Abstract:This study looks at the three-level optical Stark effect of excitons in GaAs cylindrical quantum wires, utilizing the renormalized wave function theory. By applying the three-level model consisting of the first two electron levels connected via a powerful pump laser and the first hole level, we observe the appearance of the excitonic optical Stark effect through the appearance of two separated peaks in the exciton absorption spectra. In addition, the strong impact of the pump laser detuning and the wire radius… Show more
“…The Semiconductor quantum wires, one of the low-dimensional structures that possess many special properties, have drawn the attention of scientists These structures could be applied to great high-speed lasers quantum electron waveguides, resonant tunneling field effect transistors, or telecommunication network [7]. If the two dimensions of the material are reduced to Nano range while the third dimension remains large, then the material or structure is called quantum wire (QWR).…”
This study of semiconductor laser structure works on reducing the value of the threshold current density to improve the working conditions of the laser device. In this paper shown that the threshold current density and Optical confinement factor Г depends on Barrier width (B), and Number of well (Nw). We found any increase in Barrier width and Number of well is enhanced important parameters of diode laser such as threshold current density and confinement factor that's clearly for (Nw=2, B=40 nm) then (Г=0.175, ), while for (Nw=2, B=60 nm), that give results are (Г=0.195, ). On the other hand, when changing Nw=3, the results become for (B=40 nm and B=60 nm), as follows (Г=0.275, and (Г=0.295, respectively. This investigated contributed to calculating the efficiency and work of the laser device. We found the value of slope efficiency equal (45 %) and the external quantum efficiency ( 50 %).
“…The Semiconductor quantum wires, one of the low-dimensional structures that possess many special properties, have drawn the attention of scientists These structures could be applied to great high-speed lasers quantum electron waveguides, resonant tunneling field effect transistors, or telecommunication network [7]. If the two dimensions of the material are reduced to Nano range while the third dimension remains large, then the material or structure is called quantum wire (QWR).…”
This study of semiconductor laser structure works on reducing the value of the threshold current density to improve the working conditions of the laser device. In this paper shown that the threshold current density and Optical confinement factor Г depends on Barrier width (B), and Number of well (Nw). We found any increase in Barrier width and Number of well is enhanced important parameters of diode laser such as threshold current density and confinement factor that's clearly for (Nw=2, B=40 nm) then (Г=0.175, ), while for (Nw=2, B=60 nm), that give results are (Г=0.195, ). On the other hand, when changing Nw=3, the results become for (B=40 nm and B=60 nm), as follows (Г=0.275, and (Г=0.295, respectively. This investigated contributed to calculating the efficiency and work of the laser device. We found the value of slope efficiency equal (45 %) and the external quantum efficiency ( 50 %).
In this paper, we study the exciton absorption spectra in InGaAs prolate ellipsoidal quantum dots when a strong pump laser resonant with electron quantized levels is active. Our obtained results by renormalized wavefunction theory show that, under suitable conditions, the initial exciton absorption peak is split into two new peaks as the evidence of the existence of the three-level optical Stark effect of excitons. We have suggested an explanation of the origin of the effect as well as investigating the effect of pump field energy, size, and geometric shape of the quantum dots on effect characteristics. The comparison with the results obtained in the spherical quantum dots implies the important role of geometric shape of the quantum structures when we examine this effect.
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