准二维电子空穴气体中瞬态导电和绝缘相的太赫兹探针

Infrared and Millimeter Waves, Conference Digest of the 2004 Joint 29th International Conference on 2004 and 12th International Conference on Terahertz Electronics, 2004. Pub Date : 2004-07-01 DOI:10.1109/ICIMW.2004.1422184

R. Kaindl, D. Hägele, M. Carnahan, R. Lovenich, D. Chemla

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引用次数: 1

摘要

我们利用超快太赫兹(THz)脉冲研究了GaAs/AlGaAs量子阱中光诱导激子和非束缚电子空穴对的动态相互作用。在重空穴激子的共振激发下，一个明显的低能振子出现，这与它们内部自由度之间的跃迁有关。太赫兹电导率的时间分辨变化，我们可以观察到在超短时间尺度上激子形成或电离时导电相和绝缘相之间的动态转变。

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Terahertz probes of transient conducting and insulating phases in quasi-2D electron-hole gases

We employ ultrafast terahertz (THz) pulses to study the dynamical interplay of optically-induced excitons and unbound electron-hole pairs in GaAs/AlGaAs quantum wells. A distinct low-energy oscillator appears upon resonant excitation of heavy-hole excitons, linked to transitions between their internal degrees of freedom. Time-resolving changes in the THz conductivity, we can observe dynamical transitions between conducting and insulating phases as excitons form or ionize on ultrashort timescales.

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来源期刊

Infrared and Millimeter Waves, Conference Digest of the 2004 Joint 29th International Conference on 2004 and 12th International Conference on Terahertz Electronics, 2004.

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