Macroscopic and microscopic investigation of the microwave induced zero resistance state

在高迁移率的二维电子系统中，受到强垂直磁场并冷却到毫开尔文温度时，电子之间的强排斥性库仑相互作用迫使它们与穿过样品的基本通量量子结成联盟，以使相互作用能量最小化。电子和通量量子之间以相称的比例的强相关性导致复合费米子的形成和分数量子霍尔态的出现。除了传统的直流电磁输运之外，我们还将利用电子可压缩性、微波光电性和时间分辨输运等实验探针来研究单层和双层量子霍尔系统，试图进一步阐明这些相关效应。重点将放在解决复合费米子的能量色散的未解决的问题，并获得有关边缘低能激发的信息。

In high mobility two-dimensional electron systems, subjected to a strong perpendicular magnetic field and cooled down to millikelvin temperatures, the strong repulsive Coulomb interaction between the electrons forces them to make an alliance with the elementary flux quanta threading the sample in order to minimize the interaction energy. The strong correlation between electrons and flux quanta at commensurate ratios results in the formation of composite fermions and the appearance of fractional quantum Hall states. Experimental probes other than conventional dc-magnetotransport, such as the electronic compressibility, the microwave photoconductivity and the time-resolved transport, will be brought to bear on single and bilayer quantum Hall systems in an attempt to further clarify these correlation effects. Emphasis will be put on addressing unresolved issues about the energy dispersion of composite fermions and to obtain information about the low-energy excitations at the edges.