究。用于精确测量电阻率的触点和连接的薄膜将被制造在新型声腔内，从而允许同时测量声音衰减和电学特性。

The research is concerned with the properties of acoustic phonons in thin films. This knowledge is essential for the unambiguous interpretation of non-equilibrium measurements of these systems. The objective is to obtain a more complete knowledge of phonon dimensionality, occupation number, and transmission between dissimilar solids. The experimental techniques to be employed combine magnetoresistance and electron heating experiments with phonon spectroscopy in the study of novel structures in which the phonon properties can be modified in situ. The research will also be broadened to the investigation of acoutic attenuation in disordered metal films. Films with contacts and connections for precision resistivity measurements will be fabricated inside novel acoutic cavities permitting the simultaneous measurement of sound attenuation and electrical properties.