Optical bistable switching in a hybrid magnetic semiconductor

A theoretical model is presented in this paper for degree of spin polarization in a light emitting diode (LED) whose epitaxial region contains quantum dots doped with magnetic impurity. The model is then used to investigate the effect of electron-phonon interaction on degree of spin polarization at different temperatures and magnetic fields. It is found that magnetic impurity increases the degree of spin polarization irrespective of temperature, while the electron-phonon interaction decreases the degree of spin polarization. Results are found to be in better agreement with experiments.

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“…The Hamiltonian for magnetic impurity is [9] H imp = xE e kμ e † kμ e kμ + xV e c c † kμ e kμ + e † kμ c kμ…”

Section: Modelmentioning

confidence: 99%

Spin polarization of electrons in a magnetic impurity doped semiconductor quantum dot – The effect of electron–phonon interaction

Misra

Tripathy

2015

Pramana - J Phys

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Optical bistability and absorption characteristic of an optomechanical system embedded with double quantum dot and nonlinear medium

et al. 2022

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Objective: This paper theoretically studies a hybrid optomechanical system embedded with two coupled quantum dots (CQDs) and a third-order Kerr nonlinear medium inside the cavity. The optical bistability and absorption spectrum are analyzed for the proposed system. Methods: From the Hamiltonian which describes the proposed system, a set of quantum Langevin equations are derived. Using these equations of motion, the steady-state mean field analysis is done which gives the phenomena of optical bistability. The performance of the optical switch is also analyzed in terms of gain and switching ratio. Further, the absorption spectrum of the system is derived and analyzed from the fluctuation dynamics. Results:The optical bistability has the potential to design tunable all-optical switches. The absorption spectra display peculiar characteristics of negative absorption (transparency dip). The transparency dips are found to be strongly dependent on the frequency of the mechanical resonator. The results of our investigation reveal that the proposed system can be used as an optical switch and has numerous other applications in quantum communication systems.

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A Model for Optical Bistability in a Hybrid Semiconductor Photonic Crystal Structure

Tripathy

Panigrahi

Hota

2009

IEEE Photon. Technol. Lett.

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Optical bistable switching in a hybrid magnetic semiconductor

Cited by 3 publications

References 6 publications

Spin polarization of electrons in a magnetic impurity doped semiconductor quantum dot – The effect of electron–phonon interaction

Spin polarization of electrons in a magnetic impurity doped semiconductor quantum dot – The effect of electron–phonon interaction

Optical bistability and absorption characteristic of an optomechanical system embedded with double quantum dot and nonlinear medium

A Model for Optical Bistability in a Hybrid Semiconductor Photonic Crystal Structure

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