Resonant optical and transport phenomena in strongly driven nanostructures

系统对外部电磁扰动的共振响应是凝聚态物理学的核心，也是其在电子学和光电子学中的大多数应用。外场可以强烈地改变光谱特性（霍尔效应、超晶格），导致载流子的非平衡分布（激光物理学），并导致产生定性新输运行为的不稳定性（古恩效应、超晶格中的电不稳定性、光的产生、零电阻状态）。该项目的目的是发展新兴纳米结构的传输和光学特性的理论，其中上述效应起着至关重要的作用。特别是，该项目解决了（A）量子化磁场中的超高迁移率二维电子气，由强直流和微波场驱动（最近关于量子霍尔系统的光电导性的实验发现了新类型的磁振荡和零电阻状态，这引起了极大的兴趣），（B）由隧道耦合量子点的规则阵列组成的量子级联结构（潜在地，在太赫兹和远红外频率范围内非常有效的相干辐射源）。

Resonant response of a system to external electro-magnetic perturbations is in the heart of the condensed matter physics and most of its applications in electronics and optoelectronics. External fields can strongly modify spectral properties (Hall effect, superlattices), lead to nonequilibrium distribution of carriers (laser physics), and cause instabilities yielding qualitatively new transport behavior (Gunn effect, electrical instabilities in superlattices, light generation, zero resistance states). The aim of the project is to develop theory for the transport and optical properties of emergent nanostructures where the above effects play a crucial role. In particular, the project addresses (A) ultra-high-mobility two-dimensional electron gas in quantizing magnetic field, driven by strong dc and microwave fields (recent experiments on photoconductivity of quantum Hall systems discovered novel types of magnetooscillations and zero resistance states, which attracted a great deal of interest), (B) quantum cascade structures consisting of a regular array of tunnel-coupled quantum dots (potentially, very efficient source of coherent radiation in THz and far-infrared range of frequencies).