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Summary form only given. The essence of the "strong correlation" problem is that interactions reduce the ability of electrons to move in a solid. Optical conductivity probes, over a wide range of time scales, the ability of electrons to move, and is therefore a key probe of correlated electron physics. One simple and robust feature of the conductivity is the "spectral weight,"...
Summary form only given. We use visible-infrared dual beam time-resolved spectroscopy to study the dynamics of carriers in optically pumped laser devices containing quantum heterostructures within their active layers. By tuning the probe energy through the intersubband absorption resonance, we directly measure the electron population in various momentum states within the first conduction subband of...
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