Exciton dynamics studied via internal THz transitions

Authors :: R. Lövenich
Daniel Hägele
M.A. Carnahan
Robert A. Kaindl
Daniel S. Chemla
Source :: Kaindl, R.A.; Hagele, D.; Carnahan, M.A.; Lovenich, R.; & Chemla, D.S.(2003). Exciton dynamics studied via internal THz transitions. Lawrence Berkeley National Laboratory. Lawrence Berkeley National Laboratory: Lawrence Berkeley National Laboratory. Retrieved from: http://www.escholarship.org/uc/item/6nm6761r
Publication Year :: 2003
Publisher :: Wiley, 2003.
Abstract: 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.