The research lines at NEST in the field of coherent nanoelectronics focus on the study of fundamental properties of low-dimensional systems in the quantum limit. Interference between edge channels in the quantum Hall regime (QHR), collective electronic excitations of semiconductor quantum dots and of samples in the QHR, tranport of charge carriers in piezoelectric semiconductors by means of surface acoustic waves (SAW), intersubband polaritons, and mesoscopic transport in hybrid normal-superconductor nanostructured junctions are some of the research highlights which will be presented in more detail in the following. Importantly, these results may soon find applications in various fields such as Terahertz quantum cascade lasers, SAW driven lab-on-a-chip technologies (see the corresponding research line on Nanobiotechnology), superconducting electron refrigeration, or solid-state quantum information processing. Most of the materials for these studies are synthesized in-house (semiconductor nanowires, high-mobility III-V heterostructures, graphene, and crystalline materials for optoelectronics and photonics) and processed in the clean room of NEST. The experimental techniques employed for these studies include optics (resonant light scattering, 50mK, 14T), magneto-transport measurements (10mK, 16T), and the recently installed scanning gate microscopy (300mK, 9T).

• Terahertz quantum cascade lasers - Activity report 2005/06 (PDF)
• Intersubband polaritronics - Activity report 2005/06 (PDF)
• Electronic excitations in low dimensional systems - Activity report 2005/06 (PDF)
• SAW-driven optoelectronic devices - Activity Report 2005/06 (PDF)
• Mesoscopic circuits in the quantum Hall regimes - Activity report 2005/06 (PDF)
• Mesoscopic transport in hybrid normal-superconductor nanostructures - Activity report 2005/06 (PDF)
• Quantum pumping in nanostructures - Activity report 2005/06 (PDF)
• Solid-state Quantum Information - Activity report 2005/06 (PDF)
• Quantum transport in semiconductor mesoscopic systems - Activity report 2005/06 (PDF)
• Electronic states of Si-Ge based heterostructures - Activity Report 2005/06 (PDF)
• Quantum information processing with spin - Activity Report 2005/06 (PDF)
• Geometric quantum computation - Activity Report 2005706 (PDF)
• New crystalline materials for optoelectronic application - Activity Report 2005/06 (PDF)