Terahertz Probes of Transient Conducting and Insulating Phases inQuasi-2D Electron-hole Gases

Conference · Thu Jul 01 00:00:00 EDT 2004

OSTI ID:882908

Kaindl, R A; Hagele, D; Carnahan, M A; Lovenich, R; Chemla, D S

We employ ultrafast terahertz (THz) pulses to study thedynamical interplay of optically-induced excitons and unboundelectron-hole pairs in GaAs/AlGaAs quantum wells. A distinct low-energyoscillator appears upon resonant excitation of heavy-hole excitons,linked to transitions between their internal degrees of freedom. Timeresolving changes in the THz conductivity, we can observe dynamicaltransitions between conducting and insulating phases as excitons form orionize on ultrashort timescales.

• Research Organization: Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
• Sponsoring Organization: USDOE Director. Office of Science. Office of Basic EnergySciences. Materials Science and Engineering Division; DeutscheForschungsgemeinschaft, Alexander von Humboldt Foundation
• DOE Contract Number: DE-AC02-05CH11231
• OSTI ID: 882908
• Report Number(s): LBNL-58464; R&D Project: 504901; BnR: KC0202020
• Resource Relation: Conference: 29th International conference on infrared andmillimeter waves and 12th International Conference on TerahertzElectronics (2004), Karlsruhe, Germany, Sept 27-Oct 1,2004
• Country of Publication: United States
• Language: English

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