Lawrence Berkeley National Laboratory
Exciton dynamics studied via internal THz transitions
- Author(s): Kaindl, R.A.
- Hagele, D.
- Carnahan, M.A.
- Lovenich, R.
- Chemla, D.S.
- et al.
We employ a novel, ultrafast terahertz probe to investigate the dynamical interplay of optically-induced excitons and unbound electron-hole pairs in GaAs quantum wells. Resonant creation of heavy-hole excitons induces a new low-energy oscillator linked to transitions between the internal exciton degrees of freedom. The time resolved terahertz optical conductivity is found to be a probe well suited for studies of fundamental processes such as formation, relaxation and ionization of excitons.