Condensed Matter Physics

Condensed Matter Physics
  • Theory: Electronic and vibrational properties of defects in semiconductors and insulators. (Fowler, Gunton, Rickman)
  • Experiment: Charge transport in insulators and semiconductors; nonlinear optical spectroscopy (Biaggio). Point defects in insulating materials with ferroelectric domain walls and other dopants; optical spectroscopy under application of hydrostatic pressure, and magnetic fields; carrier localization in wide band gap semiconductors (Dierolf). Quantum transport behavior of electrons, conduction in ultrasmall silicon MOSFETs and gallium-arsenide devices and carbon nanotubes at low temperature and high magnetic field (Licini). Defects in semiconductors. Current interest is in defect complexes that contain light-element impurities such as H, C, O, and N. Vibrational spectroscopy and uniaxial stress techniques are used to elucidate microscopic properties (Stavola). Raman and neutron scattering, dielectric and ultrasonic spectroscopies, collective vibrational dynamics of disordered ferroelectrics and glasses (Toulouse).