Introduction

Abstract

Charge carriers in modulation–doped semiconductor quantum systems are a field of enormous and still growing research interest since they allow, in specially tailored systems, the investigation of fundamental properties, such as many–particle interactions, of electrons in reduced dimensions. Over the past decades, the experimental investigation of interacting electrons in low dimensions has led to many new and sometimes unexpected insights into many–particle physics in general. Famous examples are unique electronic transport properties as the integer and fractional quantum–Hall effects in quasi two–dimensional (Q2D) systems. Quasi one–dimensional (Q1D) electron systems, realized in semiconductor quantum wires, have been the subject of intense theoretical and experimental debates concerning the character – Fermi–liquid or Luttinger–liquid – of the interacting Q1D quantum liquid. During the past few years, tunneling–coupled electronic double–layer structures have been revisited as very interesting candidates for the realization of new quantum phases in an interacting many–particle system. A new quality came into the physics of semiconductor nanostructures by the development of quantum systems, embedded in microresonators, also called microcavities. This new inventions allowed one to investigate the light–matter interaction from an advanced point of view.

Keywords

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