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AIP conference proceedings

Spontaneously generated coherence (SGC) in a three-level V-type multiple quantum well nanostructures

Rohit Hazra, Rohit Mukherjee, Nitu Borgohain

Published Jan 1, 2024• 1 citation
Publisher

Abstract

Coherent phenomena based on lasing without inversion (LWI), electromagnetically induced transparency (EIT) and enhanced index of refraction are due to the interaction of light with matter. Quite recently, the coherent phenomenon of spontaneously generated coherence (SGC) has emerged as a significant one in the study of several semiconductor nanostructures. In this article, we examine the linear optical properties in the EIT regime for a three-level V-type semiconductor quantum wells (QWs) in the presence of an incoherent pump field under the SGC effect. It is shown that for a suitable choice of a SGC parameter and an incoherent pump field, the linear absorption substantially changes into a probe field gain and at the same time modifies the dispersive properties of the medium.

DOI
10.1063/5.0216071

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In this paper, we investigate the effects of spontaneously generated coherence (SGC) on the conditions for exhibiting lasing without inversion (LWI) in the presence of a weak probe and a strong-coupling field. We find that owing to the effect of SGC, LWI can be realized without the incoherent pumping or the decay between two upper levels. However, in the region where LWI can be exhibited, the effect of SGC term on the exhibition of LWI is not always positive, sometimes it can even cumber the realization of LWI for some values of SGC. These values are given in this paper. In addition, we also analyze the essence of the generation of the probe field.

Physical Review A•Apr 19, 2004•57 citations
Coherent phenomena based on lasing without inversion (LWI), electromagnetically induced transparency (EIT) and enhanced index of refraction are due to the interaction of light with matter. Quite recently, the coherent phenomenon of spontaneously generated coherence (SGC) has emerged as a significant one in the study of several semiconductor nanostructures. In this article, we examine the linear optical properties in the EIT regime for a three-level V-type semiconductor quantum wells (QWs) in the presence of an incoherent pump field under the SGC effect. It is shown that for a suitable choice of a SGC parameter and an incoherent pump field, the linear absorption substantially changes into a probe field gain and at the same time modifies the dispersive properties of the medium.
This article presents a coherent phenomenon called spontaneously generated coherence (SGC) under the regime of electromagnetically induced transparency (EIT) in a three-coupled multiple quantum wells. We demonstrate that the presence of SGC in these quantum wells lead to intriguing modifications in the transparency window within the absorption spectrum. At the same time, modification of the dispersive nature is also demonstrated which enables the feasibility of the system in diverse applications based on light propagation. The absorption and dispersion responses are found to be varied by the individual strength of the first and second control fields in presence as well as in absence of SGC in the EIT regime. The positional shifting of the transparency window and simultaneous modifications in the dispersive profiles by tuning the control field detunings of both the first and second control fields are also revealed. Some absorption and dispersion contours are illustrated for getting better insights into the modifications of the optical responses via SGC. Finally, by manipulating the strength of the SGC parameter, we observe the changes in the respective position of the transparency window and dispersion curve. It is expected that the current investigations will pave novel ways for innovative applications in quantum communications, and fabrication of advanced photonic devices.
Abstract In this paper, we investigate the absorption and dispersion properties of a weak probe field in a triple quantum well nanostructure by using the incoherent pumping fields. A deep 7.1 nm-thick GaAs well is coupled, on one side, to two shallow 6.8 nm-thick Al 0.2 Ga 0.8 As wells by a 2.5 nm-thick Al 0.4 Ga 0.6 As barrier. The two shallow wells are separated by a 2.0 nm-thick Al 0.4 Ga 0.8 As barrier. Both sides of quantum well contact with 36 nm Al 0.4 Ga 0.6 As. Therefore, this type of triple quantum well nanostructure can be used as a suitable medium for studying the effect of spontaneously generated coherence (SGC) and interference between incoherent pumping fields on absorption and dispersion properties of weak probe light. We find that the interferences from spontaneous emission and incoherent pumping processes can change the slope of dispersion and group velocity of the probe light from slow to fast or vice versa. Moreover, it is demonstrated that the group velocity of the light pulse can be controlled with the rates of incoherent pumping fields.
The probe response and dispersion of a three-level closed ? system considering spontaneously generated coherence (SGC) have been investigated with and without an incoherent pumping. One can get electromagnetically induced transparency (EIT) whatever be the value of the SGC parameter and phase difference when an incoherent pump is absent. But by turning the incoherent pump rate on, one can control the light propagation from subluminal to superluminal and also the nonlinear response from EIT to electromagnetically induced absorption (EIA) by controlling the SGC parameter and phase difference. Using the incoherent pump rate as an optical tool, the desired configuration around the resonance can be realized. Exact analytical expressions for the coherences in the steady-state limit have been derived in the absence of an incoherent pump rate (keeping all orders of the system parameters) to generalize the analysis, and any restriction on the system parameters has been avoided to make it applicable to various atomic and molecular systems.
In this paper, we investigate the effects of spontaneously generated coherence (SGC) on the conditions for exhibiting lasing without inversion (LWI) in the presence of a weak probe and a strong-coupling field. We find that owing to the effect of SGC, LWI can be realized without the incoherent pumping or the decay between two upper levels. However, in the region where LWI can be exhibited, the effect of SGC term on the exhibition of LWI is not always positive, sometimes it can even cumber the realization of LWI for some values of SGC. These values are given in this paper. In addition, we also analyze the essence of the generation of the probe field.