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Density dependent exciton dynamics and L valley anisotropy in germanium
Markus Stein, Christian Lammers, Phillip Springer +4
Optical pump-THz probe spectroscopy is used to investigate the exciton formation dynamics and its intensity dependence in bulk Ge. Associated with the intra-excitonic 1s-2p transit…
Charge transfer states at the interface of the pentacene monolayer on TiO and their influence on the optical spectrum
M. P. Ljungberg, O. Vänskä, P. Koval +3
The full monolayer of pentacene adsorbed on rutile TiO(110) provides an intriguing model to study charge-transfer excitations where the optically excited electrons and holes re…
Gain spectroscopy of a type-II VECSEL chip
Christian Lammers, Markus Stein, Christian Berger +9
Using optical pump-white light probe spectroscopy the gain dynamics is investigated for a VECSEL chip which is based on a type-II heterostructure. The active region the chip consis…
Coherent cyclotron motion beyond Kohn's theorem
T. Maag, A. Bayer, S. Baierl +10
In solids, the high density of charged particles makes many-body interactions a pervasive principle governing optics and electronics[1-12]. However, Walter Kohn found in 1961 that…
Real-time observation of interfering crystal electrons in high-harmonic generation
M. Hohenleutner, F. Langer, O. Schubert +5
Accelerating and colliding particles has been a key strategy to explore the texture of matter. Strong lightwaves can control and recollide electronic wavepackets, generating high-h…
Sub-cycle control of terahertz high-harmonic generation by dynamical Bloch oscillations
O. Schubert, M. Hohenleutner, F. Langer +8
Ultrafast charge transport in strongly biased semiconductors is at the heart of highspeed electronics, electro-optics, and fundamental solid-state physics. Intense light pulses in…