Spectroscopy of Charged Donors and Many-Electron Effects in Semiconductor Quantum Wells

Breather mode in the many-electron dynamics of semiconductor quantum wells

Electron-spin beat susceptibility of excitons in semiconductor quantum wells.

Recent time-resolved differential transmission and Faraday rotation measurements of long-lived electron-spin coherence in quantum wells displayed intriguing parametric dependencies. For their understanding we formulate a microscopic theory of the optical response of a gas of optically incoherent excitons whose constituent electrons retain spin coherence, under a weak magnetic field applied in t...

Optical two-dimensional fourier transform spectroscopy of semiconductor quantum wells.

Coherent light-matter interactions of direct-gap semiconductor nanostructures provide a great test system for fundamental research into quantum electronics and many-body physics. The understanding gained from studying these interactions can facilitate the design of optoelectronic devices. Recently, we have used optical two-dimensional Fourier-transform spectroscopy to explore coherent light-mat...

Reflectance-based optically detected resonance studies of neutral and negatively charged donors in GaAsÕAlxGa1ÀxAs quantum wells

We report a reflectance-based optically detected resonance ~ODR! study of neutral and negatively charged donors in GaAs/AlxGa12xAs quantum-well structures. The intensity of the e1h1(1s) excitonic reflectance feature was modulated by resonant absorption of a monochromatic far-infrared ~FIR! laser beam. An externally applied magnetic field was used to bring the internal transitions among various ...

Probing many-particle correlations in semiconductor quantum wells using double-quantum-coherence signals.

Multidimensional analysis of coherent signals is commonly used in nuclear magnetic resonance to study correlations among spins. These techniques were recently extended to the femtosecond regime and applied to chemical, biological and semiconductor systems. In this work, we apply a two-dimensional correlation spectroscopy technique which employs double-quantum-coherence to investigate many-body ...