Density-dependent exciton dynamics and L -valley anisotropy in germanium

M. Stein, C. Lammers, P. Springer, P. H. Richter, S. W. Koch, M. Koch, M. Kira

Research output: Contribution to journalArticlepeer-review

8 Scopus citations


Optical pump-THz probe spectroscopy is used to investigate the exciton formation dynamics and its intensity dependence in bulk Ge. Associated with the intraexcitonic 1s-2p transition, the gradual buildup of an absorption peak around 3.1 meV (0.75 THz) signifies a delayed exciton formation after optical pump which is accelerated for higher excitation densities. Analyzing the spectral shape of this THz absorption resonance, two distinct resonances are found which are attributed to the mass anisotropy of L-valley electrons via a microscopic theory.

Original languageEnglish (US)
Article number155207
JournalPhysical Review B
Issue number15
StatePublished - Apr 26 2017

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics


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