Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 5 of 5 for “"doped quantum wells"”.
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Carrier relaxation in doped quantum wells
The relaxation time of an electron in a quantum well is derived within the random-phase approximation including full multi-subband and frequency dependent screening. The resulting expression encompasses both electron-electron and electron-phonon scattering taking into account the mutual …
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Many-body effects in metals, modulation doped quantum wells and doped semiconductors
… valence hole, which is realized in modulation doped quantum wells or wires. In this case we approximately diagonalize the Hamiltonian by treating exactly the most important terms leading to nonperturbative behavior. The terms neglected are identified and can be treated in perturbation theory. …
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Design, fabrication, and characterization of high-speed light-emitting transistors and microcavity lasers
… bandwidth f-3dB = 7 GHz) by employing un-doped quantum wells in the highly-doped thin base region and allowing only “fast” recombining carriers to recombine through a reverse-biased base-collector junction boundary condition. A light-emitting transistor possesses, in addition, a unique …
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Optical characterisation of quantum well infrared photodetectors (QWIPs) for gas sensing applications
Although much work has been done on λ∼5-12 μm quantum well infrared photodetectors (QvWPs), the distinctive feature of this project is the use of strain compensated materials on InP substrates, AIAs (tensile) and InGaAs (compressive), to achieve shorter wavelengths and higher temperature operation. …