Abstract-Exciton ionization by THz pulses in germanium

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

http://iopscience.iop.org/article/10.1088/1361-6455/aabac7/meta

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–2pTHz 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–2ptransition energy.  

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