Dynamical Terahertz Spectroscopy of Semiconductor Nanostructures

这个项目探索半导体纳米结构中的线性和非线性太赫兹(THz)动力学。其目的是研究半导体纳米结构中量子受限载流子的行为，这些半导体纳米结构受到强烈的太赫兹激光辐射的驱动。这项研究的重点是探索原子光谱学中无法达到的非微扰状态下的强光-物质相互作用。这项研究提供了对多体系统复杂动力学的新见解，但同样重要的是，它有助于开发在技术上很少探索的太赫兹频率范围(0.1-10太赫兹)工作的新型半导体器件。我们将特别关注如何通过用强太赫兹振荡场“修饰”量子限制态来控制这种动力学。由于强烈的、相干的和可调谐的太赫兹辐射源的稀有，这方面的研究还没有得到很好的探索。这些实验将使用斯坦福自由电子激光器进行，该激光器最近被扩展到这个频率范围。%这个项目研究半导体中载流子的非平衡动力学。主要的重点是利用太赫兹/远红外光谱技术探测强磁场中量子受限系统中的多体效应。这项研究提供了对相关受限载流子基本物理的洞察，但同样重要的是，它对于开发工作在太赫兹(THz)频率范围内的新型半导体器件很有用。这个频率范围介于电子(100 GHz)和光子(10太赫兹)频率之间，在科学上很丰富，但在技术上却很贫乏。

9970962KonoThis project explores linear and nonlinear terahertz (THz) dynamics in semiconductor nanostructures. The objective is to study the behavior of quantum-confined carriers in semiconductor nanostructures that are strongly driven by intense THz laser radiation. The focus of the research is to explore strong light-matter interactions in non-perturbative regimes that are inaccessible in atomic spectroscopy. Such research provides new insight into the complicated dynamics of many-body systems, but equally important, it is useful for developing novel semiconductor devices that operate in the technologically little explored THz frequency range (0.1 -10 THz). Particular attention will be placed on how we can control such dynamics by "dressing" the quantum-confined states with strong THz oscillating fields. Because of the rarity of sources for intense, coherent, and tunable THz radiation, research in this direction has not been well explored. The experiments will be performed using the Stanford Free-Electron Laser, which has been recently extended to this frequency regime.%%%This project deals with the non-equilibrium dynamics of carriers in semiconductors. The main emphasis is in probing many-body effects in quantum-confined systems in strong magnetic fields using terahertz/far-infrared spectroscopic techniques. Such research provides insight into the fundamental physics of correlated confined carriers, but equally important, it is useful for developing novel semiconductor devices that operate in the terahertz (THz) frequency range. This frequency range, lying between electronic ( 100 GHz) and photonic ( 10 THz) frequencies, is scientifically rich but technologically poor.***