Direct Far-Infrared and Magneto-Transport Studies of the Two Dimensional Electron Gas

这项研究计划的目的是更深入地了解高质量调制掺杂半导体异质结中具有重要技术意义的二维电子气(2DEG)的磁性和红外特性。我们将利用低温和强磁场实验来探索分数量子霍尔效应(FQHE)的物理机制。利用棱镜耦合的方法研究了外加和不加磁场时的子带间跃迁的远红外(FIR)特性。它有望回答由于平行磁场而引起的子带间和回旋共振跃迁之间的耦合的基本问题。第二个推力涉及对独特的FQHE效应的多体性质以及平行磁场分量对FQHE状态的影响的磁输运研究。这些详细的调查将与FQHE的复杂理论进行比较。

This research program has the objective of achieving a deeper understanding of the magnetic and infrared properties of the technologically important two-dimensional electron gas (2DEG) in high quality, modulation-doped semiconductor heterojunctions. Experiments at low temperatures and high magnetic fields will be employed to probe the physics of the Fractional Quantum Hall Effect (FQHE). The far infrared (FIR) properties of the inter- subband transitions will be studied via prism coupling both with and without an external magnetic field. It is hoped to answer fundamental questions about the coupling between intersubband and cyclotron resonance transitions due to a parallel magnetic field. A second thrust involves magneto-transport studies of the many body nature of the unique FQHE effect and the effect of the parallel magnetic field component on the FQHE state. These detailed investigations will be compared with sophisticated theories of the FQHE.