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

9817828斯坦顿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。 可调谐飞秒激光器现在使研究固体的详细动力学信息成为可能。 飞秒激光探测这些系统在相同的时间尺度上的散射过程。飞秒激光技术的改进，在过去的十年中，导致了新的能力的快速发展。 短于5飞秒的脉冲现在是可能的。 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有所改进。 这为研究载流子动力学、相干电子/声子态、脉冲整形和量子控制以及光电子/光子学应用开辟了新的途径。本研究将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。 具体来说，我们将研究四波混频和差分反射光谱在新材料，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;将相干声子理论的工作扩展到超晶格和超导体，并包括耗散效应;并且，在本发明中，研究波包动力学/超晶格中的量子控制，并进一步研究相关波包如何失去其相干性。9817828这是对相干和非相干超快动力学理论研究的资助。固体中的非相干电子和声子。 可调谐飞秒激光器现在使研究固体的详细动力学信息成为可能。 飞秒激光探测这些系统在相同的时间尺度上的散射过程。飞秒激光技术的改进，在过去的十年中，导致了新的能力的快速发展。 短于5飞秒的脉冲现在是可能的。 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有所改进。 这为研究提供了新的机会，包括探测载流子动力学;创造相干电子/声子态;脉冲整形和量子控制;以及光电/光子应用。研究固体中的这些效应应该为固体中的相干和非相干过程提供新的基本理解，并为光电器件的应用打开大门，可能还有量子计算。*

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.***