Giant AC Stark shift in germanium

  title={Giant AC Stark shift in germanium},
  author={Kolja Kolata and N. S. Koster and R. Woscholski and Christoph Lange and Sangam Chatterjee and Giovanni Isella and Daniel Chrastina and H. von Kanel},
  journal={CLEO: 2011 - Laser Science to Photonic Applications},
We observe a strong ultrafast AC Stark shift of the direct band transition in strained germanium quantum wells grown on silicon. At 150 meV, the maximum measured blue shift of the band edge is one order of magnitude larger than typically found in III-V materials. The power dependence shows a linear behavior between the electrical field intensity and the… CONTINUE READING