U.S.- Hungary Research on Ultrafast Phase Changes in Semiconductors

威斯康星大学史蒂文斯角分校的格雷戈里·塔夫脱和托马斯·乔治及其匈牙利合作伙伴塞格德大学的拉兹洛·纳奈和桑德尔·萨特马里的国际合作研究项目的目标是了解半导体在飞秒时间尺度上发生的物理过程。匈牙利在实验激光物理方面的专业知识补充了史蒂文斯点小组的优势，该小组的优势包括飞秒脉冲产生和测量以及激光物质相互作用理论。这些美国和匈牙利的物理学家将一起研究邓伯电场效应及其在载流子演化的早期阶段的作用。他们希望确定这种影响是否会变得足够大，从而引发半导体的结构变化。结果有望完善理论框架，提高我们对半导体中快速电子信号传播的基本理解，在高速光通信中具有潜在的广泛应用。该实验物理化学项目通过使美国和中欧的专家在共同感兴趣和能力强的领域结合互补的人才和共享研究资源，实现了推进科学知识的计划目标。

The goal of this international cooperative research project between Gregory Taft and Thomas George of the University of Wisconsin-Stevens Point and their Hungarian partners, Laszlo Nanai and Sandor Szatmari of the University of Szeged, is to understand the physical processes occurring in semiconductors at femtosecond time scales. The Hungarian expertise in experimental laser physics complements that of the Stevens Point group whose strengths include femtosecond pulse generation and measurement and theory of laser-matter interaction. Together, these U.S. and Hungarian physicists will examine the Dember electric field effect and its role in earliest stages of the charge carrier evolution. They expect to determine if that effect could become large enough to initiate structural changes in semiconductors. Results are expected refine the theoretical framework and improve our basic understanding of the propagation of fast electronic signals in semiconductors, with potentially broad general applications in high-speed optical communications. This project in experimental physical chemistry fulfills the program objective of advancing scientific knowledge by enabling experts in the United States and Central Europe to combine complementary talents and share research resources in areas of strong mutual interest and competence.