Semiconductor Spectroscopy

Head: Prof. Dr. Holger T. Grahn

This department investigates

• Elementary excitations (photons, electrons, and spins) and their control by surface acoustic waves (SAWs) using dedicated spectroscopic techniques
• Optical polarization properties of wide-gap group-III nitride films with nonpolar surfaces are examined using polarized transmission, reflectance, photoreflectance, and photoluminescence spectroscopy
  
• Design and optical as well as transport properties of quantum-cascade lasers using intersubband (mid- and far-infrared) and interband (near-infrared) spectroscopy
  
• Transport properties of ferromagnetic layers, in particular the planar and anomalous Hall effects, in high magnetic fields at low temperatures
  
• Spin-injection efficiency of ferromagnet-semiconductor hybrid structures, their magneto-optical properties, in particular the degree of circular polarization, using light-emitting diodes with a ferromagnetic layer on top
• Quantum transport of carriers and spins theoretically.