Title :
Coherent terahertz magneto-spectroscopy of ultrahigh-mobility two-dimensional electron gases
Author :
Qi Zhang ; Arikawa, Takashi ; Reno, John ; Wei Pan ; Watson, Jason ; Manfra, Michael ; Kono, Junichiro
Author_Institution :
Dept. of Electr. & Comput. Eng., Rice Univ., Houston, TX, USA
Abstract :
We study the coherent dynamics of cyclotron resonance (CR) in ultrahigh-mobility two-dimensional electron gases via time-domain terahertz magneto-spectroscopy. The CR decoherence time increases with decreasing temperature but saturates below 10 K. We observe an increase in both CR decoherence rate and CR mass when holes are created via optical pumping; the latter indicates a breakdown of Kohn´s theorem due to electron-hole Coulomb interactions.
Keywords :
cyclotron resonance; light coherence; magneto-optical effects; optical pumping; terahertz wave spectra; two-dimensional electron gas; Kohn theorem; coherent dynamics; coherent terahertz magneto-spectroscopy; cyclotron resonance decoherence rate; cyclotron resonance mass; electron-hole Coulomb interactions; optical pumping; time-domain terahertz magneto-spectroscopy; ultrahigh-mobility two-dimensional electron gas; Charge carrier processes; Cyclotrons; Magnetic fields; Magnetic resonance; Optical pumping; Saturation magnetization; Time-domain analysis;
Conference_Titel :
Lasers and Electro-Optics (CLEO), 2013 Conference on
Conference_Location :
San Jose, CA
