Topic
Quantum well
About: Quantum well is a research topic. Over the lifetime, 44627 publications have been published within this topic receiving 674023 citations. The topic is also known as: QW & quantum potential well.
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TL;DR: In this article, a (Zn,Cd)Se/ZnSe and Zn(S,Se) quantum well structures were used for laser diode operation.
Abstract: Laser diode operation has been obtained from (Zn,Cd)Se/ZnSe and (Zn,Cd)Se/Zn(S,Se) quantum well structures in the blue and the green. The devices, prepared on p‐ and n‐type (In,Ga)As or GaAs buffer layers for lattice matching purposes to control the defect density, have been operated at near‐room‐temperature conditions and briefly at room temperature with uncoated end facets. Quasi‐continuous wave operation has been obtained at T=77 K.
165 citations
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TL;DR: In this paper, an effective mass theory for quantum well was proposed, with an emphasis on calculating the valley splitting, based on a tight binding theory, and the resulting formalism provides rather simple analytical results for several geometries of interest.
Abstract: We present an effective mass theory for $\mathrm{Si}\mathrm{Ge}∕\mathrm{Si}∕\mathrm{Si}\mathrm{Ge}$ quantum wells, with an emphasis on calculating the valley splitting. The theory introduces a valley coupling parameter ${v}_{v}$ which encapsulates the physics of the quantum well interface. The new effective mass parameter is computed by means of a tight binding theory. The resulting formalism provides rather simple analytical results for several geometries of interest, including a finite square well, a quantum well in an electric field, and a modulation doped two-dimensional electron gas. Of particular importance is the problem of a quantum well in a magnetic field, grown on a miscut substrate. The latter may pose a numerical challenge for atomistic techniques such as tight binding, because of its two-dimensional nature. In the effective mass theory, however, the results are straightforward and analytical. We compare our effective mass results with those of the tight binding theory, obtaining excellent agreement.
164 citations
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TL;DR: In this article, the authors investigated the effective mass (m*e) in GaNxAs1-x/GaAs quantum wells (QWs) by the optically detected cyclotron resonance technique.
Abstract: Electron effective mass (m*e) in GaNxAs1-x/GaAs quantum wells (QWs) is investigated by the optically detected cyclotron resonance technique. The m*e values of 0.12m0 and 0.19m0 are directly determi ...
163 citations
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TL;DR: The long duration of spin orientation is used to demonstrate deep transient oscillations, resulting from biexcitonic effects, of exciton spin relaxation in GaAs quantum wells in moderate magnetic fields.
Abstract: We report the experimental observation of exciton spin relaxation in GaAs quantum wells in moderate magnetic fields. We resolve the electron and hole contributions and discuss the large sensitivity of the spin-relaxation time to exciton localization and quantum well width. We use the long duration of spin orientation to demonstrate deep transient oscillations, resulting from biexcitonic effects
163 citations
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TL;DR: It is confirmed that a perfect WPQW absorbs light only at the bare harmonic-oscillator frequency, and it is shown that the effects of small imperfections of the types considered on the absorption spectrum are twofold: a shift in the location of the main peak and the appearance of new peaks nearby.
Abstract: The effects of possible imperfections on the infrared optical absorption and on the charge-density profile of wide parabolic quantum wells (WPQW's) are studied. We consider effects that can arise from the finite width of WPQW's, from the existence of a quartic component in the confining potential, and from the existence of a region of flat potential in the center of the well. Within the local-density approximation, we confirm that a perfect WPQW absorbs light only at the bare harmonic-oscillator frequency, and show that the effects of small imperfections of the types considered on the absorption spectrum are twofold: a shift in the location of the main peak and the appearance of new peaks nearby.
163 citations