The Ultrafast Dynamics of Coherent and Incoherent Electrons and Phonons in Condensed Matter Systems

这是对固体中相干和非相干电子和声子的超快动力学理论研究的资助。现在，可调谐的飞秒激光使更详细地研究固体的动力学信息成为可能。飞秒激光探测这些系统的时间尺度与散射过程相同。在过去十年中，飞秒激光技术的进步导致了新能力的快速发展。现在，短于五飞秒的脉冲是可能的。此外，在可调谐性、峰值功率和执行可编程脉冲整形的能力方面也发生了改进。这为研究载流子动力学、创造相干电子/声子态、脉冲整形和量子控制以及光电子/光子应用开辟了新的机会。这项研究将进一步扩展上述领域的理论工作，进一步研究凝聚态系统中相干和非相干电子和声子的新的基本性质。具体地说，我们将研究新材料中的四波混频和差分反射光谱，如GaN(相干和非相干效应)；稀磁半导体中的相干和非相干自旋弛豫；将相干声子理论扩展到超晶格和超导体，并包括耗散效应；以及研究超晶格中的波包动力学/量子控制，并进一步研究关联波包如何失去相干性。9817828这是对固体中相干和非相干电子和声子的超快动力学理论研究的资助。现在，可调谐的飞秒激光使更详细地研究固体的动力学信息成为可能。飞秒激光探测这些系统的时间尺度与散射过程相同。在过去十年中，飞秒激光技术的进步导致了新能力的快速发展。现在，短于五飞秒的脉冲是可能的。此外，在可调谐性、峰值功率和执行可编程脉冲整形的能力方面也发生了改进。这为研究开辟了新的机会，包括探测载流子动力学；创建相干电子/声子态；脉冲整形和量子控制；以及光电子/光子应用。研究这些效应是固体应该提供对固体中相干和非相干过程的新的基本理解，并为应用于光电子器件和可能的量子计算打开大门。

9817828StantonThis is a grant for theoretical research on the ultrafast dynamics of coherent and incoherent electrons and phonons in solids. Tunable femtosecond lasers now make it possible to study dynamical information about solids in great detail. Femtosecond lasers probe these systems on the same time-scale as that of scattering processes.Improvements in femtosecond laser technology within the last decade have led to the rapid development of new capabilities. Pulses shorter than five femtoseconds are now possible. In addition, improvements have occurred in tunability, peak power, and the ability to perform programmable pulse shaping. This has opened up new opportunities for study including probing carrier dynamics; creating coherent electron/phonon states; pulse shaping and quantum control; and, optoelectronic/photonic applications.This research will extend previous theoretical work in the above areas to further study new and fundamental properties of coherent and incoherent electrons and phonons in condensed matter systems. Specifically, we will investigate four-wave mixing and differential reflectivity spectroscopy in new materials such as GaN (both coherent and incoherent effects); coherent and incoherent spin relaxation in dilute magnetic semiconductors; extend our work on the theory of coherent phonons to superlattices and superconductors and include the effects of dissipation; and, study wave packet dynamics/quantum control in superlattices and further investigate how a correlated wave packet loses its coherence.9817828This is a grant for theoretical research on the ultrafast dynamics of coherent and incoherent electrons and phonons in solids. Tunable femtosecond lasers now make it possible to study dynamical information about solids in great detail. Femtosecond lasers probe these systems on the same time-scale as that of scattering processes.Improvements in femtosecond laser technology within the last decade have led to the rapid development of new capabilities. Pulses shorter than five femtoseconds are now possible. In addition, improvements have occurred in tunability, peak power, and the ability to perform programmable pulse shaping. This has opened up new opportunities for study including probing carrier dynamics; creating coherent electron/phonon states; pulse shaping and quantum control; and, optoelectronic/photonic applications.Studying these effects is solids should provide new basic understanding of coherent and incoherent processes in solids and open the door for applications in optoelectronic devices and, possibly, quantum computing.***