Exciton ionization by THz pulses in germanium

M. Stein, C. Lammers, J. T. Steiner, P. H. Richter, S. W. Koch, M. Koch, M. Kira

Research output: Contribution to journalArticlepeer-review

2 Scopus citations


After optical pumping, strong single cycle THz pulses are used to probe and manipulate excitons in bulk germanium. For strong THz fields a significant broadening and bleaching of the 1s-2p THz absorption peak is observed. The experimental results are analyzed using a microscopic many-body theory attributing the observations to a shortening of the excitonic state lifetime and eventual exciton ionization. Simultaneously, the ac THz Stark effect leads to a shift in the 1s-2p transition energy.

Original languageEnglish (US)
Article number154001
JournalJournal of Physics B: Atomic, Molecular and Optical Physics
Issue number15
StatePublished - Jul 9 2018
Externally publishedYes


  • THz spectroscopy
  • excitons
  • semiconductor physics

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics
  • Condensed Matter Physics


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